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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Dec. 31, 2012	Jan. 31, 2013
Document and Entity Information [Abstract]
Entity Registrant Name	GSI TECHNOLOGY INC
Entity Central Index Key	0001126741
Current Fiscal Year End Date	--03-31
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Dec. 31, 2012
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		27,016,725

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Dec. 31, 2012	Mar. 31, 2012
ASSETS
Cash and cash equivalents	$ 32,596	$ 31,634
Short-term investments	33,053	27,044
Accounts receivable, net	8,662	10,579
Inventories	15,188	16,725
Prepaid expenses and other current assets	6,812	8,108
Deferred income taxes	1,034	1,097
Total current assets	97,345	95,187
Property and equipment, net	11,224	12,806
Long-term investments	31,627	33,497
Other assets	1,857	1,627
Total assets	142,053	143,117
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable	3,721	5,490
Accrued expenses and other liabilities	3,387	4,343
Deferred revenue	2,469	2,670
Total current liabilities	9,577	12,503
Income taxes payable	2,111	1,835
Total liabilities	11,688	14,338
Commitments and Contingencies (Note 6)
Stockholders’ equity:
Preferred stock: $0.001 par value authorized: 5,000,000 shares; issued and outstanding: none	0	0
Common stock: $0.001 par value authorized: 150,000,000 shares; issued and outstanding: 26,991,600 and 27,617,942 shares, respectively	27	28
Additional paid-in capital	53,139	54,402
Accumulated other comprehensive income	42	88
Retained earnings	77,157	74,261
Total stockholders’ equity	130,365	128,779
Total liabilities and stockholders’ equity	$ 142,053	$ 143,117

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Dec. 31, 2012	Mar. 31, 2012
Stockholders' Equity:
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	26,991,600	27,617,942
Common stock, shares outstanding	26,991,600	27,617,942

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]
Net revenues	$ 17,514	$ 19,975	$ 50,307	$ 63,806
Cost of revenues	10,170	11,208	28,994	35,804
Gross profit	7,344	8,767	21,313	28,002
Operating expenses:
Research and development	2,858	2,627	8,568	7,964
Selling, general and administrative	3,891	5,453	9,764	13,299
Total operating expenses	6,749	8,080	18,332	21,263
Income from operations	595	687	2,981	6,739
Interest income, net	117	139	348	409
Other income (expense), net	(8)	18	28	(7)
Income before income taxes	704	844	3,357	7,141
Provision (benefit) for income taxes	(140)	(147)	461	1,214
Net income	$ 844	$ 991	$ 2,896	$ 5,927
Net income per share:
Basic	$ 0.03	$ 0.03	$ 0.11	$ 0.21
Diluted	$ 0.03	$ 0.03	$ 0.10	$ 0.20
Weighted average shares used in per share calculations:
Basic	26,963	28,504	27,152	28,713
Diluted	27,987	29,189	27,957	29,861

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Net income	$ 844	$ 991	$ 2,896	$ 5,927
Net unrealized gain (loss) on available-for-sale investments, net of tax	(38)	(51)	(46)	(20)
Comprehensive net income	$ 806	$ 940	$ 2,850	$ 5,907

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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Reference 16: http://www.xbrl.org/2003/role/presentationRef
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-Article 9

+ Details

- Definition

Net of tax amount of unrealized holding gain (loss) before reclassification adjustments and transfers on available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net income	$ 2,896	$ 5,927
Adjustments to reconcile net income to net cash provided by operating activities:
Allowance for sales returns and doubtful accounts	0	31
Provision for excess and obsolete inventories	544	640
Depreciation and amortization	1,847	2,005
Stock-based compensation	1,688	1,557
Deferred income taxes	63	257
Windfall tax benefits from stock options exercised	(20)	(74)
Amortization of bond premium on investments	792	948
Changes in assets and liabilities:
Accounts receivable	1,917	6,698
Inventory	993	216
Prepaid expenses and other assets	941	(2,584)
Accounts payable	(1,730)	(2,495)
Accrued expenses and other liabilities	(516)	(470)
Deferred revenue	(201)	(1,403)
Net cash provided by operating activities	9,214	11,253
Cash flows from investing activities:
Purchase of investments	(27,660)	(30,317)
Proceeds from sales and maturities of investments	22,673	26,121
Purchases of property and equipment	(313)	(736)
Net cash used by investing activities	(5,300)	(4,932)
Cash flows from financing activities:
Repurchase of common stock	(3,626)	(4,471)
Windfall tax benefits from stock options exercised	20	74
Proceeds from issuance of common stock under employee stock plans	654	1,497
Net cash used by financing activities	(2,952)	(2,900)
Net increase in cash and cash equivalents	962	3,421
Cash and cash equivalents at beginning of the period	31,634	25,952
Cash and cash equivalents at end of the period	32,596	29,373
Non-cash financing activities:
Purchases of property and equipment through accounts payable and accruals	91	259
Supplemental cash flow information:
Cash paid for income taxes	$ 359	$ 3,163

The Company and Summary of Significant Accounting Policies	9 Months Ended
	Dec. 31, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]
The Company and Summary of Significant Accounting Policies	THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of presentation The accompanying unaudited condensed consolidated financial statements of GSI Technology, Inc. and its subsidiaries (“GSI” or the “Company”) have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") and pursuant to the instructions to Form 10-Q and Article 10 of Regulation S-X of the Securities and Exchange Commission. Accordingly, the interim financial statements do not include all of the information and footnotes required by generally accepted accounting principles for annual financial statements. These interim financial statements contain all adjustments (which consist of only normal, recurring adjustments) that are, in the opinion of management, necessary to state fairly the interim financial information included therein. The Company believes that the disclosures are adequate to make the information not misleading. However, these financial statements should be read in conjunction with the audited consolidated financial statements and related notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended March 31, 2012. The consolidated results of operations for the three months and nine months ended December 31, 2012 are not necessarily indicative of the results to be expected for the entire fiscal year. Significant accounting policies The Company’s significant accounting policies are disclosed in the Company’s Annual Report on Form 10-K for the fiscal year ended March 31, 2012. Litigation and settlement costs From time to time, the Company is involved in legal actions. The Company currently is a party to pending legal proceedings which it is defending aggressively. See Note 6 for additional information regarding this pending litigation. There are many uncertainties associated with any litigation, and the Company may not prevail. The litigation, regardless of its eventual outcome, will be costly and time consuming and, should the outcome be adverse to the Company, could result in the Company being required to pay significant monetary damages. If that occurs, our business, financial condition and results of operations could be materially and adversely affected. If information becomes available that causes us to determine that a loss in any of our pending litigation, or the settlement of such litigation, is probable, and we can reasonably estimate the loss associated with such events, we will record the loss in accordance with GAAP. However, the actual liability in any such litigation may be materially different from our estimates, which could require us to record additional costs. Recent accounting pronouncements In June 2011, the Financial Accounting Standards Board ("FASB") amended its guidance on the presentation of comprehensive income. Under the amended guidance, an entity has the option to present comprehensive income in either one continuous statement or two consecutive financial statements. A single statement must present the components of net income and total net income, the components of other comprehensive income and total other comprehensive income, and a total for comprehensive income. In a two-statement approach, an entity must present the components of net income and total net income in the first statement. That statement must be immediately followed by a financial statement that presents the components of other comprehensive income, a total for other comprehensive income, and a total for comprehensive income. The entity is also required to present on the face of its financial statements reclassification adjustments for items that are reclassified from other comprehensive income to net income in the statement(s) where the components of net income and the components of other comprehensive income are presented. The option under previous guidance that permitted the presentation of components of other comprehensive income as part of the statement of changes in stockholders' equity has been eliminated. In December 2011, the FASB further amended its guidance to defer changes related to the presentation of reclassification adjustments indefinitely as a result of concerns raised by stakeholders that the new presentation requirements would be difficult for preparers and add unnecessary complexity to financial statements. The amendment (other than the portion regarding the presentation of reclassification adjustments which, as noted above, has been deferred indefinitely) was effective during the quarter ended June 30, 2012. The amendment impacted the presentation of the consolidated financial statements but did not impact the Company's financial position, results of operations or cash flows.

- Definition

The entire disclosure for the organization, consolidation and basis of presentation of financial statements disclosure, and significant accounting policies of the reporting entity. May be provided in more than one note to the financial statements, as long as users are provided with an understanding of (1) the significant judgments and assumptions made by an enterprise in determining whether it must consolidate a VIE and/or disclose information about its involvement with a VIE, (2) the nature of restrictions on a consolidated VIE's assets reported by an enterprise in its statement of financial position, including the carrying amounts of such assets, (3) the nature of, and changes in, the risks associated with an enterprise's involvement with the VIE, and (4) how an enterprise's involvement with the VIE affects the enterprise's financial position, financial performance, and cash flows. Describes procedure if disclosures are provided in more than one note to the financial statements.

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Net Income Per Common Share

9 Months Ended

Dec. 31, 2012

Earnings Per Share [Abstract]

Net Income Per Common Share

NET INCOME PER COMMON SHARE

The Company uses the treasury stock method to calculate the weighted average shares used in computing diluted net income per share. The following table sets forth the computation of basic and diluted net income per share:



	Three Months Ended December 31,				Nine Months Ended December 31,
	2012		2011		2012		2011
	(In thousands, except per share amounts)
Net income	$	844	$	991	$	2,896	$	5,927
Denominators:
Weighted average shares—Basic	26,963		28,504		27,152		28,713
Dilutive effect of employee stock options	1,024		685		805		1,148
Dilutive effect of employee stock purchase plan options	—		—		—		—
Weighted average shares—Dilutive	27,987		29,189		27,957		29,861
Net income per share—Basic	$	0.03	$	0.03	$	0.11	$	0.21
Net income per share—Diluted	$	0.03	$	0.03	$	0.10	$	0.20

The following shares of common stock underlying outstanding stock options, determined on a weighted average basis, were excluded from the computation of diluted net income per share as they had an anti-dilutive effect:



	Three Months Ended December 31,		Nine Months Ended December 31,
	2012	2011	2012	2011
	(In thousands)
Stock options	3,243	2,640	3,130	1,140

Balance Sheet Detail

9 Months Ended

Dec. 31, 2012

BALANCE SHEET DETAIL [Abstract]

Balance Sheet Detail

BALANCE SHEET DETAIL



	December 31, 2012		March 31, 2012
	(In thousands)
Inventories:
Work-in-progress	$	5,072	$	6,163
Finished goods	9,443		9,832
Inventory at distributors	673		730
	$	15,188	$	16,725



	December 31, 2012			March 31, 2012
	(In thousands)
Accounts receivable, net:
Accounts receivable	$	8,762		$	10,679
Less: Allowances for sales returns, doubtful accounts and other	(100		)	(100		)
	$	8,662		$	10,579



	December 31, 2012		March 31, 2012
	(In thousands)
Prepaid expenses and other current assets:
Prepaid tooling and masks	$	1,296	$	2,310
Prepaid income taxes	3,958		4,287
Other receivables	629		608
Other prepaid expenses	929		903
	$	6,812	$	8,108



	December 31, 2012			March 31, 2012
	(In thousands)
Property and equipment, net:
Computer and other equipment	$	16,312		$	16,235
Software	4,690			4,497
Land	3,900			3,900
Building and building improvements	2,256			2,256
Furniture and fixtures	110			110
Leasehold improvements	767			762
Construction in progress	51			201
	28,086			27,961
Less: Accumulated depreciation and amortization	(16,862		)	(15,155		)
	$	11,224		$	12,806

Depreciation and amortization expense was $531,000 and $541,000, respectively, for the three months ended December 31, 2012 and 2011 and $1,712,000 and $1,870,000, respectively, for the nine months ended December 31, 2012 and 2011.



	December 31, 2012		March 31, 2012
	(In thousands)
Other assets:
Non-current deferred income taxes	$	985	$	619
Intangibles, net	789		925
Deposits	83		83
	$	1,857	$	1,627

The following table summarizes the components of intangible assets and related accumulated amortization balances at December 31, 2012 (in thousands):



	Life in Years	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Intangible assets:
Product designs	7	$	590	$	281	$	309
Patents	9	720		267		453
Software	5	80		53		27
		$	1,390	$	601	$	789

Amortization of intangible assets included in cost of revenues was $45,000 and $45,000, respectively, for the three months ended December 31, 2012 and 2011and $135,000 and $135,000, respectively, for the nine months ended December 31, 2012 and 2011.



	December 31, 2012		March 31, 2012
	(In thousands)
Accrued expenses and other liabilities:
Accrued compensation	$	2,011	$	1,636
Accrued professional fees	275		1,233
Accrued commissions	341		332
Accrued royalties	17		24
Accrued income taxes	—		203
Accrued equipment and software costs	71		131
Other accrued expenses	672		784
	$	3,387	$	4,343

Income Taxes	9 Months Ended
Income Taxes	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES The current portion of the Company’s unrecognized tax benefits at December 31, 2012 and March 31, 2012 was $0 and $599,000, respectively. The long-term portion at December 31, 2012 and March 31, 2012 was $2,111,000 and $1,835,000, respectively, of which the timing of the resolution is uncertain. As of December 31, 2012, $623,000 of unrecognized tax benefits had been recorded as a reduction to net deferred tax assets. The unrecognized tax benefit balance as of December 31, 2012 of $2,589,000 would affect the Company’s effective tax rate if recognized. It is possible, however, that some months or years may elapse before an uncertain position for which the Company has established a reserve is resolved. Management believes that it is reasonably possible that within the next twelve months the Company could have a reduction in uncertain tax benefits of up to $582,000, including interest and penalties, related to positions taken with respect to credits and loss carryforwards on previously filed tax returns. The Company’s policy is to include interest and penalties related to unrecognized tax benefits within the provision for income taxes in the Condensed Consolidated Statements of Operations. The Company is subject to taxation in the United States and various state and foreign jurisdictions. Fiscal years 2009 through 2012 remain open to examination by federal and most state tax authorities. In the three months ended June 30, 2012, the Company settled an examination by the California Franchise Tax Board. The tax provision for the nine month period ended December 31, 2012 includes a discrete benefit of $168,000 associated with the net result of the settlement and the associated tax reserves, including interest to date. The Company’s estimated annual effective income tax rate was approximately 26.1% and 19.5% as of December 31, 2012 and 2011, respectively. The differences between the effective income tax rate and the applicable statutory U.S. income tax rate in each period were primarily due to the effects of the expiration of federal R&D credits, foreign tax rate differentials and tax free interest income, offset by stock-based compensation expense. On January 2, 2013, federal R & D credits were extended retroactively from January 1, 2012, resulting in a benefit of $480,000 that will be recorded in the results of operations for the three months ending March 31, 2013.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Article 4

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-Number 109
-Paragraph 43, 44, 45, 46, 47, 48, 49
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Financial Instruments

9 Months Ended

Dec. 31, 2012

Fair Value Disclosures [Abstract]

Financial Instruments

FINANCIAL INSTRUMENTS

Fair value measurements

Authoritative accounting guidance for fair value measurements provides a framework for measuring fair value and related disclosure. The guidance applies to all financial assets and financial liabilities that are measured on a recurring basis. The guidance requires fair value measurement to be classified and disclosed in one of the following three categories:

Level 1: Valuations based on quoted prices in active markets for identical assets and liabilities. The fair value of available-for-sale securities included in the Level 1 category is based on quoted prices that are readily and regularly available in an active market. As of December 31, 2012, the Level 1 category included money market funds of $6.2 million, which were included in cash and cash equivalents in the Condensed Consolidated Balance Sheet.

Level 2: Valuations based on observable inputs (other than Level 1 prices), such as quoted prices for similar assets at the measurement date; quoted prices in markets that are not active; or other inputs that are observable, either directly or indirectly. The fair value of available-for-sale securities included in the Level 2 category is based on the market values obtained from an independent pricing service that were evaluated using pricing models that vary by asset class and may incorporate available trade, bid and other market information and price quotes from well established independent pricing vendors and broker-dealers. As of December 31, 2012, the Level 2 category included short-term investments of $33.1 million and long-term investments of $31.6 million, which were comprised of certificates of deposit, corporate debt securities and government and agency securities.

Level 3: Valuations based on inputs that are unobservable and involve management judgment and the reporting entity’s own assumptions about market participants and pricing. As of December 31, 2012, the Company had no Level 3 financial assets measured at fair value in the Condensed Consolidated Balance Sheet.

The fair value of financial assets and liabilities measured on a recurring basis is as follows (in thousands):



			Fair Value Measurement at Reporting Date Using
			Quoted Prices in Active Markets for Identical Assets or Liabilities		Significant Other Observable Inputs		Significant Unobservable Inputs
	December 31, 2012		(Level 1)		(Level 2)		(Level 3)
Assets:
Money market funds	$	6,246	$	6,246	$	—	$	—
Marketable securities	64,680		—		64,680		—
Total	$	70,926	$	6,246	$	64,680	$	—



			Fair Value Measurement at Reporting Date Using
			Quoted Prices in Active Markets for Identical Assets or Liabilities		Significant Other Observable Inputs		Significant Unobservable Inputs
	March 31, 2012		(Level 1)		(Level 2)		(Level 3)
Assets:
Money market funds	$	11,275	$	11,275	$	—	$	—
Marketable securities	60,541		—		60,541		—
Total	$	71,816	$	11,275	$	60,541	$	—

Short-term and long-term investments

All of the Company’s short-term and long-term investments are classified as available-for-sale. Available-for-sale debt securities with maturities greater than twelve months are classified as long-term investments when they are not intended for use in current operations. Investments in available-for-sale securities are reported at fair value with unrecognized gains (losses), net of tax, as a component of accumulated other comprehensive income in the Condensed Consolidated Balance Sheets. The Company had money market funds of $6.2 million and $11.3 million at December 31, 2012 and March 31, 2012, respectively, included in cash and cash equivalents in the Condensed Consolidated Balance Sheet. The Company monitors its investments for impairment periodically and records appropriate reductions in carrying values when declines are determined to be other-than-temporary.

The following table summarizes the Company’s available-for-sale investments:



	December 31, 2012
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
Short-term investments:
State and municipal obligations	$	13,941	$	9	$	—		$	13,950
Corporate notes	8,088		23		—			8,111
Certificates of deposit	10,975		17		—			10,992
Total short-term investments	$	33,004	$	49	$	—		$	33,053
Long-term investments:
State and municipal obligations	$	11,124	$	8	$	—		$	11,132
Corporate notes	8,448		4		—			8,452
Certificates of deposit	5,998		19		—			6,017
Other	6,050		—		(24		)	6,026
Total long-term investments	$	31,620	$	31	$	(24	)	$	31,627



	March 31, 2012
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
Short-term investments:
State and municipal obligations	$	14,261	$	18	$	—		$	14,279
Corporate notes	3,037		4		—			3,041
Certificates of deposit	9,705		19		—			9,724
Total short-term investments	$	27,003	$	41	$	—		$	27,044
Long-term investments:
State and municipal obligations	$	15,992	$	26	$	—		$	16,018
Corporate notes	6,201		11		—			6,212
Certificates of deposit	8,473		52		—			8,525
Other	2,758		—		(16		)	2,742
Total long-term investments	$	33,424	$	89	$	(16	)	$	33,497

The Company’s investment portfolio consists of both corporate and governmental securities that have a maximum maturity of three years. All unrealized gains are due to changes in interest rates and bond yields. Subject to normal credit risks, the Company has the ability to realize the full value of all these investments upon maturity.

As of December 31, 2012 and March 31, 2012, the deferred tax liability related to unrecognized gains and losses on short-term and long-term investments was $14,000 and $26,000, respectively.

As of December 31, 2012, contractual maturities of the Company’s available-for-sale non-equity investments were as follows:



	Cost		Fair Value
	(In thousands)
Maturing within one year	$	33,004	$	33,053
Maturing in one to three years	31,620		31,627
	$	64,624	$	64,680

The Company classifies its short-term investments as “available-for-sale” as they are intended to be available for use in current operations.

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES Indemnification obligations The Company is a party to a variety of agreements pursuant to which it may be obligated to indemnify the other party with respect to certain matters. Typically, these obligations arise in the context of contracts entered into by the Company, under which the Company agrees to hold the other party harmless against losses arising from a breach of representations and covenants related to such matters as title to assets sold and certain intellectual property rights. In each of these circumstances, the Company's indemnification obligations are conditioned on the other party making a claim pursuant to the procedures specified in the particular contract, which procedures typically allow the Company to challenge the other party’s claims. Further, the Company’s obligations under these agreements may be limited in terms of time and/or amount, and in some instances, the Company may have recourse against third parties for certain payments made by it under these agreements. It is not possible to predict the maximum potential amount of future payments that may be required under these or similar agreements due to the conditional nature of the Company’s obligations and the unique facts and circumstances involved in each particular agreement. Historically, payments made by the Company under these agreements have not had a material effect on its business, financial condition, cash flows or results of operations. Product warranties The Company warrants its products to be free of defects generally for a period of three years. The Company estimates its warranty costs based on historical warranty claim experience and includes such costs in cost of revenues. Warranty costs were not significant for the three months or nine months ended December 31, 2012 or 2011. Legal proceedings In March 2011, Cypress Semiconductor Corporation, a semiconductor manufacturer, filed a lawsuit against the Company in the United States District Court for the District of Minnesota alleging that the Company's products, including its SigmaDDR and SigmaQuad families of Very Fast SRAMs, infringe five patents held by Cypress. The complaint seeks unspecified damages for past infringement and a permanent injunction against future infringement. On June 10, 2011, Cypress filed a complaint against the Company with the United States International Trade Commission (the “ITC”). The ITC complaint, as subsequently amended, alleges infringement by the Company of three of the five patents involved in the District Court case and one additional patent and also alleges infringement by three of our distributors and 11 of our customers who allegedly incorporate our SRAMs in their products. The ITC complaint seeks a limited exclusion order excluding the allegedly infringing SRAMs, and products containing them, from entry into the United States and permanent orders directing the Company and the other respondents to cease and desist from selling or distributing such products in the United States. On July 21, 2011, the ITC formally instituted an investigation in response to Cypress's complaint. Two of the distributor-respondents and ten of the customer-respondents were subsequently dismissed from the investigation. The evidentiary hearing took place during the week of March 12, 2012. On October 25, 2012, Chief Administrative Law Judge Charles E. Bullock issued his initial determination in which he held that the importation of the Company's SRAM products, and products containing them, and the sale within the United States of such products, have not violated applicable federal law with respect to any of the four patents that Cypress had alleged were infringed. Because he found that the accused products do not infringe any of the asserted patent claims, Judge Bullock did not consider or rule on the additional arguments of GSI and the other respondents that the Cypress patents are invalid and unenforceable. On November 7, 2012, Cypress filed a petition for review of the initial determination by the full Commission, and GSI and the other respondents filed a contingent petition for review seeking a ruling on the invalidity and unenforceability arguments as well as additional bases for finding non-infringement. In a notice issued on December 21, 2012, the ITC announced that it had determined to review Judge Bullock's initial determination, but also remanded the investigation to Judge Bullock to consider and rule on the invalidity and enforceability issues in advance of the ITC review. The target date for concluding the ITC investigation is June 25, 2013. The District Court case has been stayed pending the conclusion of the ITC proceeding. The Company believes that Judge Bullock's initial determination was correct and intends to continue to defend itself vigorously in both proceedings. However, the litigation process is inherently uncertain, and the Company may not prevail. Patent litigation is particularly complex and can extend for a protracted period of time, which can substantially increase the cost of such litigation. The Company has not recorded any loss contingency during fiscal 2011 or fiscal 2012 in connection with these legal proceedings as the Company cannot predict their outcome and cannot estimate the likelihood or potential dollar amount of any adverse results. However, an unfavorable outcome in these proceedings could have a material adverse impact on the Company's financial position, results of operations or cash flows for the period in which the outcome occurs and in future periods.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6449706&loc=d3e16207-108621

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25287-109308

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 14
-Paragraph 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Stock-Based Compensation

9 Months Ended

Dec. 31, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock Option Plans

STOCK-BASED COMPENSATION

As of December 31, 2012, 5,009,581 shares of common stock were available for grant under the Company’s 2007 Equity Incentive Plan.

The following table summarizes the Company’s stock option activities for the nine months ended December 31, 2012:



	Number of Shares Underlying Outstanding Options		Weighted Average Remaining Contractual Life (Years)	Weighted Average Exercise Price		Intrinsic Value
Options outstanding as of March 31, 2012:	5,626,148			$	4.64
Granted	768,443			$	4.78
Exercised	(50,123	)		$	3.42	$	81,815
Forfeited	(76,663	)		$	4.68
Options outstanding as of December 31, 2012	6,267,805		6.15	$	4.67	$	10,776,890
Options exercisable as of December 31, 2012	3,775,060		4.71	$	4.21	$	7,990,611
Options vested and expected to vest	6,206,936		6.12	$	4.66	$	10,716,433

The weighted average fair value per underlying share of options granted during the three months ended December 31, 2012 and 2011 was $2.43 and $2.24, respectively, and for the nine months ended December 31, 2012 and 2011 was $2.12 and $2.73, respectively.

Options outstanding by exercise price at December 31, 2012 were as follows:



	Options Outstanding
					Options Exercisable
Exercise Price	Number of Shares Underlying Outstanding Options	Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (Years)	Number of Shares Underlying Vested and Exercisable Options	Weighted Average Exercise Price
$2.10 – 2.49	677,585	$	2.23	2.54	677,585	$	2.23
$2.83 – 3.43	838,586	$	3.34	6.16	597,849	$	3.31
$3.50 – 3.94	287,327	$	3.68	3.81	287,327	$	3.68
$4.00	727,288	$	4.00	6.43	537,171	$	4.00
$4.17 – 4.43	634,745	$	4.23	7.43	260,185	$	4.27
$4.50 – 4.92	638,623	$	4.82	8.34	148,639	$	4.68
$5.50	883,208	$	5.50	3.88	883,208	$	5.50
$5.59 - 6.28	805,990	$	5.91	7.71	200,084	$	5.86
$6.54 - 7.00	630,833	$	6.76	7.98	141,202	$	6.85
$9.20	143,620	$	9.20	8.08	41,810	$	9.20
	6,267,805	$	4.67		3,775,060

The following table summarizes stock-based compensation expense by line item in the Condensed Consolidated Statements of Operations, all relating to employee stock plans:



	Three Months Ended December 31,				Nine Months Ended December 31,
	2012		2011		2012		2011

Cost of revenues	$	68	$	79	$	245	$	237
Research and development	287		275		861		787
Selling, general and administrative	210		178		582		533
Total	$	565	$	532	$	1,688	$	1,557

As stock-based compensation expense recognized in the Condensed Consolidated Statement of Operations is based on awards ultimately expected to vest, it has been reduced for estimated forfeitures in accordance with authoritative guidance. The Company estimates forfeitures at the time of grant and revises the original estimates, if necessary, in subsequent periods if actual forfeitures differ from those estimates.

The Company recognized related income tax benefits of $51,000 and $54,000, respectively, for the three months ended December 31, 2012 and 2011and $167,000 and $175,000, respectively, for the nine months ended December 31, 2012 and 2011. Windfall tax benefits realized from exercised stock options were $14,000 and $16,000, respectively, for the three months ended December 31, 2012 and 2011, and $20,000 and $74,000, respectively, for the nine months ended December 31, 2012 and 2011. Compensation cost capitalized within inventory at December 31, 2012 was insignificant. As of December 31, 2012, the Company’s total unrecognized compensation cost was $4.0 million, which will be recognized over a weighted average period of 2.05 years. The Company calculated the fair value of stock-based awards in the periods presented using the Black-Scholes option pricing model and the following weighted average assumptions:



	Three Months Ended December 31,				Nine Months Ended December 31,
	2012		2011		2012	2011
Stock Option Plans:
Risk-free interest rate	0.69	%	0.96	%	0.67 - 0.79%	0.96 - 1.89%
Expected life (in years)	5.00		5.00		5.00	5.00
Volatility	50.2	%	52.7	%	50.2 - 52.9%	50.8 - 52.7%
Dividend yield	—		—		—	—
Employee Stock Purchase Plan:
Risk-free interest rate	0.14	%	0.05	%	0.14 - 0.15%	0.05 - 0.07%
Expected life (in years)	0.50		0.50		0.50	0.50
Volatility	47.3	%	43.9	%	23.4 - 47.3%	43.9 - 52.1%
Dividend yield	—		—		—	—

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64, 65, A240
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 93-6
-Paragraph 53
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Segment and Geographic Information

9 Months Ended

Dec. 31, 2012

Segment Reporting [Abstract]

Segment and Geographic Information

SEGMENT AND GEOGRAPHIC INFORMATION

Based on its operating management and financial reporting structure, the Company has determined that it has one reportable business segment: the design, development and sale of integrated circuits.

The following is a summary of net revenues by geographic area based on the location to which product is shipped:



	Three Months Ended December 31,				Nine Months Ended December 31,
	2012		2011		2012		2011
	(In thousands)
United States	$	4,951	$	4,307	$	14,152	$	13,780
China	2,746		4,018		11,054		13,446
Malaysia	5,929		8,079		13,662		22,286
Singapore	1,989		2,010		5,497		8,909
Rest of the world	1,899		1,561		5,942		5,385
	$	17,514	$	19,975	$	50,307	$	63,806

All sales are denominated in United States dollars.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599

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Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

The Company and Summary of Significant Accounting Policies The Company and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Dec. 31, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of presentation	Basis of presentation The accompanying unaudited condensed consolidated financial statements of GSI Technology, Inc. and its subsidiaries (“GSI” or the “Company”) have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") and pursuant to the instructions to Form 10-Q and Article 10 of Regulation S-X of the Securities and Exchange Commission. Accordingly, the interim financial statements do not include all of the information and footnotes required by generally accepted accounting principles for annual financial statements. These interim financial statements contain all adjustments (which consist of only normal, recurring adjustments) that are, in the opinion of management, necessary to state fairly the interim financial information included therein. The Company believes that the disclosures are adequate to make the information not misleading. However, these financial statements should be read in conjunction with the audited consolidated financial statements and related notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended March 31, 2012. The consolidated results of operations for the three months and nine months ended December 31, 2012 are not necessarily indicative of the results to be expected for the entire fiscal year.
Recent accounting pronouncements	Recent accounting pronouncements In June 2011, the Financial Accounting Standards Board ("FASB") amended its guidance on the presentation of comprehensive income. Under the amended guidance, an entity has the option to present comprehensive income in either one continuous statement or two consecutive financial statements. A single statement must present the components of net income and total net income, the components of other comprehensive income and total other comprehensive income, and a total for comprehensive income. In a two-statement approach, an entity must present the components of net income and total net income in the first statement. That statement must be immediately followed by a financial statement that presents the components of other comprehensive income, a total for other comprehensive income, and a total for comprehensive income. The entity is also required to present on the face of its financial statements reclassification adjustments for items that are reclassified from other comprehensive income to net income in the statement(s) where the components of net income and the components of other comprehensive income are presented. The option under previous guidance that permitted the presentation of components of other comprehensive income as part of the statement of changes in stockholders' equity has been eliminated. In December 2011, the FASB further amended its guidance to defer changes related to the presentation of reclassification adjustments indefinitely as a result of concerns raised by stakeholders that the new presentation requirements would be difficult for preparers and add unnecessary complexity to financial statements. The amendment (other than the portion regarding the presentation of reclassification adjustments which, as noted above, has been deferred indefinitely) was effective during the quarter ended June 30, 2012. The amendment impacted the presentation of the consolidated financial statements but did not impact the Company's financial position, results of operations or cash flows.

Net Income Per Common Share (Tables)

9 Months Ended

Dec. 31, 2012

Earnings Per Share [Abstract]

Schedule of computation of basic and diluted net income per share

The following table sets forth the computation of basic and diluted net income per share:



	Three Months Ended December 31,				Nine Months Ended December 31,
	2012		2011		2012		2011
	(In thousands, except per share amounts)
Net income	$	844	$	991	$	2,896	$	5,927
Denominators:
Weighted average shares—Basic	26,963		28,504		27,152		28,713
Dilutive effect of employee stock options	1,024		685		805		1,148
Dilutive effect of employee stock purchase plan options	—		—		—		—
Weighted average shares—Dilutive	27,987		29,189		27,957		29,861
Net income per share—Basic	$	0.03	$	0.03	$	0.11	$	0.21
Net income per share—Diluted	$	0.03	$	0.03	$	0.10	$	0.20

Schedule of antidilutive securities excluded from computation of earnings per share



	Three Months Ended December 31,		Nine Months Ended December 31,
	2012	2011	2012	2011
	(In thousands)
Stock options	3,243	2,640	3,130	1,140

Balance Sheet Detail (Tables)

9 Months Ended

Dec. 31, 2012

BALANCE SHEET DETAIL [Abstract]

Schedule of Inventories



	December 31, 2012		March 31, 2012
	(In thousands)
Inventories:
Work-in-progress	$	5,072	$	6,163
Finished goods	9,443		9,832
Inventory at distributors	673		730
	$	15,188	$	16,725

Schedule of Accounts Receivable, Net



	December 31, 2012			March 31, 2012
	(In thousands)
Accounts receivable, net:
Accounts receivable	$	8,762		$	10,679
Less: Allowances for sales returns, doubtful accounts and other	(100		)	(100		)
	$	8,662		$	10,579

Schedule of Prepaid Expenses and Other Current Assets



	December 31, 2012		March 31, 2012
	(In thousands)
Prepaid expenses and other current assets:
Prepaid tooling and masks	$	1,296	$	2,310
Prepaid income taxes	3,958		4,287
Other receivables	629		608
Other prepaid expenses	929		903
	$	6,812	$	8,108

Schedule of Property and Equipment, Net



	December 31, 2012			March 31, 2012
	(In thousands)
Property and equipment, net:
Computer and other equipment	$	16,312		$	16,235
Software	4,690			4,497
Land	3,900			3,900
Building and building improvements	2,256			2,256
Furniture and fixtures	110			110
Leasehold improvements	767			762
Construction in progress	51			201
	28,086			27,961
Less: Accumulated depreciation and amortization	(16,862		)	(15,155		)
	$	11,224		$	12,806

Schedule of Other Assets



	December 31, 2012		March 31, 2012
	(In thousands)
Other assets:
Non-current deferred income taxes	$	985	$	619
Intangibles, net	789		925
Deposits	83		83
	$	1,857	$	1,627

Schedule of Intangible Assets



	Life in Years	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Intangible assets:
Product designs	7	$	590	$	281	$	309
Patents	9	720		267		453
Software	5	80		53		27
		$	1,390	$	601	$	789

Schedule of Accrued Expenses and Other Liabilities



	December 31, 2012		March 31, 2012
	(In thousands)
Accrued expenses and other liabilities:
Accrued compensation	$	2,011	$	1,636
Accrued professional fees	275		1,233
Accrued commissions	341		332
Accrued royalties	17		24
Accrued income taxes	—		203
Accrued equipment and software costs	71		131
Other accrued expenses	672		784
	$	3,387	$	4,343

Financial Instruments (Tables)

9 Months Ended

Dec. 31, 2012

Fair Value Disclosures [Abstract]

Schedule of Fair value of financial assets and liabilities measured on a recurring basis

The fair value of financial assets and liabilities measured on a recurring basis is as follows (in thousands):



			Fair Value Measurement at Reporting Date Using
			Quoted Prices in Active Markets for Identical Assets or Liabilities		Significant Other Observable Inputs		Significant Unobservable Inputs
	December 31, 2012		(Level 1)		(Level 2)		(Level 3)
Assets:
Money market funds	$	6,246	$	6,246	$	—	$	—
Marketable securities	64,680		—		64,680		—
Total	$	70,926	$	6,246	$	64,680	$	—



			Fair Value Measurement at Reporting Date Using
			Quoted Prices in Active Markets for Identical Assets or Liabilities		Significant Other Observable Inputs		Significant Unobservable Inputs
	March 31, 2012		(Level 1)		(Level 2)		(Level 3)
Assets:
Money market funds	$	11,275	$	11,275	$	—	$	—
Marketable securities	60,541		—		60,541		—
Total	$	71,816	$	11,275	$	60,541	$	—

Schedule of Available-for-sale investments

The following table summarizes the Company’s available-for-sale investments:



	December 31, 2012
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
Short-term investments:
State and municipal obligations	$	13,941	$	9	$	—		$	13,950
Corporate notes	8,088		23		—			8,111
Certificates of deposit	10,975		17		—			10,992
Total short-term investments	$	33,004	$	49	$	—		$	33,053
Long-term investments:
State and municipal obligations	$	11,124	$	8	$	—		$	11,132
Corporate notes	8,448		4		—			8,452
Certificates of deposit	5,998		19		—			6,017
Other	6,050		—		(24		)	6,026
Total long-term investments	$	31,620	$	31	$	(24	)	$	31,627



	March 31, 2012
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(In thousands)
Short-term investments:
State and municipal obligations	$	14,261	$	18	$	—		$	14,279
Corporate notes	3,037		4		—			3,041
Certificates of deposit	9,705		19		—			9,724
Total short-term investments	$	27,003	$	41	$	—		$	27,044
Long-term investments:
State and municipal obligations	$	15,992	$	26	$	—		$	16,018
Corporate notes	6,201		11		—			6,212
Certificates of deposit	8,473		52		—			8,525
Other	2,758		—		(16		)	2,742
Total long-term investments	$	33,424	$	89	$	(16	)	$	33,497

Schedule of Contractual maturities of the available-for-sale non-equity investments

As of December 31, 2012, contractual maturities of the Company’s available-for-sale non-equity investments were as follows:



	Cost		Fair Value
	(In thousands)
Maturing within one year	$	33,004	$	33,053
Maturing in one to three years	31,620		31,627
	$	64,624	$	64,680

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 19, 20, 21
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 17
-Subparagraph a, b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 03-1
-Paragraph 21
-Subparagraph a, b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References + Details

Stock-Based Compensation (Tables)

9 Months Ended

Dec. 31, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of stock option activities

The following table summarizes the Company’s stock option activities for the nine months ended December 31, 2012:



	Number of Shares Underlying Outstanding Options		Weighted Average Remaining Contractual Life (Years)	Weighted Average Exercise Price		Intrinsic Value
Options outstanding as of March 31, 2012:	5,626,148			$	4.64
Granted	768,443			$	4.78
Exercised	(50,123	)		$	3.42	$	81,815
Forfeited	(76,663	)		$	4.68
Options outstanding as of December 31, 2012	6,267,805		6.15	$	4.67	$	10,776,890
Options exercisable as of December 31, 2012	3,775,060		4.71	$	4.21	$	7,990,611
Options vested and expected to vest	6,206,936		6.12	$	4.66	$	10,716,433

Schedule of options outstanding by exercise price

Options outstanding by exercise price at December 31, 2012 were as follows:



	Options Outstanding
					Options Exercisable
Exercise Price	Number of Shares Underlying Outstanding Options	Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (Years)	Number of Shares Underlying Vested and Exercisable Options	Weighted Average Exercise Price
$2.10 – 2.49	677,585	$	2.23	2.54	677,585	$	2.23
$2.83 – 3.43	838,586	$	3.34	6.16	597,849	$	3.31
$3.50 – 3.94	287,327	$	3.68	3.81	287,327	$	3.68
$4.00	727,288	$	4.00	6.43	537,171	$	4.00
$4.17 – 4.43	634,745	$	4.23	7.43	260,185	$	4.27
$4.50 – 4.92	638,623	$	4.82	8.34	148,639	$	4.68
$5.50	883,208	$	5.50	3.88	883,208	$	5.50
$5.59 - 6.28	805,990	$	5.91	7.71	200,084	$	5.86
$6.54 - 7.00	630,833	$	6.76	7.98	141,202	$	6.85
$9.20	143,620	$	9.20	8.08	41,810	$	9.20
	6,267,805	$	4.67		3,775,060

Summary of stock-based compensation expense by line item

The following table summarizes stock-based compensation expense by line item in the Condensed Consolidated Statements of Operations, all relating to employee stock plans:



	Three Months Ended December 31,				Nine Months Ended December 31,
	2012		2011		2012		2011

Cost of revenues	$	68	$	79	$	245	$	237
Research and development	287		275		861		787
Selling, general and administrative	210		178		582		533
Total	$	565	$	532	$	1,688	$	1,557

Summary of valuation assumptions

The Company calculated the fair value of stock-based awards in the periods presented using the Black-Scholes option pricing model and the following weighted average assumptions:



	Three Months Ended December 31,				Nine Months Ended December 31,
	2012		2011		2012	2011
Stock Option Plans:
Risk-free interest rate	0.69	%	0.96	%	0.67 - 0.79%	0.96 - 1.89%
Expected life (in years)	5.00		5.00		5.00	5.00
Volatility	50.2	%	52.7	%	50.2 - 52.9%	50.8 - 52.7%
Dividend yield	—		—		—	—
Employee Stock Purchase Plan:
Risk-free interest rate	0.14	%	0.05	%	0.14 - 0.15%	0.05 - 0.07%
Expected life (in years)	0.50		0.50		0.50	0.50
Volatility	47.3	%	43.9	%	23.4 - 47.3%	43.9 - 52.1%
Dividend yield	—		—		—	—

- Definition

Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

+ References + Details

Segment and Geographic Information (Tables)

9 Months Ended

Dec. 31, 2012

Segment Reporting [Abstract]

Summary of net revenues by geographic area based on location to which product is shipped

The following is a summary of net revenues by geographic area based on the location to which product is shipped:



	Three Months Ended December 31,				Nine Months Ended December 31,
	2012		2011		2012		2011
	(In thousands)
United States	$	4,951	$	4,307	$	14,152	$	13,780
China	2,746		4,018		11,054		13,446
Malaysia	5,929		8,079		13,662		22,286
Singapore	1,989		2,010		5,497		8,909
Rest of the world	1,899		1,561		5,942		5,385
	$	17,514	$	19,975	$	50,307	$	63,806

Net Income Per Common Share Computation of basic and diluted net income per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 844	$ 991	$ 2,896	$ 5,927
Weighted average shares -- Basic	26,963	28,504	27,152	28,713
Weighted average shares -- Diluted	27,987	29,189	27,957	29,861
Net income per share -- Basic	$ 0.03	$ 0.03	$ 0.11	$ 0.21
Net income per share -- Diluted	$ 0.03	$ 0.03	$ 0.10	$ 0.20
Employee Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive effect	1,024	685	805	1,148
Employee Stock Purchase Plan Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive effect	0	0	0	0

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.21)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Subparagraph (SX 210.7-04.19)
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 18
-Article 7

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 36, 37, 38
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 20
-Article 5

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 21
-Article 9

+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References + Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Glossary Weighted-Average Number of Common Shares Outstanding
-URI http://asc.fasb.org/extlink&oid=6528421

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Net Income Per Common Share Schedule of antidilutive securities excluded from computation of earnings per share (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Employee Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options	3,243	2,640	3,130	1,140

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 13, 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Balance Sheet Detail Schedule of Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2012	Mar. 31, 2012
Inventories:
Work-in-progress	$ 5,072	$ 6,163
Finished goods	9,443	9,832
Inventory at distributors	673	730
Total Inventory	$ 15,188	$ 16,725

Balance Sheet Detail Schedule of Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2012	Mar. 31, 2012
Accounts receivable, net:
Accounts receivable	$ 8,762	$ 10,679
Less: Allowances for sales returns, doubtful accounts and other	(100)	(100)
Total accounts receivable, net	$ 8,662	$ 10,579

Balance Sheet Detail Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2012	Mar. 31, 2012
Prepaid expenses and other current assets:
Prepaid tooling and masks	$ 1,296	$ 2,310
Prepaid income taxes	3,958	4,287
Other receivables	629	608
Other prepaid expenses	929	903
Total prepaid expenses and other current assets	$ 6,812	$ 8,108

Balance Sheet Detail Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2012
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 28,086		$ 28,086		$ 27,961
Less: Accumulated depreciation and amortization	(16,862)		(16,862)		(15,155)
Property, Plant and Equipment, Net	11,224		11,224		12,806
Depreciation and amortization	531	$ 541	1,712	$ 1,870
Computer and other equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	16,312		16,312		16,235
Software
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	4,690		4,690		4,497
Land
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	3,900		3,900		3,900
Building and building improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	2,256		2,256		2,256
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	110		110		110
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	767		767		762
Construction in progress
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 51		$ 51		$ 201

Balance Sheet Detail Schedule of Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2012	Mar. 31, 2012
Other assets:
Non-current deferred income taxes	$ 985	$ 619
Intangibles, net	789	925
Deposits	83	83
Total Other Assets	$ 1,857	$ 1,627

Balance Sheet Detail Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,390		$ 1,390
Accumulated Amortization	601		601
Net Carrying Amount	789		789		$ 925
Amortization of Intangible Assets	45	$ 45	$ 135	$ 135
Product designs
Finite-Lived Intangible Assets [Line Items]
Life in Years			7 years
Gross Carrying Amount	590		$ 590
Accumulated Amortization	281		281
Net Carrying Amount	309		$ 309
Patents
Finite-Lived Intangible Assets [Line Items]
Life in Years			9 years
Gross Carrying Amount	720		$ 720
Accumulated Amortization	267		267
Net Carrying Amount	453		$ 453
Software
Finite-Lived Intangible Assets [Line Items]
Life in Years			5 years
Gross Carrying Amount	80		$ 80
Accumulated Amortization	53		53
Net Carrying Amount	$ 27		$ 27

Balance Sheet Detail Schedule of Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2012	Mar. 31, 2012
Accrued expenses and other liabilities:
Accrued compensation	$ 2,011	$ 1,636
Accrued professional fees	275	1,233
Accrued commissions	341	332
Accrued royalties	17	24
Accrued income taxes	0	203
Accrued equipment and software costs	71	131
Other accrued expenses	672	784
Total Accrued Expenses and Other Liabilities	$ 3,387	$ 4,343

- Definition

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.

+ References + Details

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References + Details

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for royalties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References + Details

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for sales commissions. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References + Details

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References + Details

Income Taxes Narative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Income Taxes Narative (Details) - USD ($) $ in Thousands	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2012
Operating Loss Carryforwards [Line Items]
Unrecognized tax benefits, current		$ 0		$ 599
Unrecognized tax benefits, long-term		2,111		$ 1,835
Amount recorded as a reduction to net deferred tax benefits		623
Unrecognized tax benefit balance		2,589
Unrecognized tax benefits that would impact effective tax rate		2,589
Potential reduction in uncertain tax benefits of up to		582
Tax Adjustments, Settlements, and Unusual Provisions	$ 480	$ 168
Effective income tax rate		26.10%	19.50%

- Definition

Amount of an unrecognized tax benefit that is directly related to a position taken in a tax year that results in a net operating loss carryforward. This amount is presented as a reduction of the related deferred tax asset in the balance sheet if that deferred tax asset is not used. This amount is presented separately from the deferred tax asset for a net operating loss carryforward if this unrelated tax benefit is associated with a different tax position.

+ References + Details

Financial Instruments Schedule of Fair value of financial assets and liabilities measured on a recurring basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2012	Mar. 31, 2012
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	$ 70,926	$ 71,816
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	6,246	11,275
Significant Other Observable Inputs (Level 2)
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	64,680	60,541
Significant Unobservable Inputs (Level 3)
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	0	0
Money market funds
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	6,246	11,275
Money market funds \| Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	6,246	11,275
Money market funds \| Significant Other Observable Inputs (Level 2)
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	0	0
Money market funds \| Significant Unobservable Inputs (Level 3)
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	0	0
Other Aggregated Investments
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	64,680	60,541
Other Aggregated Investments \| Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	0	0
Other Aggregated Investments \| Significant Other Observable Inputs (Level 2)
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	64,680	60,541
Other Aggregated Investments \| Significant Unobservable Inputs (Level 3)
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	0	$ 0
Short-term Investments \| Significant Other Observable Inputs (Level 2)
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	33,100
Other Long-term Investments \| Significant Other Observable Inputs (Level 2)
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	$ 31,600

Financial Instruments Schedule of Available-for-sale investments (Details) - USD ($)	Dec. 31, 2012	Mar. 31, 2012
Short-term Investments [Abstract]
Fair Value	$ 64,680,000
Long-term Investments [Abstract]
Deferred tax liability related to unrecognized gains and losses	14,000	$ 26,000
Short-term Investments
Short-term Investments [Abstract]
Available-for-sale securities, Cost	33,004,000	27,003,000
Available-for-sale securities, Gross Unrealized Gains	49,000	41,000
Available-for-sale securities, Gross Unrealized Losses	0	0
Fair Value	33,053,000	27,044,000
Short-term Investments \| State and municipal obligations
Short-term Investments [Abstract]
Available-for-sale securities, Cost	13,941,000	14,261,000
Available-for-sale securities, Gross Unrealized Gains	9,000	18,000
Available-for-sale securities, Gross Unrealized Losses	0	0
Fair Value	13,950,000	14,279,000
Short-term Investments \| Corporate notes
Short-term Investments [Abstract]
Available-for-sale securities, Cost	8,088,000	3,037,000
Available-for-sale securities, Gross Unrealized Gains	23,000	4,000
Available-for-sale securities, Gross Unrealized Losses	0	0
Fair Value	8,111,000	3,041,000
Short-term Investments \| Certificates of deposit
Short-term Investments [Abstract]
Available-for-sale securities, Cost	10,975,000	9,705,000
Available-for-sale securities, Gross Unrealized Gains	17,000	19,000
Available-for-sale securities, Gross Unrealized Losses	0	0
Fair Value	10,992,000	9,724,000
Other Long-term Investments
Short-term Investments [Abstract]
Available-for-sale securities, Cost	31,620,000	33,424,000
Available-for-sale securities, Gross Unrealized Gains	31,000	89,000
Available-for-sale securities, Gross Unrealized Losses	(24,000)	(16,000)
Fair Value	31,627,000	33,497,000
Other Long-term Investments \| State and municipal obligations
Short-term Investments [Abstract]
Available-for-sale securities, Cost	11,124,000	15,992,000
Available-for-sale securities, Gross Unrealized Gains	8,000	26,000
Available-for-sale securities, Gross Unrealized Losses	0	0
Fair Value	11,132,000	16,018,000
Other Long-term Investments \| Corporate notes
Short-term Investments [Abstract]
Available-for-sale securities, Cost	8,448,000	6,201,000
Available-for-sale securities, Gross Unrealized Gains	4,000	11,000
Available-for-sale securities, Gross Unrealized Losses	0	0
Fair Value	8,452,000	6,212,000
Other Long-term Investments \| Certificates of deposit
Short-term Investments [Abstract]
Available-for-sale securities, Cost	5,998,000	8,473,000
Available-for-sale securities, Gross Unrealized Gains	19,000	52,000
Available-for-sale securities, Gross Unrealized Losses	0	0
Fair Value	6,017,000	8,525,000
Other Long-term Investments \| Other
Short-term Investments [Abstract]
Available-for-sale securities, Cost	6,050,000	2,758,000
Available-for-sale securities, Gross Unrealized Gains	0	0
Available-for-sale securities, Gross Unrealized Losses	(24,000)	(16,000)
Fair Value	$ 6,026,000	$ 2,742,000

Financial Instruments Schedule of Contractual maturities of the available-for-sale non-equity investments (Details) $ in Thousands	Dec. 31, 2012 USD ($)
Fair Value Disclosures [Abstract]
Maturing within one year, Cost	$ 33,004
Maturing in one to three years, Cost	31,620
Total, Cost	64,624
Maturing within one year, Fair Value	33,053
Maturing in one to three years, Fair Value	31,627
Fair Value	$ 64,680

- Definition

Amount of debt securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 2
-Subparagraph (b)-(g)
-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 137
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 15C
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 16
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 15D
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Commitments and Contingencies Product Liabilities (Details)	9 Months Ended
	Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
Product Liability, Warranty Period	3 years

Commitments and Contingencies Legal proceedings (Details) - Pending Litigation	9 Months Ended
	Dec. 31, 2012 Customers Distributors Patents
United States District Court for the District of Minnesota
Loss Contingencies [Line Items]
Loss Contingency, Alledged Patents Infringed Upon, Number	5
United States International Trade Commission
Loss Contingencies [Line Items]
Loss Contingency, Alledged Patents Infringed Upon, Number	3
Loss Contingency, Additional Alledged Patent Infringement, Number	1
Loss Contingency, Distributors Involved In Lawsuit, Number \| Distributors	3
Loss Contingency, Customers Involved In Lawsuit, Number \| Customers	11
Loss Contingency, Distributors Subsequently Dismissed From Investigation, Number \| Distributors	2
Loss Contingency, Customers Subsequently Dismissed From Investigation, Number \| Customers	10

Stock-Based Compensation Summary of stock option activities (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares Underlying Outsanding Options, Options outstanding, Beginning balance			5,626,148
Weighted Average Exercise Price, Options outstanding, Beginning balance			$ 4.64
Number of Shares Underlying Outstanding Options, Granted			768,443
Weighted Average Exercise Price, Granted			$ 4.78
Number of Shares Underlying Outstanding Options, Exercised			(50,123)
Weighted Average Exercise Price, Exercised			$ 3.42
Intrinsic Value, Exercised			$ 81,815
Number of Shares Underlying Outstanding Options, Forfeited			(76,663)
Weighted Average Exercise Price, Forfeited			$ 4.68
Intrinsic Value, Options outstanding, Ending balance	$ 10,776,890		$ 10,776,890
Number of Shares Underlying Outsanding Options, Options outstanding, Ending balance	6,267,805		6,267,805
Weighted Average Remaining Contractual Life (Years), Options outstanding, Ending balance			6 years 1 month 25 days
Weighted Average Exercise Price, Options outstanding, Ending balance	$ 4.67		$ 4.67
Number of Shares of Underlying Outstanding Options, Options exercisable, Ending balance	3,775,060		3,775,060
Weighted Average Remaining Contractual Life (Years), Options exercisable, Ending balance			4 years 8 months 15 days
Weighted Average Exercise Price, Options exercisable, Ending balance	$ 4.21		$ 4.21
Intrinsic Value, Options exercisable, Ending balance	$ 7,990,611		$ 7,990,611
Number of Shares underlying Outstanding Options, Options vested and expected to vest, Ending balance	6,206,936		6,206,936
Weighted Average Remaining Contractual Life (Years), Options vested and expected to vest, Ending balance			6 years 1 month 15 days
Weighted Average Exercise Price, Options vested and expeced to vest, Ending balance	$ 4.66		$ 4.66
Intrinsic Value, Options vested and expected to vest, Ending balance	$ 10,716,433		$ 10,716,433
Weighted average fair value, Options granted	$ 2.43	$ 2.24	$ 2.12	$ 2.73
2007 Equity Incentive Plan [Member] \| Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock available for grant	5,009,581		5,009,581

Stock-Based Compensation Schedule of options outstanding by exercise price (Details)	9 Months Ended
	Dec. 31, 2012 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Range, Number of Shares Underlying Outstanding Options \| shares	6,267,805
Exercise Price, Range, Weighted Average Exercise Price, Options Outstanding	$ 4.67
Exercise Price, Range, Number of Shares Underlying Vested and Exercisable Options, Options Exercisable \| shares	3,775,060
Exercise Price Range, Range $2.10 - 2.49
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Lower range	$ 2.10
Exercise Price, Upper range	$ 2.49
Exercise Price, Range, Number of Shares Underlying Outstanding Options \| shares	677,585
Exercise Price, Range, Weighted Average Exercise Price, Options Outstanding	$ 2.23
Exercise Price, Range, Weighted Average Remaining Contractual Life (Years), Options Outstanding	2 years 6 months 16 days
Exercise Price, Range, Number of Shares Underlying Vested and Exercisable Options, Options Exercisable \| shares	677,585
Exercise Price, Range, Weighted Average Exercise Price, Options Exercisable	$ 2.23
Exercise Price Range, Range $2.83 - 3.43
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Lower range	2.83
Exercise Price, Upper range	$ 3.43
Exercise Price, Range, Number of Shares Underlying Outstanding Options \| shares	838,586
Exercise Price, Range, Weighted Average Exercise Price, Options Outstanding	$ 3.34
Exercise Price, Range, Weighted Average Remaining Contractual Life (Years), Options Outstanding	6 years 1 month 27 days
Exercise Price, Range, Number of Shares Underlying Vested and Exercisable Options, Options Exercisable \| shares	597,849
Exercise Price, Range, Weighted Average Exercise Price, Options Exercisable	$ 3.31
Exercise Price Range, Range $3.50 - 3.94
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Lower range	3.50
Exercise Price, Upper range	$ 3.94
Exercise Price, Range, Number of Shares Underlying Outstanding Options \| shares	287,327
Exercise Price, Range, Weighted Average Exercise Price, Options Outstanding	$ 3.68
Exercise Price, Range, Weighted Average Remaining Contractual Life (Years), Options Outstanding	3 years 9 months 22 days
Exercise Price, Range, Number of Shares Underlying Vested and Exercisable Options, Options Exercisable \| shares	287,327
Exercise Price, Range, Weighted Average Exercise Price, Options Exercisable	$ 3.68
Exercise Price Range, Range $4.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Lower range	4.00
Exercise Price, Upper range	$ 4.00
Exercise Price, Range, Number of Shares Underlying Outstanding Options \| shares	727,288
Exercise Price, Range, Weighted Average Exercise Price, Options Outstanding	$ 4.00
Exercise Price, Range, Weighted Average Remaining Contractual Life (Years), Options Outstanding	6 years 5 months 5 days
Exercise Price, Range, Number of Shares Underlying Vested and Exercisable Options, Options Exercisable \| shares	537,171
Exercise Price, Range, Weighted Average Exercise Price, Options Exercisable	$ 4.00
Exercise Price Range, Range $4.17 - 4.43
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Lower range	4.17
Exercise Price, Upper range	$ 4.43
Exercise Price, Range, Number of Shares Underlying Outstanding Options \| shares	634,745
Exercise Price, Range, Weighted Average Exercise Price, Options Outstanding	$ 4.23
Exercise Price, Range, Weighted Average Remaining Contractual Life (Years), Options Outstanding	7 years 5 months 5 days
Exercise Price, Range, Number of Shares Underlying Vested and Exercisable Options, Options Exercisable \| shares	260,185
Exercise Price, Range, Weighted Average Exercise Price, Options Exercisable	$ 4.27
Exercise Price Range, Range $4.50 - 4.92
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Lower range	4.50
Exercise Price, Upper range	$ 4.92
Exercise Price, Range, Number of Shares Underlying Outstanding Options \| shares	638,623
Exercise Price, Range, Weighted Average Exercise Price, Options Outstanding	$ 4.82
Exercise Price, Range, Weighted Average Remaining Contractual Life (Years), Options Outstanding	8 years 4 months 1 day
Exercise Price, Range, Number of Shares Underlying Vested and Exercisable Options, Options Exercisable \| shares	148,639
Exercise Price, Range, Weighted Average Exercise Price, Options Exercisable	$ 4.68
Exercise Price Range, Range $5.50
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Lower range	5.50
Exercise Price, Upper range	$ 5.50
Exercise Price, Range, Number of Shares Underlying Outstanding Options \| shares	883,208
Exercise Price, Range, Weighted Average Exercise Price, Options Outstanding	$ 5.50
Exercise Price, Range, Weighted Average Remaining Contractual Life (Years), Options Outstanding	3 years 10 months 17 days
Exercise Price, Range, Number of Shares Underlying Vested and Exercisable Options, Options Exercisable \| shares	883,208
Exercise Price, Range, Weighted Average Exercise Price, Options Exercisable	$ 5.50
Exercise Price Range, Range $5.59 - 6.28
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Lower range	5.59
Exercise Price, Upper range	$ 6.28
Exercise Price, Range, Number of Shares Underlying Outstanding Options \| shares	805,990
Exercise Price, Range, Weighted Average Exercise Price, Options Outstanding	$ 5.91
Exercise Price, Range, Weighted Average Remaining Contractual Life (Years), Options Outstanding	7 years 8 months 15 days
Exercise Price, Range, Number of Shares Underlying Vested and Exercisable Options, Options Exercisable \| shares	200,084
Exercise Price, Range, Weighted Average Exercise Price, Options Exercisable	$ 5.86
Exercise Price Range, Range $6.54 - 7.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Lower range	6.54
Exercise Price, Upper range	$ 7.00
Exercise Price, Range, Number of Shares Underlying Outstanding Options \| shares	630,833
Exercise Price, Range, Weighted Average Exercise Price, Options Outstanding	$ 6.76
Exercise Price, Range, Weighted Average Remaining Contractual Life (Years), Options Outstanding	7 years 11 months 23 days
Exercise Price, Range, Number of Shares Underlying Vested and Exercisable Options, Options Exercisable \| shares	141,202
Exercise Price, Range, Weighted Average Exercise Price, Options Exercisable	$ 6.85
Exercise Price Range, Range $9.20
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price, Lower range	9.20
Exercise Price, Upper range	$ 9.20
Exercise Price, Range, Number of Shares Underlying Outstanding Options \| shares	143,620
Exercise Price, Range, Weighted Average Exercise Price, Options Outstanding	$ 9.20
Exercise Price, Range, Weighted Average Remaining Contractual Life (Years), Options Outstanding	8 years 28 days
Exercise Price, Range, Number of Shares Underlying Vested and Exercisable Options, Options Exercisable \| shares	41,810
Exercise Price, Range, Weighted Average Exercise Price, Options Exercisable	$ 9.20

Stock-Based Compensation Summary of stock-based compensation expense by line item (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	$ 565	$ 532	$ 1,688	$ 1,557
Recognized income tax benefits	51	54	167	175
Windfall tax benefits realized	14	16	20	74
Total unrecognized compensation cost	4,000		$ 4,000
Weighted average period over which unrecognized compensation will be recognized			2 years 20 days
Cost of revenues
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	68	79	$ 245	237
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	287	275	861	787
Selling, general and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	$ 210	$ 178	$ 582	$ 533

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References + Details

Stock-Based Compensation Summary of valuation assumptions (Details)	3 Months Ended		9 Months Ended
	Dec. 31, 2012 Rate	Dec. 31, 2011 Rate	Dec. 31, 2012	Dec. 31, 2011
Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.69%	0.96%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum			0.67%	0.96%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum			0.79%	1.89%
Expected life (in years)			5 years	5 years
Volatility	50.20%	52.70%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum			50.20%	50.80%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum			52.90%	52.70%
Dividend yield	0.00%	0.00%	0.00%	0.00%
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.14%	0.05%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum			0.14%	0.05%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum			0.15%	0.07%
Expected life (in years)			6 months	6 months
Volatility	47.30%	43.90%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum			23.40%	43.90%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum			47.30%	52.10%
Dividend yield	0.00%	0.00%	0.00%	0.00%

Segment and Geographic Information Summary of net revenues by geographic area based on location to which product is shipped (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2012 USD ($) business_segments	Dec. 31, 2011 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of reportable segments \| business_segments			1
Net revenues	$ 17,514	$ 19,975	$ 50,307	$ 63,806
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	4,951	4,307	14,152	13,780
CHINA
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	2,746	4,018	11,054	13,446
MALAYSIA
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	5,929	8,079	13,662	22,286
SINGAPORE
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	1,989	2,010	5,497	8,909
Rest of the world
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 1,899	$ 1,561	$ 5,942	$ 5,385