PDF Solutions (PDFS) 10-Q 6 Nov 13 2013 Q3 Quarterly report Financial data

Document_And_Entity_Informatio

Document And Entity Information	9 Months Ended
	Sep. 30, 2013	Oct. 29, 2013
Document and Entity Information [Abstract]	'	'
Entity Registrant Name	'PDF SOLUTIONS INC	'
Document Type	'10-Q	'
Current Fiscal Year End Date	'--12-31	'
Entity Common Stock, Shares Outstanding	'	30,185,802
Amendment Flag	'false	'
Entity Central Index Key	'0001120914	'
Entity Current Reporting Status	'Yes	'
Entity Voluntary Filers	'No	'
Entity Filer Category	'Accelerated Filer	'
Entity Well-known Seasoned Issuer	'No	'
Document Period End Date	30-Sep-13	'
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q3	'

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (unaudited) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$85,233	$61,637
Accounts receivable, net of allowance of $269 and $351, respectively	28,288	33,959
Deferred tax assets - current portion	4,868	3,589
Prepaid expenses and other current assets	3,524	3,413
Total current assets	121,913	102,598
Property and equipment, net	6,265	3,898
Deferred tax assets - non-current portion	10,971	16,471
Other non-current assets	1,893	1,293
Total assets	141,042	124,260
Current liabilities:	'	'
Accounts payable	659	2,054
Accrued compensation and related benefits	6,871	10,723
Accrued and other current liabilities	1,352	2,882
Deferred revenues	2,375	3,232
Billings in excess of recognized revenues	286	807
Total current liabilities	11,543	19,698
Non-current liabilities	3,557	3,502
Total liabilities	15,100	23,200
Commitments and contingencies (Note 10)	'	'
Stockholders’ equity:	'	'
Preferred stock, $0.00015 par value, 5,000 shares authorized, no shares issued and outstanding	0	0
Common stock, $0.00015 par value, 70,000 shares authorized: shares issued 34,968 and 34,027, respectively; shares outstanding 30,159 and 29,226, respectively	5	4
Additional paid-in-capital	231,125	220,361
Treasury stock at cost, 4,809 and 4,801 shares, respectively	-28,017	-27,778
Accumulated deficit	-77,471	-91,578
Accumulated other comprehensive income	300	51
Total stockholders’ equity	125,942	101,060
Total liabilities and stockholders’ equity	$141,042	$124,260

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (unaudited) (Parentheticals) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, except Per Share data, unless otherwise specified
Accounts receivable, allowance (in Dollars)	$269	$351
Preferred stock, par value (in Dollars per share)	$0.00	$0.00
Preferred stock, shares authorized	5,000	5,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in Dollars per share)	$0.00	$0.00
Common stock, shares authorized	70,000	70,000
Common stock, shares issued	34,968	34,027
Common stock, shares outstanding	30,159	29,226
Treasury stock shares	4,809	4,801

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (unaudited) (USD $)	3 Months Ended		9 Months Ended
Share data in Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues:	'	'	'	'
Design-to-silicon-yield solutions	$17,015,000	$15,305,000	$46,813,000	$42,484,000
Gainshare performance incentives	8,474,000	7,246,000	27,562,000	23,241,000
Total revenues	25,489,000	22,551,000	74,375,000	65,725,000
Costs of design-to-silicon-yield solutions:	'	'	'	'
Direct costs of design-to-silicon-yield solutions	10,507,000	9,457,000	29,905,000	26,830,000
Amortization of acquired technology	'	'	'	261,000
Total costs of design-to-silicon-yield solutions	10,507,000	9,457,000	29,905,000	27,091,000
Gross profit	14,982,000	13,094,000	44,470,000	38,634,000
Operating expenses:	'	'	'	'
Research and development	3,396,000	3,203,000	9,944,000	9,651,000
Selling, general and administrative	3,812,000	4,498,000	13,010,000	14,122,000
Amortization of other acquired intangible assets	19,000	51,000	56,000	153,000
Restructuring charges (credits)	8,000	0	-35,000	83,000
Total operating expenses	7,235,000	7,752,000	22,975,000	24,009,000
Income from operations	7,747,000	5,342,000	21,495,000	14,625,000
Interest and other income (expense), net	-283,000	-179,000	-109,000	-166,000
Income before income taxes	7,464,000	5,163,000	21,386,000	14,459,000
Income tax provision	2,640,000	170,000	7,279,000	1,147,000
Net income	4,824,000	4,993,000	14,107,000	13,312,000
Net income per share:	'	'	'	'
Basic (in Dollars per share)	$0.16	$0.17	$0.48	$0.47
Diluted (in Dollars per share)	$0.15	$0.17	$0.45	$0.45
Weighted average common shares:	'	'	'	'
Basic (in Shares)	30,000	28,720	29,668	28,555
Diluted (in Shares)	31,623	30,180	31,198	29,596
Net income	4,824,000	4,993,000	14,107,000	13,312,000
Other comprehensive income:	'	'	'	'
Foreign currency translation adjustments, net of tax	236,000	257,000	249,000	-10,000
Reclassification adjustment for other-than-temporary impairment on auction-rate-securities recognized in earnings	'	'	'	216,000
Comprehensive income	$5,060,000	$5,250,000	$14,356,000	$13,518,000

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Cash Flows (unaudited) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Operating activities:	'	'
Net income	$14,107,000	$13,312,000
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	961,000	316,000
Stock-based compensation expense	4,942,000	3,476,000
Amortization of acquired intangible assets	56,000	413,000
Deferred taxes	4,220,000	-32,000
Losses (gains) on disposal of property and equipment	-9,000	8,000
Purchases of treasury stock in connection with tax withholdings on restricted stock grants	-395,000	-187,000
Provisions for (reversal of) doubtful accounts	-82,000	97,000
Gains on sale of investments	'	-50,000
Net impairment of investments	'	75,000
Tax benefit related to stock-based compensation expense	454,000	'
Excess tax benefit from stock-based compensation	-439,000	'
Changes in operating assets and liabilities:	'	'
Accounts receivable	6,021,000	-12,692,000
Prepaid expenses and other assets	-1,106,000	-811,000
Accounts payable	-1,261,000	-281,000
Accrued compensation and related benefits	-3,972,000	3,393,000
Accrued and other liabilities	-1,293,000	-532,000
Deferred revenues	-796,000	-555,000
Billings in excess of recognized revenues	-521,000	-1,306,000
Net cash provided by operating activities	20,887,000	4,644,000
Investing activities:	'	'
Proceeds from the sale of short-term investments	'	475,000
Purchases of property and equipment	-3,372,000	-2,066,000
Net cash used in investing activities	-3,372,000	-1,591,000
Financing activities:	'	'
Proceeds from exercise of stock options	4,270,000	4,753,000
Proceeds from employee stock purchase plan	1,317,000	977,000
Excess tax benefit from stock-based compensation	439,000	'
Purchases of treasury stock	'	-3,891,000
Net cash provided by financing activities	6,026,000	1,839,000
Effect of exchange rate changes on cash and cash equivalents	55,000	-1,000
Net change in cash and cash equivalents	23,596,000	4,891,000
Cash and cash equivalents, beginning of period	61,637,000	46,041,000
Cash and cash equivalents, end of period	85,233,000	50,932,000
Cash paid during the period for:	'	'
Income Taxes	$3,252,000	$1,807,000

Note_1_Basis_of_Presentation

Note 1 - Basis of Presentation	9 Months Ended
	Sep. 30, 2013
Disclosure Text Block [Abstract]	'
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	'
	1. BASIS OF PRESENTATION
	Basis of Presentation
	The interim unaudited condensed consolidated financial statements included herein have been prepared by PDF Solutions, Inc. (“the Company”) pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”), including the instructions to the Quarterly Report on Form 10-Q and Article 10 of Regulation S-X. Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted. The interim unaudited condensed consolidated financial statements reflect, in the opinion of management, all adjustments necessary (consisting only of normal recurring adjustments), to present a fair statement of results for the interim periods presented. The operating results for any interim period are not necessarily indicative of the results that may be expected for other interim periods or the full fiscal year. The accompanying interim unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto in the Company’s Annual Report on Form 10-K for the year ended December 31, 2012.
	The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries after the elimination of all significant intercompany balances and transactions.
	The condensed consolidated balance sheet at December 31, 2012  has been derived from the audited consolidated financial statements but does not include all disclosures required by accounting principles generally accepted in the United States of America.
	Use of Estimates  —  The preparation of financial statements in conformity with generally accepted accounting principles in the United States (“U.S. GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Significant estimates in these financial statements include stock-based compensation expense, allowances for doubtful accounts receivable, estimates for useful lives associated with long-lived assets, restructuring charges, fair value of financial instruments and income taxes and tax valuation allowances. Actual results could differ from those estimates.
	Revenue Recognition  — The Company derives revenue from two sources: Design-to-silicon-yield solutions and Gainshare performance incentives.
	Design-to-Silicon-Yield Solutions — Revenue that is derived from Design-to-silicon-yield solutions comes from services and software licenses. The Company recognizes revenue of Design-to-silicon-yield solutions as follows:
	The Company generates a significant portion of its Design-to-silicon-yield solutions revenue from fixed-price solution implementation service contracts delivered over a specific period of time. These contracts require reliable estimation of costs to perform obligations and the overall scope of each engagement. Revenue under project–based contracts for solution implementation services is recognized as services are performed using the cost-to-cost percentage of completion method of contract accounting. Losses on fixed-price solution implementation contracts are recognized in the period when they become probable. Revisions in profit estimates are reflected in the period in which the conditions that require the revisions become known and can be estimated. Revenue under time and materials contracts for solution implementation services are recognized as the services are performed. On occasion, the Company licenses its software products as a component of its fixed-price service contracts. In such instances, the software products are licensed to customers over a specified term of the agreement with support and maintenance to be provided at each customer's option over the license term. The amount of product and service revenue recognized in a given period is affected by the Company’s judgment as to whether an arrangement includes multiple deliverables and, if so, the Company’s determination of the fair value of each deliverable. In general, vendor-specific objective evidence of selling price (“VSOE”) does not exist for the Company’s solution implementation services and software products and because the Company’s services and products include our unique technology, the Company is not able to determine third-party evidence of selling price (“TPE”). Therefore, in such circumstances the Company uses best estimated selling prices (“BESP”) in the allocation of arrangement consideration. In determining BESP, the Company applies significant judgment as the Company’s weighs a variety of factors, based on the facts and circumstances of the arrangement. The Company typically arrives at BESP for a product or service that is not sold separately by considering company-specific factors such as geographies, internal costs, gross margin objectives, pricing practices used to establish bundled pricing, and existing portfolio pricing and discounting. After fair value is established for each deliverable, the total transaction amount is allocated to each deliverable based upon its relative fair value. Fees allocated to solution implementation services are recognized using the cost-to-cost percentage of completion method of contract accounting. Fees allocated to software and related support and maintenance are recognized under software revenue recognition guidance.
	The Company also licenses its software products separately from its solution implementations. For software license arrangements that do not require significant modification or customization of the underlying software, software license revenue is recognized under the residual method when (1) persuasive evidence of an arrangement exists, (2) delivery has occurred, (3) the fee is fixed or determinable, (4) collectability is probable, and (5) the arrangement does not require services that are essential to the functionality of the software. When arrangements include multiple elements such as support and maintenance, consulting (other than for its fixed price solution implementations), installation, and training, revenue is allocated to each element of a transaction based upon its fair value as determined by the Company’s VSOE and such services are recorded as services revenue. VSOE for maintenance is generally established based upon negotiated renewal rates while VSOE for consulting, installation, and training services is established based upon the Company’s customary pricing for such services when sold separately. Revenue for software licenses with extended payment terms is not recognized in excess of amounts due. For software license arrangements that require significant modification or customization of the underlying software, the software license revenue is recognized as services are performed using the cost-to-cost percentage of completion method of contract accounting, and such revenue is recorded as services revenue.
	Gainshare Performance Incentives  — When the Company enters into a contract to provide yield improvement services, the contract usually includes two components: (1) a fixed fee for performance by the Company of services delivered over a specific period of time; and (2) a Gainshare performance incentive component where the customer may pay a contingent variable fee, usually after the fixed fee period has ended. Revenue derived from Gainshare performance incentives represents profit sharing and performance incentives earned contingent upon the Company’s customers reaching certain defined operational levels established in related solution implementation service contracts. Gainshare performance incentives periods are usually subsequent to the delivery of all contractual services and therefore have no cost to the Company. Due to the uncertainties surrounding attainment of such operational levels, the Company recognizes Gainshare performance incentives revenue (to the extent of completion of the related solution implementation contract) upon receipt of performance reports or other related information from the customer supporting the determination of amounts and probability of collection.

Note_2_Recent_Accounting_Prono

Note 2 - Recent Accounting Pronouncements	9 Months Ended
	Sep. 30, 2013
Table Text Block [Abstract]	'
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]	'
	2. RECENT ACCOUNTING PRONOUNCEMENTS
	In July 2013, the Financial Accounting Standards Board ("FASB") amended its guidance related to the presentation of unrecognized tax benefits. The standard provides that an unrecognized tax benefit, or a portion of an unrecognized tax benefit, should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, except as follows. To the extent a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available at the reporting date under the tax law of the applicable jurisdiction to settle any additional income taxes that would result from the disallowance of a tax position or the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. This guidance is effective for annual reporting periods beginning on or after December 15, 2013, and interim periods within those annual periods. The guidance is to be applied prospectively to all unrecognized tax benefits that exist at the effective date. Retrospective application is permitted. The Company is currently assessing the impacts of this guidance.
	In December 2011, the Financial Accounting Standards Board (“FASB”) amended its guidance related to the disclosures about offsetting assets and liabilities. The standard requires the Company to disclose information about offsetting and related arrangements to enable users of its financial statements to understand the effect of those arrangements on its financial position. The guidance is effective for annual reporting periods beginning on or after January 1, 2013, and interim periods within those annual periods. The disclosures are applied retrospectively for all comparative periods presented. The adoption of this guidance did not have a material impact on the Company’s consolidated financial statements as it is disclosure-only in nature.
	In June 2011, the FASB amended its guidance related to the presentation of comprehensive income to increase comparability between U.S. GAAP and International Financial Reporting Standards (“IFRS”). This amended guidance eliminates the current option to report other comprehensive income and its components in the statement of changes in equity and instead requires presenting in one continuous statement or two separate but consecutive statements. Additionally, the amendment requires entities to present reclassification adjustments to show the effect of reclassifications on both the components of other comprehensive income and the components of net income in interim and annual financial statements. The amendments are effective for fiscal years, and interim periods within those years, beginning after December 15, 2011 with early adoption permitted. The guidance is effective for the Company’s fiscal year beginning January 1, 2012. In December 2011, the FASB issued an amendment to defer the presentation on the face of the financial statements the effects of reclassifications out of accumulated other comprehensive income on the components of net income and other comprehensive income for annual and interim financial statements. In February 2013, the FASB issued amendments to disclosure requirements for presentation of comprehensive income. The standard requires presentation (either in a single note or parenthetically on the face of the financial statements) of the effect of significant amounts reclassified from each component of accumulated other comprehensive income based on its source and the income statement line items affected by the reclassification. If a component is not required to be reclassified to net income in its entirety, a cross reference to the related footnote for additional information is required. The amendments are effective prospectively for reporting periods beginning after December 15, 2012. The adoption of this guidance did not have a material impact on the Company’s consolidated financial statements.

Note_3_Balance_Sheet_Component

Note 3 - Balance Sheet Components	9 Months Ended
	Sep. 30, 2013
Disclosure Text Block Supplement [Abstract]	'
Supplemental Balance Sheet Disclosures [Text Block]	'
	3. BALANCE SHEET COMPONENTS
	Accounts receivable include amounts that are unbilled at the end of the period. Unbilled accounts receivable are determined on an individual contract basis and were $7.5 million and $7.7 million as of September 30, 2013 and December 31, 2012, respectively.
	Property and equipment consists of (in thousands):
		September 30,			December 31,
		2013			2012
	Property and equipment, net:
	Computer equipment	$	10,964		$	10,319
	Software		3,633			3,552
	Furniture, fixtures and equipment		935			971
	Leasehold improvements		1,045			1,021
	Test equipment		4,555			2,005
	Construction-in-progress		821			864
			21,953			18,732
	Less: accumulated depreciation		(15,688	)		(14,834	)
	Total	$	6,265		$	3,898
	Depreciation and amortization expense was $0.4 million and $0.1 million for the three months ended September 30, 2013 and 2012, respectively. Depreciation and amortization expense was $1.0 million and $0.3 million for the nine months ended September 30, 2013 and 2012, respectively.
	Intangible assets balance was $49,000 and $104,000 as of September 30, 2013 and December 31, 2012, respectively. The balance was included in other non-current assets in the accompanying condensed consolidated balance sheets. For the three months ended September 30, 2013 and 2012, intangible asset amortization expense was $19,000 and $51,000, respectively. For the nine months ended September 30, 2013 and 2012, intangible asset amortization expense was $56,000 and $414,000, respectively. The Company expects the amortization of its existing intangible assets to be $18,000 for the remaining three months in 2013 and $31,000 in 2014.
	Intangible assets are amortized over their useful lives unless these lives are determined to be indefinite. Intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset or asset group may not be recoverable. During the nine months ended September 30, 2013, there were no indicators of impairment related to the Company’s intangible assets.

Note_4_Stockholders_Equity

Note 4 - Stockholders' Equity	9 Months Ended
	Sep. 30, 2013
Disclosure Text Block Supplement [Abstract]	'
Shareholders' Equity and Share-based Payments [Text Block]	'
	4. STOCKHOLDERS’ EQUITY
	Stock-based compensation is estimated at the grant date based on the award’s fair value and is recognized on a straight-line basis over the vesting periods, generally four years. Stock-based compensation expenses before taxes related to the Company’s stock plans and employee stock purchase plan were allocated as follows (in thousands):
		Three Months						Nine Months
		Ended September 30,						Ended September 30,
		2013			2012			2013			2012
	Cost of design-to-silicon yield-solutions	$	812		$	513		$	1,995		$	1,264
	Research and development		484			288			1,143			726
	Selling, general and administrative		628			452			1,804			1,486
	Stock-based compensation expenses	$	1,924		$	1,253		$	4,942		$	3,476
	The Company estimated the fair value of share-based awards granted during the period using the Black-Scholes-Merton option-pricing model with the following weighted average assumptions, resulting in the following weighted average fair values:
	Stock Plans:
		Three Months						Nine Months
		Ended September 30,						Ended September 30,
		2013			2012			2013			2012
	Expected life (in years)		4.78			4.58			4.78			4.82
	Volatility		50.3	%		57.42	%		55.83	%		59.41	%
	Risk-free interest rate		1.31	%		0.66	%		0.94	%		0.77	%
	Expected dividend		—			—			—			—
	Weighted average fair value per share of options granted during the period	$	9.13		$	4.77		$	7.55		$	4.26
	Employee Stock Purchase Plan:
		Three Months						Nine Months
		Ended September 30,						Ended September 30,
		2013			2012			2013			2012
	Expected life (in years)		1.25			1.25			1.25			1.25
	Volatility		41.21	%		51.92	%		45.29	%		51.59	%
	Risk-free interest rate		0.2	%		0.19	%		0.19	%		0.18	%
	Expected dividend		—			—			—			—
	Weighted average fair of purchase rights granted during the period	$	6.95		$	3.46		$	5.56		$	2.99
	On September 30, 2013, the Company has in effect the following stock-based compensation plans:
	Stock Plans — At the annual meeting of stockholders on November 16, 2011, the Company’s stockholders approved the 2011 Stock Incentive Plan (the “2011 Plan”). Under the 2011 Plan, the Company may award stock options, stock appreciation rights, stock grants or stock units covering shares of the Company's common stock to employees, directors, non-employee directors and contractors. The aggregate number of shares reserved for awards under this plan is 3,200,000 shares, plus up to 3,500,000 shares previously issued under the 2001 Plan that are forfeited or repurchased by the Company or shares subject to awards previously issued under the 2001 Plan that expire or that terminate without having been exercised or settled in full on or after November 16, 2011. In case of awards other than options or stock appreciation rights, the aggregate number of shares reserved under the plan will be decreased at a rate of 1.33 shares issued pursuant to such awards. The exercise price for stock options must generally be at prices no less than the fair market value at the date of grant. Stock options generally expire ten years from the date of grant and become vested and exercisable over a four-year period.
	On May 28, 2013, the Company’s stockholders approved the Company’s First Amended and Restated 2011 Stock Incentive Plan to increase the number of authorized shares under such plan by 1,600,000 shares for a total of 4,800,000 shares.
	In 2001, the Company adopted a 2001 Stock Plan (the “2001 Plan”). In 2003, in connection with its acquisition of IDS Systems Inc., the Company assumed IDS’ 2001 Stock Option / Stock Issuance Plan (the “IDS Plan”).  Both of the 2001 and the IDS Plans expired in 2011.  Stock options granted under the 2001 and IDS Plans generally expire ten years from the date of grant and become vested and exercisable over a four-year period. Although no new awards may be granted under the 2001 or IDS Plans, awards made under the 2001 and IDS Plans that are currently outstanding remain subject to the terms of each such plan.
	As of September 30, 2013, 5.2 million shares of common stock were reserved to cover stock-based awards under the 2011 Plan, of which 2.7 million shares were available for future grant. The number of shares reserved and available under the 2011 Plan includes 0.4 million shares that were subject to awards previously made under the 2001 Plan and were forfeited, expired or repurchased by the Company after adoption of the 2011 Plan through September 30, 2013.  As of September 30, 2013, there were no outstanding awards that had been granted outside of the 2011, 2001 or the IDS Plans (collectively, the "Stock Plans").
	Stock option activity under the Company’s Stock Plans during the nine months ended September 30, 2013 was as follows:
		Number of			Weighted			Weighted			Aggregate
		Options			Average			Average			Intrinsic
		(in			Exercise			Remaining			Value
		thousands)			Price			Contractual			(in
					per Share			Term			thousands)
								(years)
	Outstanding, January 1, 2013		3,810		$	6.91
	Granted		65		$	16.07
	Exercised		(682	)	$	6.22
	Canceled		(92	)	$	8.51
	Expired		(18	)	$	5.97
	Outstanding, September 30, 2013		3,083		$	7.21			6.81		$	43,248
	Vested and expected to vest, September 30, 2013		2,942		$	7.14			6.73		$	41,451
	Exercisable, September 30, 2013		1,859		$	6.65			5.85		$	27,108
	The aggregate intrinsic value in the table above represents the total intrinsic value based on the Company’s closing stock price of $21.23 per share as of September 30, 2013, which would have been received by the option holders had all “in-the-money” option holders exercised their options as of that date. The total intrinsic value of options exercised during the nine months ended September 30, 2013 was $8.6 million.
	As of September 30, 2013, there was $4.4 million of total unrecognized compensation cost related to unvested stock options. That cost is expected to be recognized over a weighted average period of 2.22 years. The total fair value of shares vested during the nine months ended September 30, 2013 was $2.3 million.
	Nonvested restricted stock units activity during the nine months ended September 30, 2013 was as follows:
		Shares			Weighted
		(in thousands)			Average
					Grant Date
					Fair Value Per
					Share
	Nonvested, January 1, 2013		450		$	7.97
	Granted		550		$	18.15
	Vested		(90	)	$	8.87
	Forfeited		(22	)	$	8.72
	Nonvested, September 30, 2013		888		$	14.06
	As of September 30, 2013, there was $9.4 million of total unrecognized compensation cost related to nonvested restricted stock units. That cost is expected to be recognized over a weighted average period of 3.0 years.
	Employee Stock Purchase Plan — In July 2001, the Company adopted a ten-year Employee Stock Purchase Plan (“Purchase Plan”) under which eligible employees can contribute up to 10% of their compensation, as defined in the Purchase Plan, towards the purchase of shares of PDF common stock at a price of 85% of the lower of the fair market value at the beginning of the offering period or the end of the purchase period. The Purchase Plan consists of twenty-four-month offering periods with four six-month purchase periods in each offering period. Under the Purchase Plan, on January 1 of each year, starting with 2002, the number of shares reserved for issuance will automatically increase by the lesser of (1) 675,000 shares, (2) 2% of the Company’s outstanding common stock on the last day of the immediately preceding year, or (3) the number of shares determined by the board of directors. At the annual meeting of stockholders on May 18, 2010, the Company’s stockholders approved an amendment to the Purchase Plan to extend it through May 17, 2020.  During the three months and nine months ended September 30, 2013, a total of 80,000 and 184,000 shares, respectively, were issued at a weighted-average purchase price of $9.66 and $7.16 per share, respectively, under the Purchase Plan. During the three months and nine months ended September 30, 2012, a total of 104,000 and 202,000 shares, respectively, were issued at a weighted-average purchase price of $4.89 and $4.85 per share, respectively, under the Purchase Plan. For the three months and nine months ended September 30, 2013, the Purchase Plan compensation expense was $0.1 million and $0.5 million, respectively. For the three months and nine months ended September 30, 2012, the Purchase Plan compensation expense was $0.1 million and $0.3 million, respectively. As of September 30, 2013, there was $0.7 million of unrecognized compensation cost related to the Purchase Plan. That cost is expected to be recognized over a weighted average period of 1.4 years. As of September 30, 2013, 1.3 million shares were available for future issuance under the Purchase Plan.
Stock Repurchase Program — On October 29, 2007, the Board of Directors adopted a program to repurchase up to $10.0 million of the Company’s common stock on the open market. The initial program was for three years, but on October 19, 2010, the Board of Directors authorized an extension of, and an increase in, the program and the aggregate amount available to repurchase between October 19, 2010 and October 29, 2012 was reset to $10.0 million of the Company’s common stock, meaning a total of $19.3 million was available. The program expired on October 29, 2012, as of which date, 3.8 million shares had been repurchased at the average price of $4.53 per share and a total purchase price of $17.0 million. On November 8, 2012, the Board of Directors adopted a new program to repurchase up to $20.0 million of the Company’s common stock on the open market over the next two years. As of September 30, 2013, 36,100 shares had been repurchased at the average price of $13.23 per share under this new program, at a total purchase of $0.5 million, and $19.5 million remained available for future repurchases.

Note_5_Restructuring

Note 5 - Restructuring	9 Months Ended
	Sep. 30, 2013
Restructuring and Related Activities [Abstract]	'
Restructuring and Related Activities Disclosure [Text Block]	'
	5. RESTRUCTURING
	The Company implemented restructuring plans during fiscal years 2012 and 2008, and recorded total restructuring expense of $8,000 and zero for the three months ended on September 30, 2013 and 2012. The Company recorded total restructuring credits of $35,000 for the nine months ended September 30, 2013 and restructuring expense of $83,000 for the nine months ended September 30, 2012. As of September 30, 2013, the remaining restructuring accrual was $49,000, which represents employee severance charges, which the Company expects to pay out by the end of 2013. This remaining accrual balance was included in accrued and other current liabilities in the accompanying consolidated balance sheets.
	October 2012 Plan
	On October 24, 2012, the Company announced a restructuring plan as part of the Company’s continuing efforts to simplify the organization, leverage cross-training and learning, and reduce annual operations expenses. Under this plan, the Company has recorded restructuring charges of $1.8 million, which primarily consisted of employee severance costs of $1.7 million. The following table summarizes the activities of these restructuring liabilities (in thousands) for the periods covered below:
		Three Months			Nine Months
		Ended			Ended
		30-Sep-13			30-Sep-13
	Beginning balance	$	66		$	896
	Restructuring charges (credits)		8			67
	Cash payments		(25	)		(914	)
	Ending balance	$	49		$	49
	October 2008 Plan
	On October 28, 2008, the Company announced a restructuring plan to better allocate its resources to improve its operational results in light of the market conditions. Under this plan, the Company has recorded restructuring charges of $7.4 million, primarily consisting of employee severance costs of $4.7 million and facility exit costs of $2.7 million. The following table summarizes the activities of these restructuring liabilities (in thousands) for the periods covered below:
		Three Months						Nine Months
		Ended September 30,						Ended September 30,
		2013			2012			2013			2012
	Beginning balance	$	105		$	697		$	448		$	728
	Restructuring charges (credits)		—			—			(102	)		83
	Adjustments		—			4			3			170
	Cash payments		(105	)		(134	)		(349	)		(414	)
	Ending balance	$	—		$	567		$	—		$	567

Note_6_Income_Taxes

Note 6 - Income Taxes	9 Months Ended
	Sep. 30, 2013
Income Tax Disclosure [Abstract]	'
Income Tax Disclosure [Text Block]	'
	6. INCOME TAXES
	Income tax provision increased $6.1 million for the nine months ended September 30, 2013 to $7.3 million as compared to an income tax provision of $1.1 million for the nine months ended September 30, 2012.  The Company’s effective tax rate was 34.04% and 7.93% for the nine months ended September 30, 2013 and September 30, 2012, respectively.  The income tax provision for the nine months ended September 30, 2013 was less than the provision at the statutory rate primarily due to changes in unrecognized tax benefits and the benefit of the research and development tax credit. The income tax provision for the nine months ended September 30, 2012 was significantly less than the provision at the statutory rate primarily due to the utilization of U.S. tax credits, offset by foreign withholding taxes, statutory taxes, and changes in unrecognized tax benefits.
	On January 2, 2013, the President signed into law the American Taxpayer Relief Act which reinstated the U.S. Federal Research and Development tax credit retroactive to January 1, 2012 and extended the tax credit through December 31, 2013.  As a result of the new legislation, the Company recognized a benefit in the three months ended March 31, 2013 related to 12 months of fiscal 2012 as well as a benefit to the annual effective tax rate for the full year research tax credit for fiscal 2013.
	The Company’s total amount of unrecognized tax benefits, excluding interest and penalties, as of September 30, 2013 was $9.6 million, of which $5.9 million, if recognized, would affect the Company’s effective tax rate. The Company’s total amount of unrecognized tax benefits, excluding interest and penalties, as of December 31, 2012 was $9.6 million, of which $6.0 million, if recognized, would affect the Company's effective tax rate. As of September 30, 2013, the Company has recorded unrecognized tax benefits of $2.9 million, including interest and penalties, as long-term taxes payable  in its condensed consolidated balance sheet. The remaining $7.2 million has been recorded net of our deferred tax assets, of which $3.7 million is subject to a full valuation allowance.
	As of September 30, 2013, the Company believes that most of its deferred tax assets are “more likely than not” to be realized with the exception of California R&D tax credits that have not met the “more likely than not” realization threshold criteria because on an annual basis and pursuant to current law, the Company generates more California credits than California tax. As a result, at September 30, 2013, the excess California R&D tax credits continue to be subject to a full valuation allowance. In the event the Company concludes at a future financial reporting period that there has been a change in its ability to realize the California R&D credit deferred tax assets, and it is at such time no longer “more likely than not” that the Company will realize the tax credits before applicable expiration dates, the Company’s tax provision will increase in the period in which the Company makes such determination.
	The Company conducts business globally and, as a result, files numerous consolidated and separate income tax returns in the U.S. federal, various state and foreign jurisdictions. Because the Company used some of the tax attributes carried forward from previous years to tax years that are still open, statutes of limitation remain open for all tax years to the extent of the attributes carried forward into tax year 2002 for federal and California tax purposes. The Company is not subject to income tax examinations in any other of its major foreign subsidiaries’ jurisdictions.

Note_7_Net_Income_Per_Share

Note 7 - Net Income Per Share	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Earnings Per Share [Text Block]	'
	7. NET INCOME PER SHARE
	Basic net income per share is computed by dividing net income by weighted average number of common shares outstanding for the period (excluding outstanding stock options and shares subject to repurchase). Diluted net income per share is computed using the weighted-average number of common shares outstanding for the period plus the potential effect of dilutive securities which are convertible into common shares (using the treasury stock method), except in cases in which the effect would be anti-dilutive. Under the treasury stock method, the amount that the employee must pay for exercising stock options, the amount of compensation cost for future service that the Company has not yet recognized, and the amount of the tax benefits that would be recorded in additional paid-in capital when the award becomes deductible are assumed to be used to repurchase shares.  The following is a reconciliation of the numerators and denominators used in computing basic and diluted net income per share (in thousands except per share amount):
		Three Months				Nine Months
		Ended September 30,				Ended September 30,
		2013		2012		2013		2012
	Numerator:
	Net income	$	4,824	$	4,993	$	14,107	$	13,312
	Denominator:
	Basic weighted average common shares outstanding		30,000		28,720		29,668		28,555
	Dilutive effect of equity incentive plans		1,623		1,460		1,530		1,041
	Diluted weighted average common shares outstanding		31,623		30,180		31,198		29,596
	Net income per share:
	Basic	$	0.16	$	0.17	$	0.48	$	0.47
	Diluted	$	0.15	$	0.17	$	0.45	$	0.45
	The following table sets forth potential shares of common stock that are not included in the diluted net income per share calculation above because to do so would be anti-dilutive for the periods indicated (in thousands):
		Three Months				Nine Months
		Ended September 30,				Ended September 30,
		2013		2012		2013		2012
	Outstanding options		60		1,229		48		1,633
	Nonvested restricted stock units		—		9		1		24
	Total		60		1,238		49		1,657

Note_8_Customer_and_Geographic

Note 8 - Customer and Geographic Information	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
Segment Reporting Disclosure [Text Block]	'
	8. CUSTOMER AND GEOGRAPHIC INFORMATION
	Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision maker, or group, in deciding how to allocate resources and in assessing performance.
	The Company’s chief operating decision maker, the chief executive officer, reviews discrete financial information presented on a consolidated basis for purposes of regularly making operating decisions and assessing financial performance. Accordingly, the Company considers itself to be in one operating segment, specifically the licensing and implementation of yield improvement solutions for companies designing and/or manufacturing integrated circuits.
	The Company had revenues from individual customers in excess of 10% of total revenues as follows:
		Three Months						Nine Months
		Ended September 30,						Ended September 30,
	Customer	2013			2012			2013			2012
	A		35	%		11	%		26	%		12	%
	B		28	%		35	%		31	%		39	%
	C		13	%		25	%		17	%		21	%
	The Company had gross accounts receivable from the following individual customers in excess of 10% of gross accounts receivable as follows:
	Customer	30-Sep-13			31-Dec-12
	A		34	%		11	%
	B		30	%		42	%
	C		8	%		18	%
	Revenues from customers by geographic area based on the location of the customers’ work sites are as follows (in thousands):
		Three Months						Nine Months
		Ended September 30,						Ended September 30,
		2013			2012			2013			2012
	Asia		11,752			5,309			28,159			16,642
	United States		7,685			10,877			28,367			26,437
	Europe		6,052			6,365			17,849			22,646
	Total	$	25,489		$	22,551		$	74,375		$	65,725
	Long-lived assets, net by geographic area are as follows (in thousands):
		September 30,			December 31,
		2013			2012
	United States	$	5,773		$	3,527
	Asia		367			295
	Europe		125			76
	Total long-lived assets, net	$	6, 265		$	3,898

Note_9_Fair_Value_Measurements

Note 9 - Fair Value Measurements	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Fair Value Disclosures [Text Block]	'
	9. FAIR VALUE MEASUREMENTS
	Fair value is the exit price, or the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants as of the measurement date. The multiple assumptions used to value financial instruments are referred to as inputs, and a hierarchy for inputs used in measuring fair value is established, that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs reflect assumptions market participants would use in pricing an asset or liability based on market data obtained from independent sources while unobservable inputs reflect a reporting entity’s pricing based upon its own market assumptions. These inputs are ranked according to a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels.
	Level 1 -	Inputs are quoted prices in active markets for identical assets or liabilities.
	Level 2 -	Inputs are quoted prices for similar assets or liabilities in an active market, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable and market-corroborated inputs which are derived principally from or corroborated by observable market data.
	Level 3 -	Inputs are derived from valuation techniques in which one or more significant inputs or value drivers are unobservable.
	The following table represents the Company’s assets measured at fair value on a recurring basis as of September 30, 2013 and the basis for that measurement (in thousands):
	Assets		Total		Quoted Prices		Significant		Significant
					in		Other		Unobservable
					Active Markets		Observable		Inputs
					for		Inputs		(Level 3)
					Identical Assets		(Level 2)
					(Level 1)
	Money market mutual funds		$	26,352	$	26,352	$	—	$	—
	The following table represents the Company’s assets measured at fair value on a recurring basis as of December 31, 2012 and the basis for that measurement (in thousands):
	Assets		Total		Quoted Prices		Significant		Significant
					in		Other		Unobservable
					Active Markets		Observable		Inputs
					for		Inputs		(Level 3)
					Identical Assets		(Level 2)
					(Level 1)
	Money market mutual funds		$	26,341	$	26,341	$	—	$	—

Note_10_Commitments_and_Contin

Note 10 - Commitments and Contingencies	9 Months Ended
	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies Disclosure [Text Block]	'
	10. COMMITMENTS AND CONTINGENCIES
	Leases
	The Company leases administrative and sales offices and certain equipment under noncancelable operating leases, which contain various renewal options and, in some cases, require payment of common area costs, taxes and utilities. These operating leases expire at various times through 2018. Rent expense was $0.5 million for both the three months ended September 30, 2013 and 2012, respectively. Rent expense was $1.5 million and $1.7 million for the nine months ended September 30, 2013 and 2012, respectively.
	Future minimum lease payments under noncancelable operating leases at September 30, 2013 are as follows (in thousands):
	Year Ending December 31,	Amount
	2013 (remaining three months)	$	446
	2014		1,655
	2015		1,571
	2016		1,574
	2017		1,294
	Thereafter		695
	Total future minimum lease payments	$	7,235
	Litigation  — From time to time, the Company is subject to various claims and legal proceedings that arise in the ordinary course of business. The Company accrues for losses related to litigation when a potential loss is probable and the loss can be reasonably estimated in accordance with FASB requirements. During the reported period, the Company was not party to any material legal proceedings, thus no loss was probable and no amount was accrued at September 30, 2013.

Accounting_Policies_by_Policy_

Accounting Policies, by Policy (Policies)	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Basis of Accounting, Policy [Policy Text Block]	'
	Basis of Presentation
	The interim unaudited condensed consolidated financial statements included herein have been prepared by PDF Solutions, Inc. (“the Company”) pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”), including the instructions to the Quarterly Report on Form 10-Q and Article 10 of Regulation S-X. Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted. The interim unaudited condensed consolidated financial statements reflect, in the opinion of management, all adjustments necessary (consisting only of normal recurring adjustments), to present a fair statement of results for the interim periods presented. The operating results for any interim period are not necessarily indicative of the results that may be expected for other interim periods or the full fiscal year. The accompanying interim unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto in the Company’s Annual Report on Form 10-K for the year ended December 31, 2012.
	The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries after the elimination of all significant intercompany balances and transactions.
	The condensed consolidated balance sheet at December 31, 2012  has been derived from the audited consolidated financial statements but does not include all disclosures required by accounting principles generally accepted in the United States of America.
Use of Estimates, Policy [Policy Text Block]	'
	Use of Estimates  —  The preparation of financial statements in conformity with generally accepted accounting principles in the United States (“U.S. GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Significant estimates in these financial statements include stock-based compensation expense, allowances for doubtful accounts receivable, estimates for useful lives associated with long-lived assets, restructuring charges, fair value of financial instruments and income taxes and tax valuation allowances. Actual results could differ from those estimates.
Revenue Recognition, Policy [Policy Text Block]	'
	Revenue Recognition  — The Company derives revenue from two sources: Design-to-silicon-yield solutions and Gainshare performance incentives.
	Design-to-Silicon-Yield Solutions — Revenue that is derived from Design-to-silicon-yield solutions comes from services and software licenses. The Company recognizes revenue of Design-to-silicon-yield solutions as follows:
	The Company generates a significant portion of its Design-to-silicon-yield solutions revenue from fixed-price solution implementation service contracts delivered over a specific period of time. These contracts require reliable estimation of costs to perform obligations and the overall scope of each engagement. Revenue under project–based contracts for solution implementation services is recognized as services are performed using the cost-to-cost percentage of completion method of contract accounting. Losses on fixed-price solution implementation contracts are recognized in the period when they become probable. Revisions in profit estimates are reflected in the period in which the conditions that require the revisions become known and can be estimated. Revenue under time and materials contracts for solution implementation services are recognized as the services are performed. On occasion, the Company licenses its software products as a component of its fixed-price service contracts. In such instances, the software products are licensed to customers over a specified term of the agreement with support and maintenance to be provided at each customer's option over the license term. The amount of product and service revenue recognized in a given period is affected by the Company’s judgment as to whether an arrangement includes multiple deliverables and, if so, the Company’s determination of the fair value of each deliverable. In general, vendor-specific objective evidence of selling price (“VSOE”) does not exist for the Company’s solution implementation services and software products and because the Company’s services and products include our unique technology, the Company is not able to determine third-party evidence of selling price (“TPE”). Therefore, in such circumstances the Company uses best estimated selling prices (“BESP”) in the allocation of arrangement consideration. In determining BESP, the Company applies significant judgment as the Company’s weighs a variety of factors, based on the facts and circumstances of the arrangement. The Company typically arrives at BESP for a product or service that is not sold separately by considering company-specific factors such as geographies, internal costs, gross margin objectives, pricing practices used to establish bundled pricing, and existing portfolio pricing and discounting. After fair value is established for each deliverable, the total transaction amount is allocated to each deliverable based upon its relative fair value. Fees allocated to solution implementation services are recognized using the cost-to-cost percentage of completion method of contract accounting. Fees allocated to software and related support and maintenance are recognized under software revenue recognition guidance.
	The Company also licenses its software products separately from its solution implementations. For software license arrangements that do not require significant modification or customization of the underlying software, software license revenue is recognized under the residual method when (1) persuasive evidence of an arrangement exists, (2) delivery has occurred, (3) the fee is fixed or determinable, (4) collectability is probable, and (5) the arrangement does not require services that are essential to the functionality of the software. When arrangements include multiple elements such as support and maintenance, consulting (other than for its fixed price solution implementations), installation, and training, revenue is allocated to each element of a transaction based upon its fair value as determined by the Company’s VSOE and such services are recorded as services revenue. VSOE for maintenance is generally established based upon negotiated renewal rates while VSOE for consulting, installation, and training services is established based upon the Company’s customary pricing for such services when sold separately. Revenue for software licenses with extended payment terms is not recognized in excess of amounts due. For software license arrangements that require significant modification or customization of the underlying software, the software license revenue is recognized as services are performed using the cost-to-cost percentage of completion method of contract accounting, and such revenue is recorded as services revenue.

Note_3_Balance_Sheet_Component1

Note 3 - Balance Sheet Components (Tables)	9 Months Ended
	Sep. 30, 2013
Disclosure Text Block Supplement [Abstract]	'
Property, Plant and Equipment [Table Text Block]	'
		September 30,			December 31,
		2013			2012
	Property and equipment, net:
	Computer equipment	$	10,964		$	10,319
	Software		3,633			3,552
	Furniture, fixtures and equipment		935			971
	Leasehold improvements		1,045			1,021
	Test equipment		4,555			2,005
	Construction-in-progress		821			864
			21,953			18,732
	Less: accumulated depreciation		(15,688	)		(14,834	)
	Total	$	6,265		$	3,898

Note_4_Stockholders_Equity_Tab

Note 4 - Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2013
Disclosure Text Block Supplement [Abstract]	'
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]	'
		Three Months						Nine Months
		Ended September 30,						Ended September 30,
		2013			2012			2013			2012
	Cost of design-to-silicon yield-solutions	$	812		$	513		$	1,995		$	1,264
	Research and development		484			288			1,143			726
	Selling, general and administrative		628			452			1,804			1,486
	Stock-based compensation expenses	$	1,924		$	1,253		$	4,942		$	3,476
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	'
		Three Months						Nine Months
		Ended September 30,						Ended September 30,
		2013			2012			2013			2012
	Expected life (in years)		4.78			4.58			4.78			4.82
	Volatility		50.3	%		57.42	%		55.83	%		59.41	%
	Risk-free interest rate		1.31	%		0.66	%		0.94	%		0.77	%
	Expected dividend		—			—			—			—
	Weighted average fair value per share of options granted during the period	$	9.13		$	4.77		$	7.55		$	4.26
		Three Months						Nine Months
		Ended September 30,						Ended September 30,
		2013			2012			2013			2012
	Expected life (in years)		1.25			1.25			1.25			1.25
	Volatility		41.21	%		51.92	%		45.29	%		51.59	%
	Risk-free interest rate		0.2	%		0.19	%		0.19	%		0.18	%
	Expected dividend		—			—			—			—
	Weighted average fair of purchase rights granted during the period	$	6.95		$	3.46		$	5.56		$	2.99
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]	'
		Number of			Weighted			Weighted			Aggregate
		Options			Average			Average			Intrinsic
		(in			Exercise			Remaining			Value
		thousands)			Price			Contractual			(in
					per Share			Term			thousands)
								(years)
	Outstanding, January 1, 2013		3,810		$	6.91
	Granted		65		$	16.07
	Exercised		(682	)	$	6.22
	Canceled		(92	)	$	8.51
	Expired		(18	)	$	5.97
	Outstanding, September 30, 2013		3,083		$	7.21			6.81		$	43,248
	Vested and expected to vest, September 30, 2013		2,942		$	7.14			6.73		$	41,451
	Exercisable, September 30, 2013		1,859		$	6.65			5.85		$	27,108
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]	'
		Shares			Weighted
		(in thousands)			Average
					Grant Date
					Fair Value Per
					Share
	Nonvested, January 1, 2013		450		$	7.97
	Granted		550		$	18.15
	Vested		(90	)	$	8.87
	Forfeited		(22	)	$	8.72
	Nonvested, September 30, 2013		888		$	14.06

Note_5_Restructuring_Tables

Note 5 - Restructuring (Tables)	9 Months Ended
	Sep. 30, 2013
October 2012 Plan [Member]	'
Note 5 - Restructuring (Tables) [Line Items]	'
Restructuring and Related Costs [Table Text Block]	'
		Three Months			Nine Months
		Ended			Ended
		30-Sep-13			30-Sep-13
	Beginning balance	$	66		$	896
	Restructuring charges (credits)		8			67
	Cash payments		(25	)		(914	)
	Ending balance	$	49		$	49
October 2008 Plan [Member]	'
Note 5 - Restructuring (Tables) [Line Items]	'
Restructuring and Related Costs [Table Text Block]	'
		Three Months						Nine Months
		Ended September 30,						Ended September 30,
		2013			2012			2013			2012
	Beginning balance	$	105		$	697		$	448		$	728
	Restructuring charges (credits)		—			—			(102	)		83
	Adjustments		—			4			3			170
	Cash payments		(105	)		(134	)		(349	)		(414	)
	Ending balance	$	—		$	567		$	—		$	567

Note_7_Net_Income_Per_Share_Ta

Note 7 - Net Income Per Share (Tables)	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	'
		Three Months				Nine Months
		Ended September 30,				Ended September 30,
		2013		2012		2013		2012
	Numerator:
	Net income	$	4,824	$	4,993	$	14,107	$	13,312
	Denominator:
	Basic weighted average common shares outstanding		30,000		28,720		29,668		28,555
	Dilutive effect of equity incentive plans		1,623		1,460		1,530		1,041
	Diluted weighted average common shares outstanding		31,623		30,180		31,198		29,596
	Net income per share:
	Basic	$	0.16	$	0.17	$	0.48	$	0.47
	Diluted	$	0.15	$	0.17	$	0.45	$	0.45
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]	'
		Three Months				Nine Months
		Ended September 30,				Ended September 30,
		2013		2012		2013		2012
	Outstanding options		60		1,229		48		1,633
	Nonvested restricted stock units		—		9		1		24
	Total		60		1,238		49		1,657

Note_8_Customer_and_Geographic1

Note 8 - Customer and Geographic Information (Tables)	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
Disclosure on Geographic Areas, Description of Revenue from External Customers	'
		Three Months						Nine Months
		Ended September 30,						Ended September 30,
	Customer	2013			2012			2013			2012
	A		35	%		11	%		26	%		12	%
	B		28	%		35	%		31	%		39	%
	C		13	%		25	%		17	%		21	%
Disclosure on Geographic Areas, Long-Lived Assets	'
	Customer	30-Sep-13			31-Dec-12
	A		34	%		11	%
	B		30	%		42	%
	C		8	%		18	%
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]	'
		Three Months						Nine Months
		Ended September 30,						Ended September 30,
		2013			2012			2013			2012
	Asia		11,752			5,309			28,159			16,642
	United States		7,685			10,877			28,367			26,437
	Europe		6,052			6,365			17,849			22,646
	Total	$	25,489		$	22,551		$	74,375		$	65,725
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]	'
		September 30,			December 31,
		2013			2012
	United States	$	5,773		$	3,527
	Asia		367			295
	Europe		125			76
	Total long-lived assets, net	$	6, 265		$	3,898

Note_9_Fair_Value_Measurements1

Note 9 - Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Fair Value, Assets Measured on Recurring Basis [Table Text Block]	'
	Assets	Total		Quoted Prices		Significant		Significant
				in		Other		Unobservable
				Active Markets		Observable		Inputs
				for		Inputs		(Level 3)
				Identical Assets		(Level 2)
				(Level 1)
	Money market mutual funds	$	26,352	$	26,352	$	—	$	—
	Assets	Total		Quoted Prices		Significant		Significant
				in		Other		Unobservable
				Active Markets		Observable		Inputs
				for		Inputs		(Level 3)
				Identical Assets		(Level 2)
				(Level 1)
	Money market mutual funds	$	26,341	$	26,341	$	—	$	—

Note_10_Commitments_and_Contin1

Note 10 - Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	'
	Year Ending December 31,	Amount
	2013 (remaining three months)	$	446
	2014		1,655
	2015		1,571
	2016		1,574
	2017		1,294
	Thereafter		695
	Total future minimum lease payments	$	7,235

Note_3_Balance_Sheet_Component2

Note 3 - Balance Sheet Components (Details) (USD $)	3 Months Ended		9 Months Ended		21 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Dec. 31, 2012
Disclosure Text Block Supplement [Abstract]	'	'	'	'	'	'
Unbilled Receivables, Current	$7,500,000	'	$7,500,000	'	$7,500,000	$7,700,000
Depreciation, Depletion and Amortization, Nonproduction	400,000	100,000	1,000,000	300,000	'	'
Intangible Assets, Net (Excluding Goodwill)	49,000	'	49,000	'	49,000	104,000
Amortization of Intangible Assets	19,000	51,000	56,000	413,000	414,000	'
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	18,000	'	18,000	'	18,000	'
Finite-Lived Intangible Assets, Amortization Expense, Year Two	$31,000	'	$31,000	'	$31,000	'

Note_3_Balance_Sheet_Component3

Note 3 - Balance Sheet Components (Details) - Property and Equipment (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Property and Equipment [Abstract]	'	'
Computer equipment	$10,964	$10,319
Software	3,633	3,552
Furniture, fixtures and equipment	935	971
Leasehold improvements	1,045	1,021
Test equipment	4,555	2,005
Construction-in-progress	821	864
	21,953	18,732
Less: accumulated depreciation	-15,688	-14,834
Total	$6,265	$3,898

Note_4_Stockholders_Equity_Det

Note 4 - Stockholders' Equity (Details) (USD $)

0 Months Ended

1 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

3 Months Ended

9 Months Ended

1 Months Ended

25 Months Ended

22 Months Ended

Nov. 08, 2012

28-May-13

Oct. 29, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Nov. 16, 2011

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Oct. 29, 2007

Oct. 29, 2012

Sep. 30, 2013

Sep. 30, 2013

Employee Stock Purchase Plan [Member]

Employee Stock Purchase Plan [Member]

Employee Stock Purchase Plan [Member]

Employee Stock Purchase Plan [Member]

2011 Stock Incentive Plan [Member]

IDS Plan [Member]

Employee Stock Option [Member]

Restricted Stock [Member]

Employee Stock Purchase Plan [Member]

Stock Repurchase Program [Member]

Stock Repurchase Program [Member]

2001 Stock Incentive Plan [Member]

Shares Previously Issued Under the 2001 Plan [Member]

Note 4 - Stockholders' Equity (Details) [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period

'

'

'

'

'

'4 years

'

'

'

'

'

'

'

'4 years

'4 years

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized

'

4,800,000

'

'

'

'

'

'

3,200,000

'

'

'

'

'

'

'

'

'

'

'

'

3,500,000

Share Based Compensation Arrangement By Share Based Payment Award Shares Reserved Decrease Rate

'

'

'

'

'

1.33

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share Based Compensation Arrangement By Share Based Payment Award Expiration Term

'

'

'

'

'

'

'

'

'

'

'

'

'

'10 years

'10 years

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized

'

1,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common Stock, Capital Shares Reserved for Future Issuance

'

'

'

5,200,000

'

5,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant

'

'

'

2,700,000

'

2,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period

'

'

'

'

'

92,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

400,000

'

Share Price (in Dollars per share)

'

'

'

$21.23

'

$21.23

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value (in Dollars)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$8,600,000

'

'

'

'

'

'

Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4,400,000

'

'

'

'

'

'

Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'2 years 80 days

'3 years

'1 year 146 days

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value (in Dollars)

'

'

'

'

'

2,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options (in Dollars)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

9,400,000

700,000

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate

'

'

'

10.00%

'

10.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent

'

'

'

'

'

85.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

ESPP Maximum Annual Share Replenishment

'

'

'

'

'

675,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

ESPP Maximum Annual Share Replenishment Percentage Of Prior Year Outstanding Company Common Stock

'

'

'

'

'

'

'

2.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock Issued During Period, Shares, Employee Stock Purchase Plans

'

'

'

80,000

104,000

184,000

202,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Employee Stock Purchase Plan Weighted Average Purchase Price Of Shares Purchased (in Dollars per share)

'

'

'

$9.66

$4.89

$7.16

$4.85

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation (in Dollars)

'

'

'

'

'

4,942,000

3,476,000

'

'

100,000

100,000

500,000

300,000

'

'

'

'

'

'

'

'

'

Number Of ESPP Shares Available For Future Issuance

'

'

'

'

'

'

'

'

'

1,300,000

'

1,300,000

'

'

'

'

'

'

'

'

'

'

Stock Repurchase Program, Authorized Amount (in Dollars)

20,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

10,000,000

10,000,000

'

'

Stock Repurchase Program, Remaining Authorized Repurchase Amount (in Dollars)

'

'

'

'

'

19,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

19,300,000

'

'

Stock Repurchased During Period, Shares

'

'

3,800,000

'

'

36,100

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Treasury Stock Acquired, Average Cost Per Share (in Dollars per share)

'

'

$4.53

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Treasury Stock, Value, Acquired, Cost Method (in Dollars)

'

'

17,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock Repurchsed During Period Average Per Share Price (in Dollars per share)

'

'

'

'

'

$13.23

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock Repurchased During Period, Value (in Dollars)

'

'

'

'

'

$500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Note_4_Stockholders_Equity_Det1

Note 4 - Stockholders' Equity (Details) - Allocation of Recognized Period Costs (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Allocation of Recognized Period Costs	$1,924	$1,253	$4,942	$3,476
Cost of Sales [Member]	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Allocation of Recognized Period Costs	812	513	1,995	1,264
Research and Development Expense [Member]	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Allocation of Recognized Period Costs	484	288	1,143	726
Selling, General and Administrative Expenses [Member]	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Allocation of Recognized Period Costs	$628	$452	$1,804	$1,486

Note_4_Stockholders_Equity_Det2

Note 4 - Stockholders' Equity (Details) - Stock Options, Valuation Assumptions (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Note 4 - Stockholders' Equity (Details) - Stock Options, Valuation Assumptions [Line Items]	'	'	'	'
Expected life (in years)	'	'	'1 year 3 months	'1 year 3 months
Volatility	'	'	45.29%	51.59%
Risk-free interest rate	'	'	0.19%	0.18%
Weighted average fair value per share of options granted during the period (in Dollars per share)	'	'	$5.56	$2.99
Employee Stock Option [Member]	'	'	'	'
Note 4 - Stockholders' Equity (Details) - Stock Options, Valuation Assumptions [Line Items]	'	'	'	'
Expected life (in years)	'4 years 284 days	'4 years 211 days	'4 years 284 days	'4 years 299 days
Volatility	50.30%	57.42%	55.83%	59.41%
Risk-free interest rate	1.31%	0.66%	0.94%	0.77%
Expected dividend	0.00%	0.00%	0.00%	0.00%
Weighted average fair value per share of options granted during the period (in Dollars per share)	$9.13	$4.77	$7.55	$4.26
Employee Stock Purchase Plan [Member]	'	'	'	'
Note 4 - Stockholders' Equity (Details) - Stock Options, Valuation Assumptions [Line Items]	'	'	'	'
Expected life (in years)	'1 year 3 months	'1 year 3 months	'	'
Volatility	41.21%	51.92%	'	'
Risk-free interest rate	0.20%	0.19%	'	'
Expected dividend	0.00%	0.00%	'	'
Weighted average fair value per share of options granted during the period (in Dollars per share)	$6.95	$3.46	'	'

Note_4_Stockholders_Equity_Det3

Note 4 - Stockholders' Equity (Details) - Stock Options Activity (USD $)	9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013
Stock Options Activity [Abstract]	'
Outstanding - Number of Options	3,810
Outstanding - Weighted Average Exercise Price per Share (in Dollars per share)	$6.91
Outstanding - Weighted Average Remaining Contractual Term	'6 years 295 days
Vested and expected to vest, September 30, 2013	2,942
Vested and expected to vest, September 30, 2013 (in Dollars per share)	$7.14
Vested and expected to vest, September 30, 2013	'6 years 266 days
Vested and expected to vest, September 30, 2013 (in Dollars)	$41,451
Exercisable, September 30, 2013	1,859
Exercisable, September 30, 2013 (in Dollars per share)	$6.65
Exercisable, September 30, 2013	'5 years 310 days
Exercisable, September 30, 2013 (in Dollars)	27,108
Expired	-18
Expired (in Dollars per share)	$5.97
Granted	65
Granted (in Dollars per share)	$16.07
Exercised	-682
Exercised (in Dollars per share)	$6.22
Canceled	-92
Canceled (in Dollars per share)	$8.51
Outstanding - Number of Options	3,083
Outstanding - Weighted Average Exercise Price per Share (in Dollars per share)	$7.21
Outstanding - Aggregate Intrinsic Value (in Dollars)	$43,248

Note_4_Stockholders_Equity_Det4

Note 4 - Stockholders' Equity (Details) - Nonvested Restricted Stock Units Activity (USD $)	9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013
Nonvested Restricted Stock Units Activity [Abstract]	'
Nonvested Balance, Shares	450
Nonvested Balance, Weighted-Average Grant-Date Fair Value (in Dollars per share)	$7.97
Granted	550
Granted (in Dollars per share)	$18.15
Vested	-90
Vested (in Dollars per share)	$8.87
Forfeited	-22
Forfeited (in Dollars per share)	$8.72
Nonvested Balance, Shares	888
Nonvested Balance, Weighted-Average Grant-Date Fair Value (in Dollars per share)	$14.06

Note_5_Restructuring_Details

Note 5 - Restructuring (Details) (USD $)

3 Months Ended

9 Months Ended

12 Months Ended

60 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

60 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Jun. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Jun. 30, 2013

Dec. 31, 2012

Jun. 30, 2012

Dec. 31, 2011

Employee Severance [Member]

Employee Severance [Member]

Facility Closing [Member]

October 2012 Plan [Member]

October 2012 Plan [Member]

October 2012 Plan [Member]

October 2012 Plan [Member]

October 2012 Plan [Member]

October 2008 Plan [Member]

October 2008 Plan [Member]

October 2008 Plan [Member]

October 2008 Plan [Member]

October 2008 Plan [Member]

October 2008 Plan [Member]

October 2008 Plan [Member]

October 2012 Plan [Member]

October 2008 Plan [Member]

October 2008 Plan [Member]

Note 5 - Restructuring (Details) [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Restructuring Charges

$8,000

$0

($35,000)

$83,000

'

'

'

$8,000

$67,000

'

'

'

$102,000

($83,000)

'

'

'

'

'

Restructuring Reserve

49,000

'

49,000

'

'

'

'

49,000

49,000

49,000

66,000

896,000

'

567,000

'

105,000

448,000

697,000

728,000

Restructuring and Related Cost, Cost Incurred to Date

'

'

'

'

$1,700,000

$4,700,000

$2,700,000

'

'

$1,800,000

'

'

'

'

$7,400,000

'

'

'

'

Note_5_Restructuring_Details_S

Note 5 - Restructuring (Details) - Summary of Restructuring Liabilities (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Ending balance	$49,000	'	$49,000	'
Restructuring charges (credits)	8,000	0	-35,000	83,000
October 2012 Plan [Member]	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Beginning balance	66,000	'	896,000	'
Ending balance	49,000	'	49,000	'
Restructuring charges (credits)	8,000	'	67,000	'
Cash payments	($25,000)	'	($914,000)	'

Note_5_Restructuring_Details_S1

Note 5 - Restructuring (Details) - Summary of Restructuring Liabilities (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Restructuring charges (credits)	($8,000)	$0	$35,000	($83,000)
Ending balance	49,000	'	49,000	'
October 2008 Plan [Member]	'	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'	'
Beginning balance	105,000	697,000	448,000	728,000
Restructuring charges (credits)	'	'	-102,000	83,000
Adjustments	'	4,000	3,000	170,000
Cash payments	-105,000	-134,000	-349,000	-414,000
Ending balance	'	$567,000	'	$567,000

Note_6_Income_Taxes_Details

Note 6 - Income Taxes (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Income Tax Disclosure [Abstract]	'	'	'	'	'
Income Tax Expense Benefit Period Increase Decrease	'	'	$6,100,000	'	'
Income Tax Expense (Benefit)	2,640,000	170,000	7,279,000	1,147,000	'
Effective Income Tax Rate Reconciliation, Percent	'	'	'	7.93%	'
Unrecognized Tax Benefits	9,600,000	'	9,600,000	'	9,600,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	5,900,000	'	5,900,000	'	6,000,000
Unrecognized Tax Benefits In Long Term Liabilities	2,900,000	'	2,900,000	'	'
Unrecognized Tax Benefits In Deferred Tax Assets	7,200,000	'	7,200,000	'	'
Unrecognized Tax Benefits In Deferred Tax Asset Subject To Full Valuation Allowance	$3,700,000	'	$3,700,000	'	'

Note_7_Net_Income_Per_Share_De

Note 7 - Net Income Per Share (Details) - Calculation of Earnings Per Share (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Calculation of Earnings Per Share [Abstract]	'	'	'	'
Net income (in Dollars)	$4,824	$4,993	$14,107	$13,312
Basic weighted average common shares outstanding	30,000	28,720	29,668	28,555
Dilutive effect of equity incentive plans	1,623	1,460	1,530	1,041
Diluted weighted average common shares outstanding	31,623	30,180	31,198	29,596
Net income per share:	'	'	'	'
Basic (in Dollars per share)	$0.16	$0.17	$0.48	$0.47
Diluted (in Dollars per share)	$0.15	$0.17	$0.45	$0.45

Note_7_Net_Income_Per_Share_De1

Note 7 - Net Income Per Share (Details) - Antidilutive Securities	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Antidilutive Securities	60	1,238	49	1,657
Equity Option [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Antidilutive Securities	60	1,229	48	1,633
Restricted Stock [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Antidilutive Securities	'	9	1	24

Note_8_Customer_and_Geographic2

Note 8 - Customer and Geographic Information (Details)	9 Months Ended
	Sep. 30, 2013
Note 8 - Customer and Geographic Information (Details) [Line Items]	'
Number of Operating Segments	1
Customer Concentration Risk [Member]	'
Note 8 - Customer and Geographic Information (Details) [Line Items]	'
Concentration Risk, Percentage	10.00%
Accounts Receivable [Member]	'
Note 8 - Customer and Geographic Information (Details) [Line Items]	'
Concentration Risk, Percentage	10.00%

Note_8_Customer_and_Geographic3

Note 8 - Customer and Geographic Information (Details) - Revenue Percentage by Major Customers	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Customer A [Member]	'	'	'	'
Note 8 - Customer and Geographic Information (Details) - Revenue Percentage by Major Customers [Line Items]	'	'	'	'
Revenue Percentage by Major Customers	35.00%	11.00%	26.00%	12.00%
Customer B [Member]	'	'	'	'
Note 8 - Customer and Geographic Information (Details) - Revenue Percentage by Major Customers [Line Items]	'	'	'	'
Revenue Percentage by Major Customers	28.00%	35.00%	31.00%	39.00%
Customer C [Member]	'	'	'	'
Note 8 - Customer and Geographic Information (Details) - Revenue Percentage by Major Customers [Line Items]	'	'	'	'
Revenue Percentage by Major Customers	13.00%	25.00%	17.00%	21.00%

Note_8_Customer_and_Geographic4

Note 8 - Customer and Geographic Information (Details) - Receivables Percentage by Major Customers	Sep. 30, 2013	Dec. 31, 2012
Customer A [Member]	'	'
Note 8 - Customer and Geographic Information (Details) - Receivables Percentage by Major Customers [Line Items]	'	'
Accounts Receivable Percentage by Major Customers	34.00%	11.00%
Customer B [Member]	'	'
Note 8 - Customer and Geographic Information (Details) - Receivables Percentage by Major Customers [Line Items]	'	'
Accounts Receivable Percentage by Major Customers	30.00%	42.00%
Customer C [Member]	'	'
Note 8 - Customer and Geographic Information (Details) - Receivables Percentage by Major Customers [Line Items]	'	'
Accounts Receivable Percentage by Major Customers	8.00%	18.00%

Note_8_Customer_and_Geographic5

Note 8 - Customer and Geographic Information (Details) - Revenue by Geographical Areas (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Note 8 - Customer and Geographic Information (Details) - Revenue by Geographical Areas [Line Items]	'	'	'	'
	$25,489	$22,551	$74,375	$65,725
Asia [Member]	'	'	'	'
Note 8 - Customer and Geographic Information (Details) - Revenue by Geographical Areas [Line Items]	'	'	'	'
	11,752	5,309	28,159	16,642
United States [Member]	'	'	'	'
Note 8 - Customer and Geographic Information (Details) - Revenue by Geographical Areas [Line Items]	'	'	'	'
	7,685	10,877	28,367	26,437
Europe [Member]	'	'	'	'
Note 8 - Customer and Geographic Information (Details) - Revenue by Geographical Areas [Line Items]	'	'	'	'
	$6,052	$6,365	$17,849	$22,646

Note_8_Customer_and_Geographic6

Note 8 - Customer and Geographic Information (Details) - Long-lived Assets, by Geographical Areas (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Note 8 - Customer and Geographic Information (Details) - Long-lived Assets, by Geographical Areas [Line Items]	'	'
Long-lived assets net, by geographical areas	$6,265	$3,898
United States [Member]	'	'
Note 8 - Customer and Geographic Information (Details) - Long-lived Assets, by Geographical Areas [Line Items]	'	'
Long-lived assets net, by geographical areas	5,773	3,527
Asia [Member]	'	'
Note 8 - Customer and Geographic Information (Details) - Long-lived Assets, by Geographical Areas [Line Items]	'	'
Long-lived assets net, by geographical areas	367	295
Europe [Member]	'	'
Note 8 - Customer and Geographic Information (Details) - Long-lived Assets, by Geographical Areas [Line Items]	'	'
Long-lived assets net, by geographical areas	$125	$76

Note_9_Fair_Value_Measurements2

Note 9 - Fair Value Measurements (Details) - Fair Value, Assets Measured on Recurring Basis (Money Market Mutual Funds [Member], USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Note 9 - Fair Value Measurements (Details) - Fair Value, Assets Measured on Recurring Basis [Line Items]	'	'
Assets at fair value	$26,352	$26,341
Fair Value, Inputs, Level 1 [Member]	'	'
Note 9 - Fair Value Measurements (Details) - Fair Value, Assets Measured on Recurring Basis [Line Items]	'	'
Assets at fair value	$26,352	$26,341

Note_10_Commitments_and_Contin2

Note 10 - Commitments and Contingencies (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Commitments and Contingencies Disclosure [Abstract]	'	'	'	'
Operating Leases, Rent Expense, Net	$0.50	$0.50	$1.50	$1.70

Note_10_Commitments_and_Contin3

Note 10 - Commitments and Contingencies (Details) - Future Minimum Lease Payments Under Noncancelable Operating Leases (USD $)	Sep. 30, 2013
In Thousands, unless otherwise specified
Future Minimum Lease Payments Under Noncancelable Operating Leases [Abstract]	'
2013 (remaining three months)	$446
2014	1,655
2015	1,571
2016	1,574
2017	1,294
Thereafter	695
Total future minimum lease payments	$7,235