PDF Solutions (PDFS) 10-K 14 Mar 14 2013 FY Annual report Financial data

Document_And_Entity_Informatio

Document And Entity Information (USD $)	12 Months Ended
	Dec. 31, 2013	Mar. 10, 2014	Jun. 30, 2013
Document and Entity Information [Abstract]	'	'	'
Entity Registrant Name	'PDF SOLUTIONS INC	'	'
Document Type	'10-K	'	'
Current Fiscal Year End Date	'--12-31	'	'
Entity Common Stock, Shares Outstanding	'	30,584,896	'
Entity Public Float	'	'	$346,700,000
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	31-Dec-13	'	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$89,371	$61,637
Accounts receivable, net of allowances of $354 and $351, respectively	34,860	33,959
Deferred tax assets - current portion	5,920	3,589
Prepaid expenses and other current assets	3,632	3,413
Total current assets	133,783	102,598
Property and equipment, net	7,064	3,898
Intangible assets, net	31	104
Deferred tax assets - long-term portion	8,599	16,471
Other non-current assets	1,687	1,189
Total assets	151,164	124,260
Current liabilities:	'	'
Accounts payable	1,129	2,054
Accrued compensation and related benefits	7,707	10,723
Accrued and other current liabilities	1,593	2,882
Deferred revenues - current portion	2,096	3,232
Billings in excess of recognized revenues	343	807
Total current liabilities	12,868	19,698
Long-term income taxes payable	2,956	3,222
Other non-current liabilities	628	280
Total liabilities	16,452	23,200
Commitments and contingencies (Note 6)	'	'
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 35,285 and 34,027, respectively; shares outstanding 30,437 and 29,226, respectively	5	4
Additional paid-in capital	233,813	220,361
Treasury stock, at cost, 4,848 and 4,801 shares, respectively	-28,905	-27,778
Accumulated deficit	-70,649	-91,578
Accumulated other comprehensive income	448	51
Total stockholders’ equity	134,712	101,060
Total liabilities and stockholders’ equity	$151,164	$124,260

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parentheticals) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, except Per Share data, unless otherwise specified
Accounts receivable, allowances (in Dollars)	$354	$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	35,285	34,027
Common stock, shares outstanding	30,437	29,226
Treasury stock shares	4,848	4,801

Consolidated_Statements_of_Ope

Consolidated Statements of Operations and Comprehensive Income (Loss) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Design-to-silicon-yield solutions	$61,710	$59,061	$51,633
Gainshare performance incentives	39,743	30,479	15,079
Total revenues	101,453	89,540	66,712
Cost of Design-to-silicon-yield solutions:	'	'	'
Direct costs of Design-to-silicon-yield solutions	39,470	36,236	29,416
Amortization of acquired technology	'	261	626
Total cost of Design-to-silicon-yield solutions	39,470	36,497	30,042
Gross profit	61,983	53,043	36,670
Operating expenses:	'	'	'
Research and development	13,314	13,251	13,972
Selling, general and administrative	17,025	18,599	18,358
Amortization of other acquired intangible assets	74	174	204
Restructuring charges (credits)	197	1,889	-110
Total operating expenses	30,610	33,913	32,424
Income from operations	31,373	19,130	4,246
Interest and other income (expense), net	-64	-248	73
Income before taxes	31,309	18,882	4,319
Income tax provision (benefit)	10,380	-18,329	2,439
Net income	20,929	37,211	1,880
Other comprehensive income:	'	'	'
Foreign currency translation adjustments, net of tax	397	134	-294
Reclassification adjustment for other-than-temporary impairment on auction-rate-securities recognized in earnings, net of tax	'	216	'
Unrealized gain on investments, net of tax	'	'	66
Net income per share	'	'	'
Basic (in Dollars per share)	$0.70	$1.30	$0.07
Diluted (in Dollars per share)	$0.67	$1.25	$0.07
Weighted average common shares	'	'	'
Basic (in Shares)	29,826	28,700	28,086
Diluted (in Shares)	31,393	29,809	28,431
Net income	20,929	37,211	1,880
Other comprehensive income:	'	'	'
Foreign currency translation adjustments, net of tax	397	134	-294
Reclassification adjustment for other-than-temporary impairment on auction-rate-securities recognized in earnings, net of tax	'	216	'
Unrealized gain on investments, net of tax	'	'	66
Comprehensive income	$21,326	$37,561	$1,652

Consolidated_Statements_of_Sto

Consolidated Statements of Stockholders' Equity (USD $)	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
In Thousands, except Share data
Balances at Dec. 31, 2010	$4	$200,866	($19,298)	($130,669)	($71)	$50,832
Balances (in Shares) at Dec. 31, 2010	27,603,000	'	3,673,000	'	'	'
Issuance of common stock in connection with employee stock purchase plan	'	865	'	'	'	865
Issuance of common stock in connection with employee stock purchase plan (in Shares)	414,000	'	'	'	'	414,000
Issuance of common stock in connection with exercise of options	'	2,304	'	'	'	2,304
Issuance of common stock in connection with exercise of options (in Shares)	531,000	'	'	'	'	531,000
Vesting of restricted stock units (in Shares)	414,000	'	'	'	'	'
Purchases of treasury stock in connection with tax withholdings on restricted stock grants	'	'	-652	'	'	-652
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (in Shares)	-114,000	'	114,000	'	'	'
Purchases of treasury stock	'	'	-2,949	'	'	-2,949
Purchases of treasury stock (in Shares)	-544,000	'	544,000	'	'	'
Stock-based compensation expense	'	4,791	'	'	'	4,791
Comprehensive income	'	'	'	1,880	-228	1,652
Balances at Dec. 31, 2011	4	208,826	-22,899	-128,789	-299	56,843
Balances (in Shares) at Dec. 31, 2011	28,304,000	'	4,331,000	'	'	'
Issuance of common stock in connection with employee stock purchase plan	'	978	'	'	'	978
Issuance of common stock in connection with employee stock purchase plan (in Shares)	201,000	'	'	'	'	'
Issuance of common stock in connection with exercise of options	'	5,528	'	'	'	5,528
Issuance of common stock in connection with exercise of options (in Shares)	1,019,000	'	'	'	'	1,019,000
Vesting of restricted stock units (in Shares)	172,000	'	'	'	'	'
Purchases of treasury stock in connection with tax withholdings on restricted stock grants	'	'	-511	'	'	-511
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (in Shares)	-45,000	'	45,000	'	'	'
Purchases of treasury stock	'	'	-4,368	'	'	-4,368
Purchases of treasury stock (in Shares)	-425,000	'	425,000	'	'	'
Stock-based compensation expense	'	4,880	'	'	'	4,880
Tax benefit from employee stock plans	'	149	'	'	'	149
Comprehensive income	'	'	'	37,211	350	37,561
Balances at Dec. 31, 2012	4	220,361	-27,778	-91,578	51	101,060
Balances (in Shares) at Dec. 31, 2012	29,226,000	'	4,801,000	'	'	'
Issuance of common stock in connection with employee stock purchase plan	'	1,317	'	'	'	1,317
Issuance of common stock in connection with employee stock purchase plan (in Shares)	184,000	'	'	'	'	'
Issuance of common stock in connection with exercise of options	1	5,338	'	'	'	5,339
Issuance of common stock in connection with exercise of options (in Shares)	871,000	'	'	'	'	871,000
Vesting of restricted stock units (in Shares)	217,000	'	'	'	'	'
Purchases of treasury stock in connection with tax withholdings on restricted stock grants	'	'	-1,283	'	'	-1,283
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (in Shares)	-61,000	'	61,000	'	'	'
Issuance of treasury stock	'	-156	156	'	'	'
Issuance of treasury stock (in Shares)	'	'	-14,000	'	'	'
Stock-based compensation expense	'	6,591	'	'	'	6,591
Tax benefit from employee stock plans	'	362	'	'	'	362
Comprehensive income	'	'	'	20,929	397	21,326
Balances at Dec. 31, 2013	$5	$233,813	($28,905)	($70,649)	$448	$134,712
Balances (in Shares) at Dec. 31, 2013	30,437,000	'	4,848,000	'	'	'

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating activities:	'	'	'
Net income	$20,929	$37,211	$1,880
Depreciation and amortization	1,385	515	459
Stock-based compensation expense	6,693	4,891	4,791
Amortization of acquired intangible assets	74	434	830
Deferred taxes	5,539	-20,060	21
Purchases of treasury stock in connection with tax withholdings on restricted stock grants	-1,283	-511	-652
Provision for doubtful accounts	3	97	'
Loss on disposal of assets	-7	45	'
Gain on sale of investments	'	-50	'
Net impairment of investments	'	75	'
Tax benefit related to stock-based compensation expense	362	149	'
Excess tax benefit from stock-based compensation expense	-353	-114	'
Changes in operating assets and liabilities:	'	'	'
Accounts receivable, net of allowances	-636	-12,150	1,268
Prepaid expenses and other assets	-1,053	-1,250	-210
Accounts payable	-566	722	-367
Accrued compensation and related benefits	-3,216	5,669	1,074
Accrued and other liabilities	-913	13	-1,136
Deferred revenues	-1,131	352	-32
Billings in excess of recognized revenues	-464	-1,282	287
Net cash provided by operating activities	25,363	14,756	8,213
Investing activities:	'	'	'
Proceeds from the sale of investments	'	975	'
Purchases of property and equipment	-4,628	-2,334	-405
Net cash used in investing activities	-4,628	-1,359	-405
Financing activities:	'	'	'
Exercise of stock options	5,339	5,527	2,304
Proceeds from employee stock purchase plan	1,317	977	865
Purchases of treasury stock	'	-4,368	-2,949
Excess tax benefit from stock-based compensation expense	353	114	'
Principal payments on long-term obligations	'	'	-112
Net cash provided by financing activities	7,009	2,250	108
Effect of exchange rate changes on cash and cash equivalents	-10	-51	-29
Net increase in cash and cash equivalents	27,734	15,596	7,887
Cash and cash equivalents, beginning of year	61,637	46,041	38,154
Cash and cash equivalents, end of year	89,371	61,637	46,041
Supplemental disclosure of cash flow information:	'	'	'
Taxes	4,747	1,665	2,065
Interest	'	'	7
Property and equipment received and accrued in accounts payable and accrued and other liabilities	$312	$486	$34

Note_1_Basis_of_Presentation

Note 1 - Basis of Presentation	12 Months Ended
	Dec. 31, 2013
Disclosure Text Block [Abstract]	'
Business Description and Accounting Policies [Text Block]	'
	1.  Business and Significant Accounting Policies
	PDF Solutions, Inc. (the “Company” or “PDF”), provides infrastructure technologies and services to improve yield and optimize performance of integrated circuits. The Company’s approach includes manufacturing simulation and analysis, combined with yield improvement methodologies to increase product yield and performance.
	Basis of Presentation  — The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries after the elimination of all significant intercompany balances and transactions.
	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 revenue recognition for fixed-price solution implementation service contracts, stock-based compensation expense and accounting for income taxes. Actual results could differ from those estimates.
	Concentration of Credit Risk  — Financial instruments that potentially expose the Company to concentrations of credit risk consist primarily of cash and cash equivalents and accounts receivable. The Company maintains its cash and cash equivalents with what it considers high credit quality financial institutions.
	The Company primarily sells its technologies and services to companies in Asia, Europe and North America within the semiconductor industry. As of December 31, 2013, three customers accounted for 76% of the Company’s gross accounts receivable and three customers accounted for 74% of the Company’s revenues for 2013. As of December 31, 2012, three customers accounted for 71% of the Company’s gross accounts receivable and three customers accounted for 73% of the Company’s revenues for 2012. See Note 11 for further details. The Company does not require collateral or other security to support accounts receivable. To reduce credit risk, management performs ongoing credit evaluations of its customers’ financial condition. The Company maintains allowances for potential credit losses.  The allowance for doubtful accounts, which was based on management’s best estimates, could be adjusted in the near term from current estimates depending on actual experience. Such adjustments could be material to the consolidated financial statements.
	Cash, Cash Equivalents and Short-term Investments — The Company considers all highly liquid investments with an original maturity of 90 days or less or investments with a remaining maturity of 90 days or less at the time of purchase to be cash equivalents. Investments with maturities greater than three months and less than one year are classified as short-term investments.
	Property and Equipment  — Property and equipment are stated at cost and are depreciated using the straight-line method over the estimated useful lives of the related asset as follows:
	Computer equipment (years)	3
	Software (years)	3
	Furniture, fixtures, and equipment (years)	5	-	7
	Leasehold improvements	Shorter of estimated useful life or term of lease
	Long-lived Assets  — The Company’s long-lived assets, excluding goodwill, consist of property and equipment and other acquired intangibles. The Company periodically reviews its long-lived assets for impairment. For assets to be held and used, the Company initiates its review whenever events or changes in circumstances indicate that the carrying amount of a long-lived asset group may not be recoverable. Recoverability of an asset group is measured by comparison of its carrying amount to the expected future undiscounted cash flows that the asset group is expected to generate. If it is determined that an asset group is not recoverable, an impairment loss is recorded in the amount by which the carrying amount of the asset group exceeds its fair value.
	As discussed in Note 11, the Company considers itself to be in one operating segment. In addition, the Company has determined that its operating segment is also its reporting unit as the operating segment comprises only a single component. To determine the reporting unit’s fair value, the Company used the income valuation approach. In determining its overall conclusion of reporting unit’s fair value, the Company also considers the estimated value derived from the market valuation approach as compared to the valuation under the income approach as one measure that the estimated fair value is reasonable.
	The income approach provides an estimate of fair value based on discounted expected future cash flows. Estimates and assumptions with respect to the determination of the fair value of the Company’s reporting unit using the income approach include the Company’s operating forecasts, revenue growth rates, and risk-commensurate discount rates and costs of capital. The Company’s estimates of revenues and costs are based on historical data, various internal estimates and a variety of external sources, and are developed as part of the Company’s routine long-range planning process.
	The market approach provides an estimate of the fair value of the Company’s reporting unit using various prices or market multiples applied to the reporting unit’s operating results and then applying an appropriate control premium, which is determined by considering control premiums offered as part of acquisitions in both the Company’s market segment and comparable market segments.
	Revenue Recognition  — The Company derives revenue from two sources: Design-to-silicon-yield solutions and Gainshare performance incentives.
	Design-to-silicon-yield solutions — Revenues that are derived from Design-to-silicon-yield solutions come from services and software licenses. The Company recognizes revenue for each element 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.
	Accounts Receivable  — Accounts receivable includes amounts that are unbilled at the end of the period. Unbilled accounts receivable are determined on an individual contract basis and were approximately $8.0 million and $7.7 million at December 31, 2013 and 2012, respectively. The Company performs ongoing credit evaluations of its customers’ financial condition. An allowance for doubtful accounts is maintained for probable credit losses based upon the Company’s assessment of the expected collectability of the accounts receivable. The allowance for doubtful accounts is reviewed on a quarterly basis to assess the adequacy of the allowance.
	Allowance for doubtful accounts are summarized below:
		Balance at			Charged		Deductions/		Balance
		Beginning			to Costs		Write-offs		at End
		of Period			and Expenses		of Accounts		of Period
	Allowance for doubtful accounts
	2013	$	351		$	3	$	—	$	354
	2012	$	254		$	97	$	—	$	351
	2011	$	254		$	—	$	—	$	254
	Software Development Costs  — Costs for the development of new software products and substantial enhancements to existing software products are expensed as incurred until technological feasibility has been established, at which time any additional costs would be capitalized. Because the Company believes its current process for developing software is essentially completed concurrently with the establishment of technological feasibility, no costs have been capitalized to date.
	Research and Development  — Research and development expenses are charged to operations as incurred.
	Stock-Based Compensation  — 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. As stock-based compensation expense recognized is based on awards ultimately expected to vest, it has been reduced for estimated forfeitures. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. The Company has elected to use the Black-Scholes-Merton option-pricing model, which incorporates various assumptions including volatility, expected life and interest rates. The expected volatility is based on the historical volatility of the Company’s common stock over the most recent period commensurate with the estimated expected life of the Company’s stock options. The expected life of an award is based on historical experience and on the terms and conditions of the stock awards granted to employees. The interest rate assumption is based upon observed Treasury yield curve rates appropriate for the expected life of the Company’s stock options.
	Income Taxes – The Company's provision for income tax comprises its current tax liability and change in deferred tax assets and liabilities. Deferred tax assets and liabilities are recognized for the expected tax consequences of temporary differences between the tax bases of assets and liabilities. The measurement of current and deferred tax assets and liabilities is based on provisions of enacted tax laws; the effect of future changes in tax laws or rates are not anticipated. Valuation allowances are provided to reduce deferred tax assets to an amount that in management’s judgment is more likely than not to be recoverable against future taxable income. No U.S. taxes are provided on earnings of non-U.S. subsidiaries, to the extent such earnings are deemed to be permanently invested. The Company's income tax calculations are based on application of the respective U.S. federal, state or foreign tax laws. The Company’s tax filings, however, are subject to audit by the respective tax authorities.  Accordingly, the Company recognizes tax liabilities based upon its estimate of whether, and the extent to which, additional taxes will be due when such estimates are more-likely-than-not to be sustained. An uncertain income tax position will not be recognized if it has less than a 50% likelihood of being sustained. To the extent the final tax liabilities are different than the amounts originally accrued, the increases or decreases are recorded as income tax expense or benefit in the consolidated statements of operations.
	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. Dilutive potential common shares consist of incremental common shares issuable upon exercise of stock options, upon vesting of restricted stock units, contingently issuable shares for all periods and assumed issuance of shares under employee stock purchase plan. No dilutive potential common shares are included in the computation of any diluted per share amount when a loss from continuing operations was reported by the Company.
	Foreign Currency Translation  — The functional currency of the Company’s foreign subsidiaries is the local currency for the respective subsidiary. The assets and liabilities are translated at the period-end exchange rate, and statements of operations are translated at the average exchange rate during the year. Gains and losses resulting from foreign currency translations are included as a component of other comprehensive income (loss). Gains and losses resulting from foreign currency transactions are included in the consolidated statement of operations.
	Derivative Financial Instruments — The Company operates internationally and is exposed to potentially adverse movements in foreign currency exchange rates. The Company enters into foreign currency forwards contracts to reduce the exposure to foreign currency exchange rate fluctuations on certain foreign currency denominated monetary assets and liabilities. The Company does not use foreign currency contracts for speculative or trading purposes. The Company records these forward contracts at fair value. The counterparty to these foreign currency forward contracts is a large global financial institution that the Company believes is creditworthy, and therefore, we believe the credit risk of counterparty non-performance is not significant. These foreign currency forward contracts are not designated for hedge accounting treatment. Therefore, the change in fair value of these derivatives is recorded into earnings as a component of other income (expense), net and offsets the change in fair value of the foreign currency denominated monetary assets and liabilities, which are also recorded in other income (expense), net. The duration of these forward contracts is usually between two to three months.
	Litigation  — The Company is involved in certain legal proceedings. The Company records the estimated liability in its consolidated financial statements if the Company believes that a loss arising from such matters is probable and can be reasonably estimated. If only a range of estimated losses can be determined, the Company records an amount within the range that, in its judgment, reflects the most likely outcome; if none of the estimates within that range is a better estimate than any other amount, the Company records the low end of the range. Any such accrual would be charged to expense in the appropriate period. The Company recognizes litigation expenses in the period in which the litigation services were provided.
	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 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 to be 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.

Note_2_Property_and_Equipment

Note 2 - Property and Equipment	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Abstract]	'
Property, Plant and Equipment Disclosure [Text Block]	'
	2.  Property and Equipment
	Property and equipment consist of (in thousands):
		December 31,
		2013			2012
	Computer equipment	$	9,969		$	10,319
	Software		3,441			3,552
	Furniture, fixtures, and equipment		734			971
	Leasehold improvements		1,052			1,021
	Test equipment		4,928			2,005
	Construction-in-progress		1,421			864
			21,545			18,732
	Accumulated depreciation and amortization		(14,481	)		(14,834	)
		$	7,064		$	3,898
	Depreciation and amortization expense for years ended December 31, 2013, 2012 and 2011 was $1.4 million, $0.5 million and $0.5 million, respectively.

Note_3_Intangible_Assets

Note 3 - Intangible Assets	12 Months Ended
	Dec. 31, 2013
Disclosure Text Block [Abstract]	'
Intangible Assets Disclosure [Text Block]	'
	3.   Intangible Assets
	The following tables provide information relating to the intangible assets contained within the Company’s consolidated balance sheet as of December 31, 2013 and 2012 (in thousands):
					31-Dec-13
		Amortization			Gross		Accumulated			Net
		Period			Carrying		Amortization			Carrying
		(Years)			Amount					Amount
	Acquired identifiable intangibles:
	Acquired technology	4	-	5	$	11,800	$	(11,800	)	$	—
	Brand name		4			510		(510	)		—
	Customer relationships and backlog	1	-	6		3,420		(3,420	)		—
	Patents and applications		7			1,400		(1,369	)		31
	Other acquired intangibles		4			255		(255	)		—
	Total				$	17,385	$	(17,354	)	$	31
					31-Dec-12
		Amortization			Gross		Accumulated			Net
		Period			Carrying		Amortization			Carrying
		(Years)			Amount					Amount
	Acquired identifiable intangibles:
	Acquired technology	4	-	5	$	11,800	$	(11,800	)	$	—
	Brand name		4			510		(510	)		—
	Customer relationships and backlog	1	-	6		3,420		(3,420	)		—
	Patents and applications		7			1,400		(1,296	)		104
	Other acquired intangibles		4			255		(255	)		—
	Total				$	17,385	$	(17,281	)	$	104
	Intangible asset amortization expense for the years ended December 31, 2013, 2012 and 2011 was $0.1 million, $0.4 million and $0.8 million, respectively. The Company expects the annual amortization of its existing intangible assets to be $31,000 in 2014.
	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 years ended December 31, 2013, 2012 and 2011, there were no indicators of impairment related to the Company’s intangible assets.

Note_4_Accrued_and_Other_Curre

Note 4 - Accrued and Other Current Liabilities	12 Months Ended
	Dec. 31, 2013
Other Liabilities and Financial Instruments Subject to Mandatory Redemption [Abstract]	'
Other Liabilities Disclosure [Text Block]	'
	4.  Accrued and Other Current Liabilities
	Accrued and other current liabilities consist of (in thousands):
		December 31,
		2013		2012
	Current portion of accrued restructuring	$	13	$	1,344
	Other current liabilities		1,580		1,538
	Total accrued and other current liabilities	$	1,593	$	2,882

Note_5_Other_NonCurrent_Liabil

Note 5 - Other Non-Current Liabilities	12 Months Ended
	Dec. 31, 2013
Disclosure Text Block Supplement [Abstract]	'
Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Noncurrent [Text Block]	'
	5.  Other Non-Current Liabilities
	Other non-current liabilities consist of (in thousands):
		December 31,
		2013		2012
	Non-current portion of deferred rent	$	384	$	41
	Non-current portion of deferred revenues		244		239
	Total other non-current liabilities	$	628	$	280

Note_6_Commitments_and_Conting

Note 6 - Commitments and Contingencies	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies Disclosure [Text Block]	'
	6.  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 $2.0 million, $2.2 million and $2.4 million in 2013, 2012 and 2011, respectively.
	Future minimum lease payments under noncancelable operating leases at December 31, 2013 are as follows (in thousands):
	Year Ending December 31,
	2014	$	1,713
	2015		1,628
	2016		1,632
	2017		1,350
	2018		735
	Total future minimum lease payments	$	7,058
	Indemnifications  — The Company generally provides a warranty to its customers that its software will perform substantially in accordance with documented specifications typically for a period of 90 days following delivery of its products. The Company also indemnifies certain customers from third-party claims of intellectual property infringement relating to the use of its products. Historically, costs related to these guarantees have not been significant. The Company is unable to estimate the maximum potential impact of these guarantees on its future results of operations.
	Purchase obligations — The Company has purchase obligations with certain suppliers for the purchase of goods and services entered in the ordinary course of business. As of December 31, 2013, total outstanding purchase obligations were $1.8 million which are primarily due within the next 12 months.
	Indemnification of Officers and Directors  — As permitted by the Delaware general corporation law, the Company has included a provision in its certificate of incorporation to eliminate the personal liability of its officers and directors for monetary damages for breach or alleged breach of their fiduciary duties as officers or directors, other than in cases of fraud or other willful misconduct.
	In addition, the Bylaws of the Company provide that the Company is required to indemnify its officers and directors even when indemnification would otherwise be discretionary, and the Company is required to advance expenses to its officers and directors as incurred in connection with proceedings against them for which they may be indemnified. The Company has entered into indemnification agreements with its officers and directors containing provisions that are in some respects broader than the specific indemnification provisions contained in the Delaware general corporation law. The indemnification agreements require the Company to indemnify its officers and directors against liabilities that may arise by reason of their status or service as officers and directors other than for liabilities arising from willful misconduct of a culpable nature, to advance their expenses incurred as a result of any proceeding against them as to which they could be indemnified, and to obtain directors’ and officers’ insurance if available on reasonable terms. The Company has obtained directors’ and officers’ liability insurance in amounts comparable to other companies of the Company’s size and in the Company’s industry. Since a maximum obligation of the Company is not explicitly stated in the Company’s Bylaws or in its indemnification agreements and will depend on the facts and circumstances that arise out of any future claims, the overall maximum amount of the obligations cannot be reasonably estimated.
	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. With respect to the matter below, the Company determined a potential loss was not probable at December 31, 2013 and, accordingly, no amount was accrued at such time.
	Philip Steven Melman filed a complaint against the Company and the Company's Chief Executive Officer on December 7, 2009 in the Superior Court for Santa Clara County, California. In the complaint, Mr. Melman alleged wrongful discharge based on discrimination, fraud, breach of contract and similar theories, in connection with the termination of Mr. Melman's employment with the Company. The complaint sought compensatory and punitive damages, any other available remedies, as well as attorney's fees and costs. Summary judgment in the favor of both the Company and Dr. Kibarian was entered by the court on October 27, 2011 and November 15, 2011, respectively. Mr. Melman appealed both orders in the Sixth District Court of Appeal in Santa Clara County, California. On March 22, 2013, the Court released its opinion affirming in full the grant of summary judgment in favor of the Company and Dr. Kibarian, which decision became final on April 22, 2013.

Note_7_Stockholders_Equity

Note 7 - Stockholders' Equity	12 Months Ended
	Dec. 31, 2013
Disclosure Text Block Supplement [Abstract]	'
Shareholders' Equity and Share-based Payments [Text Block]	'
	7.  Stockholders’ Equity
	Stock-based compensation expenses related to the Company’s employee stock purchase plan and stock plans were allocated as follows (in thousands):
		Years Ended December 31,
		2013			2012			2011
	Cost of Design-to-silicon-yield solutions	$	2,736		$	1,786		$	1,923
	Research and development		1,583			1,083			1,197
	Selling, general and administrative		2,374			2,022			1,671
	Stock-based compensation expense	$	6,693		$	4,891		$	4,791
	The stock-based compensation expense for the year ended December 31, 2013 and 2012 in the table above includes expense related to cash-settled stock appreciation rights (“SARs”) granted to certain employees in 2012 which totaled $102,000 and $11,000, respectively. The Company accounted for these awards as a liability and the amount was included in accrued compensation and related benefits.
	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.  As stock-based compensation expense recognized is based on awards ultimately expected to vest, it has been reduced for estimated forfeitures. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates.
	The Company has elected to use the Black-Scholes-Merton option-pricing model, which incorporates various assumptions including volatility, expected life and interest rates. The expected volatility is based on the historical volatility of the Company’s common stock over the most recent period commensurate with the estimated expected life of the Company’s stock options. The expected life of an award is based on historical experience and on the terms and conditions of the stock awards granted to employees. The interest rate assumption is based upon observed Treasury yield curve rates appropriate for the expected life of the Company’s stock options.
	The fair value of equity awards granted was estimated on the date of grant with the following weighted average assumptions:
		Stock Plans									Employee Stock
											Purchase Plan
		2013			2012			2011			2013			2012			2011
	Expected life (in years)		4.8			4.8			4.9			1.25			1.25			1.25
	Volatility		54.1	%		59.2	%		61.1	%		45.3	%		51.6	%		57.7	%
	Risk-free interest rate		1.03	%		0.77	%		1.52	%		0.19	%		0.18	%		0.46	%
	Expected dividend		—			—			—			—			—			—
	On December 31, 2013, the Company had 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 , which was amended and restated at the 2013 annual meeting of stockholders on May 28, 2013, when the Company’s stockholders approved the First Amended and Restated 2011 Stock Incentive Plan (as amended, 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 4,800,000 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.
	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 December 31, 2013, 5.2 million shares of common stock were reserved to cover stock-based awards under the 2011 Plan, of which 2.8 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 December 31, 2013. As of December 31, 2013, there were no outstanding awards that had been granted outside of the 2011, 2001 or the IDS Plans (collectively, the "Stock Plans").
	Additional information with respect to options under the Plans is as follows:
		Outstanding Options
		Number of			Weighted			Weighted			Aggregate
		Options			Average			Average			Intrinsic Value
		(in thousands)			Exercise Price			Remaining			(in thousands)
					per Share			Contractual
								Term (years)
	Outstanding, January 1, 2011		3,453			5.6
	Granted (weighted average fair value of $3.15 per share)		1,165			6.09
	Exercised		(531	)		4.33
	Canceled		(162	)		4.59
	Expired		(53	)		9.02
	Outstanding, December 31, 2011		3,872			5.91
	Granted (weighted average fair value of $4.38 per share)		1,216			8.8
	Exercised		(1,019	)		5.42
	Canceled		(216	)		6.34
	Expired		(43	)		9.78
	Outstanding, December 31, 2012		3,810			6.91
	Granted (weighted average fair value of $7.75 per share)		77			17.12
	Exercised		(871	)		6.13
	Canceled		(114	)		8.76
	Expired		(22	)		5.98
	Outstanding, December 31, 2013		2,880			7.35			6.57		$	52,613
	Vested and expected to vest, December 31, 2013		2,805			7.31			6.52		$	51,352
	Exercisable, December 31, 2013		1,838			6.79			5.7		$	34,615
	The aggregate intrinsic value in the table above represents the total intrinsic value based on the Company’s closing stock price of $25.62 as of December 31, 2013, which would have been received by the option holders had all option holders exercised their options as of that date. The total intrinsic value of options exercised during the year ended December 31, 2013, 2012 and 2011 was $11.9 million, $5.8 million and $0.6 million.
	As of December 31, 2013, there was $4.1 million of total unrecognized compensation cost net of forfeitures related to unvested stock options. That cost is expected to be recognized over a weighted average period of 2.07 years. The total fair value of options vested during the year ended December 31, 2013 was $2.9 million. As of December 31, 2012, there was $6.0 million of total unrecognized compensation cost net of forfeitures related to unvested stock options. That cost is expected to be recognized over a weighted average period of 2.76 years. The total fair value of options vested during the year ended December 31, 2012 was $2.7 million.
	Nonvested shares (restricted stock units) were as follows:
		Shares			Weighted-
		(in			Average
		thousands)			Grant-Date
					Fair Value
	Nonvested, January 1, 2011		453			7.29
	Granted		292			6.18
	Vested		(414	)		6.12
	Forfeited		(28	)		6.89
	Nonvested, December 31, 2011		303			7.82
	Granted		359			8.97
	Vested		(172	)		9.87
	Forfeited		(40	)		7.66
Nonvested, December 31, 2012		450			7.97
Granted		562			18.25
Vested		(217	)		11.01
Forfeited		(36	)		11.08
Nonvested, December 31, 2013
		759			14.44
As of December 31, 2013, there was $9.4 million of total unrecognized compensation cost related to restricted stock rights. That cost is expected to be recognized over a weighted average period of 2.81 years. Restricted stock units do not have rights to dividends prior to vesting.
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. As of December 31, 2013, 4.5 million shares of the Company’s common stock have been reserved for issuance under the Purchase Plan. During 2013, 2012 and 2011, the number of shares issued were 184,000, 201,000 and 414,000, respectively, at a weighted average price of $7.16, $4.86 and $2.09 per share, respectively. As of December 31, 2013, 1.3 million shares were available for future issuance under the Purchase Plan. The weighted average estimated fair value of shares granted under the Purchase Plan during 2013, 2012 and 2011 was $5.56, $3.00 and $1.64 per share, respectively. For the year ended December 31, 2013, 2012 and 2011, the Purchase Plan compensation expense was $0.6 million, $0.4 million and $0.4 million, respectively. As of December 31, 2013, there was $0.6 million of unrecognized compensation cost related to the Purchase Plan. That cost is expected to be recognized over a weighted average period of 1.2 years.
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 December 31, 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_8_Restructuring

Note 8 - Restructuring	12 Months Ended
	Dec. 31, 2013
Restructuring and Related Activities [Abstract]	'
Restructuring and Related Activities Disclosure [Text Block]	'
	8. Restructuring
	The Company implemented restructuring plans during fiscal years 2012 and 2008, and recorded total restructuring charges (credits) of $0.2 million, $1.8 million and $(0.1) million for the year ended on December 31, 2013, 2012 and 2011, respectively. As of December 31, 2013, the remaining restructuring accrual was immaterial and the Company expects to substantially pay out such balance by the end of the first quarter of 2014. 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 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 $2.1 million, which primarily consisted of employee severance costs of $2.0 million. The following table summarizes the activities of these restructuring liabilities (in thousands):
		Severance			Professional			Total
					and Other
					Fees
	Balances, January 1, 2012	$	—		$	—		$	—
	Restructuring charges		1,733			73			1,806
	Payments		(848	)		(62	)		(910	)
	Balances, December 31, 2012	$	885		$	11		$	896
	Restructuring charges		249			51			300
	Payments		(1,121	)		(62	)		(1,183	)
	Balances, December 31, 2013	$	13		$	—		$	13
	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):
		Severance			Facility			Professional			Total
					Exit			and Other
								Fees
	Balances, January 1, 2011	$	110		$	1,264		$	5		$	1,379
	Restructuring credits		—			(105	)		(5	)		(110	)
	Adjustments		—			32			—			32
	Payments		(7	)		(566	)		—			(573	)
	Balances, December 31, 2011	$	103		$	625		$	—		$	728
	Restructuring charges		—			83			—			83
	Adjustments		—			173			—			173
	Payments		—			(536	)		—			(536	)
	Balances, December 31, 2012	$	103		$	345		$	—		$	448
	Restructuring credits		(103	)		—			—			(103	)
	Adjustments		—			4			—			4
	Payments		—			(349	)		—			(349	)
	Balances, December 31, 2013	$	—		$	—		$	—		$	—

Note_9_Income_Taxes

Note 9 - Income Taxes	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Income Tax Disclosure [Text Block]	'
	9.  Income Taxes
		Year Ended December 31,
		2013			2012			2011
		(In thousands)
	U.S.
	Current	$	719		$	271		$	(237	)
	Deferred		5,432			(19,863	)		—
	Foreign
	Current		291			512			207
	Withholding		3,830			948			2,448
	Deferred		108			(197	)		21
	Total provision (benefit)	$	10,380		$	(18,329	)	$	2,439
	During the years ended December 31, 2013, 2012 and 2011, income before taxes from U.S. operations was $29.6 million, $17.7 million and $2.9 million, respectively, and income before taxes from foreign operations was $1.7 million, $1.2 million and $1.4 million, respectively.
	The income tax provision (benefit) differs from the amount estimated by applying the statutory federal income tax rate (35%) for the following reasons (in thousands):
		Year Ended December 31,
		2013			2012			2011
	Federal statutory tax provision	$	10,958		$	6,609		$	1,511
	State tax provision (benefit)		581			(925	)		19
	Stock compensation expense		393			644			186
	Tax credits		(5,424	)		(722	)		(3,297	)
	Foreign tax, net		3,884			906			2,171
	Change in valuation allowance		—			(25,223	)		1,794
	Other		(12	)		382			55
	Tax provision (benefit)	$	10,380		$	(18,329	)	$	2,439
	As of December 31, 2013, the Company had California net operating loss carry-forwards (“NOLs”) of approximately $7.4 million. The California NOLs begin expiring after 2031.
	The Company’s 2012 tax provision did not include the benefit of the 2012 federal R&D credit. On January 2, 2013, the President of the United States signed into law The American Taxpayer Relief Act of 2012. Under prior U.S. law, a taxpayer was entitled to a research tax credit for qualifying amounts paid or incurred on or before December 31, 2011. The 2012 Taxpayer Relief Act extended the research tax credit for two years to December 31, 2013. The extension of the research tax credit was retroactive to January 1, 2012 and included amounts paid or incurred after December 31, 2011. As of December 31, 2013, the Company had federal and state research and experimental and other tax credit (“R&D credits”) carry-forwards of approximately $10.6 million and $11.6 million, respectively. The federal credits begin to expire after 2022, while the California credits have no expiration. The extent to which the federal and state credit carry forwards can be used to offset future tax liabilities, respectively, may be limited, depending on the extent of ownership changes within any three-year period as provided in the Tax Reform Act of 1986 and the California Conformity Act of 1987.
	The Company assesses its deferred tax assets for recoverability on a regular basis, and where applicable, a valuation allowance is recorded to reduce the total deferred tax asset to an amount that will, more likely than not, be realized in the future. In fiscal year 2008, management concluded that it was more likely than not that the Company’s net deferred tax assets would not be fully realizable. As a result of management’s evaluation, the Company recorded valuation allowances against substantially all of its net deferred tax assets at that time. The Company evaluates positive and negative evidence at each financial reporting period to determine whether it is more likely than not that the Company’s deferred tax assets would be realizable.  In accordance with such process, at December 31, 2012, the Company again evaluated the available objective evidence, both positive and negative, and concluded that it was more likely than not at that time that a portion of its deferred tax assets would be realizable, and accordingly, the Company determined that valuation allowances aggregating to $19.9 million were no longer needed. This amount released from the valuation allowance has been reported as a component of income tax benefit in the accompanying Consolidated Statement of Operations for the year ended December 31, 2012. The remaining balance of the valuation allowance primarily relates to California R&D tax credits that have not met the “more-likely-than-not” realization threshold criteria. Under current tax law, the Company on an annual basis generates more California credits than California tax. As a result, at December 31, 2013 and 2012, the excess credits of $5.1 million and $4.7 million, respectively continued to be subject to a full valuation allowance. The Company will continue to review its deferred tax assets in accordance with the applicable accounting standards. Net deferred tax assets balance as of December 31, 2013 and 2012 was $14.5 million and $20.1 million respectively. The balance as of December 31, 2013 consists of $5.9 million net deferred tax assets-current portion and $8.6 million net deferred tax assets-long-term portion. The balance as of December 31, 2012 consists of $3.6 million net deferred tax assets-current portion and $16.5 million net deferred tax assets-long-term portion.
	Tax attributes related to stock option windfall deductions are not recorded until they result in a reduction of cash tax payable. Federal tax credits and state net operating losses from windfall deductions were excluded from the deferred tax asset balance as of December 31, 2013. As of December 31, 2013, the benefit of the federal credits and state net operating loss deferred tax assets of $4.9 million and $78,000, respectively, will be recorded to additional paid-in capital when they reduce cash taxes payable. As of December 31, 2012, the excluded windfall deductions for federal and state purposes were $1.7 million and $23,000, respectively.
	The components of the net deferred tax assets are comprised of (in thousands):
		December 31,
		2013			2012
	Net operating loss carry forward	$	621		$	704
	Research and development and other credit carry forward		6,938			10,839
	Foreign tax credit carry forward		—			135
	Accruals deductible in different periods		3,453			3,897
	Intangible assets		6,105			6,996
	Stock-based compensation		2,491			2,198
	Valuation allowance		(5,087	)		(4,708	)
	Total	$	14,521		$	20,061
	In accordance with the provisions of the accounting standard relating to accounting for uncertain tax positions, the Company classifies its liabilities for income tax exposures as long-term. The Company includes interest and penalties related to unrecognized tax benefits within the Company’s income tax provision. As of December 31, 2013 and 2012, the Company had accrued interest and penalties related to unrecognized tax benefits of $466,000 and $426,000, respectively.  In the years ended December 31, 2013, 2012 and 2011, the Company recognized charges (credits) for interest and penalties related to unrecognized tax benefits in the consolidated statements of operations of $39,000, $(16,000) and $(19,000), respectively.
	The Company’s total amount of unrecognized tax benefits, excluding interest and penalties, as of December 31, 2013 was $10.2 million, of which $6.3 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 December 31, 2013, the Company has recorded unrecognized tax benefits of $3.0 million, including interest and penalties, as long-term income taxes payable in its consolidated balance sheet. The remaining $7.7 million has been recorded net of our deferred tax assets, of which $3.9 million is subject to a full valuation allowance. The Company does not expect the change in unrecognized tax benefits over the next twelve months to materially impact its results of operations and financial position.
	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’s France income tax examinations for 2009 were closed during the fiscal year of 2012 with immaterial adjustments.  The Company is not subject to income tax examinations in any other of its major foreign subsidiaries’ jurisdictions.
	A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):
		Amount
	Gross unrecognized tax benefits, January 1, 2011	$	9,407
	Increases in tax positions for current year		777
	Increase in tax positions for prior years		38
	Lapse in statute of limitations		(578	)
	Gross unrecognized tax benefits, December 31, 2011		9,644
	Increases in tax positions for current year		616
	Increases in tax positions for prior years	—
	Lapse in statute of limitations		(707	)
	Gross unrecognized tax benefits, December 31, 2012		9,553
	Increases in tax positions for current year		1,052
	Increases in tax positions for prior years	—
	Lapse in statute of limitations		(389	)
	Gross unrecognized tax benefits, December 31, 2013	$	10,216
	Undistributed earnings of the Company’s foreign subsidiaries of $4.0 million are considered to be indefinitely reinvested and accordingly, no provision for federal and state income taxes has been provided thereon. Determination of the amount of unrecognized deferred tax liability related to these earnings is not practicable at this time.
	Valuation allowance for deferred tax assets is summarized:
		Balance at			Charged			Deductions/			Balance
		Beginning			to Costs			Write-offs			at End
		of Period			and Expenses			of Accounts			of Period
	Valuation allowance for deferred tax assets
2013	$	4,708		$	379		$	—		$	5,087
2012		30,731			—			(26,023	)		4,708
2011		30,837			—			(106	)		30,731

Note_10_Net_Income_Loss_Per_Sh

Note 10 - Net Income (Loss) Per Share	12 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Earnings Per Share [Text Block]	'
	10.  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):
		Year Ended December 31,
		2013		2012		2011
	Numerator:
	Net income	$	20,929	$	37,211	$	1,880
	Numerator:
	Basic weighted-average shares outstanding		29,826		28,700		28,086
	Effect of dilutive options and restricted stock		1,567		1,109		345
	Diluted weighted-average shares outstanding		31,393		29,809		28,431
	Net income per share - Basic	$	0.7	$	1.3	$	0.07
	Net income per share - Diluted	$	0.67	$	1.25	$	0.07
	The following table sets forth potential shares of common stock that are not included in the diluted net loss per share calculation above because to do so would be anti-dilutive for the periods indicated (in thousands):
		December 31,
		2013		2012
	Outstanding options		49		1,275
	Nonvested shares of restricted stock units		4		20
	Employee Stock Purchase Plan		7		—
	Total		60		1,295

Note_11_Customer_and_Geographi

Note 11 - Customer and Geographic Information	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Segment Reporting Disclosure [Text Block]	'
	11.  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 integrated circuit manufacturers.
	The Company had revenues from individual customers in excess of 10% of total revenues as follows:
		Year Ended December 31,
	Customer	2013			2012			2011
	A		33	%		40	%		24	%
	B		24	%		13	%		15	%
	C		17	%		20	%		19	%
	*  represents less than 10%
	The Company had accounts receivable balances from individual customers in excess of 10% of the gross accounts receivable balance as follows:
		December 31,
	Customer	2013			2012
	A		36	%		42	%
	B		23	%		11	%
	C		17	%		18	%
	Revenues from customers by geographic area based on the location of the customers’ work sites are as follows (in thousands):
		Year Ended December 31,
		2013						2012						2011
		Revenues			Percentage of			Revenues			Percentage of			Revenues		Percentage of
					Revenues						Revenues					Revenues
	North America	$	39,058			38	%	$	35,533			40	%	$	21,391		32	%
	Germany		22,431			22			25,928			29			12,039		18
	South Korea		20,953			21			9,160			10			11,407		17
	Japan		8,340			8			8,514			10			8,354		13
	Rest of Asia		6,920			7			6,302			7			7,601		11
	Rest of Europe		3,751			4			4,103			4			5,920		9
	Total revenue	$	101,453			100	%	$	89,540			100	%	$	66,712		100	%
	Long-lived assets, net by geographic area is as follows (in thousands):
		December 31,
		2013			2012
	North America	$	6,578		$	3,527
	Asia		364			295
	Europe		122			76
	Total long-lived assets, net	$	7,064		$	3,898

Note_12_Financial_Instruments

Note 12 - Financial Instruments	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Fair Value Disclosures [Text Block]	'
	12. Financial Instruments
	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 December 31, 2013 and the basis for that measurement (in thousands):
	Assets		Total		Quoted Prices in		Significant Other		Significant
					Active Markets for		Observable Inputs		Unobservable Inputs
					Identical Assets		(Level 2)		(Level 3)
					(Level 1)
	Money market mutual funds		$	26,353	$	26,353	$	—	$	—
	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 in		Significant Other		Significant
					Active Markets for		Observable Inputs		Unobservable Inputs
					Identical Assets		(Level 2)		(Level 3)
					(Level 1)
	Money market mutual funds		$	26,341	$	26,341	$	—	$	—
	The Company enters into foreign currency forward contracts to reduce the exposure to foreign currency exchange rate fluctuations on certain foreign currency denominated monetary assets and liabilities, primarily on third-party accounts payables and intercompany balances. The primary objective of the Company’s hedging program is to reduce volatility of earnings related to foreign currency exchange rate fluctuations. The counterparty to these foreign currency forward contracts is a large global financial institution that the Company believes is creditworthy, and therefore, the Company believes the credit risk of counterparty nonperformance is not significant. These foreign currency forward contracts are not designated for hedge accounting treatment. Therefore, the change in fair value of these contracts is recorded into earnings as a component of other income (expense), net, and offsets the change in fair value of the foreign currency denominated assets and liabilities, which is also recorded in other income (expense), net. For the year ended December 31, 2013, the Company recognized a gain of $0.1 million on the contracts, which is recorded in other income (expense), net in the Company’s Statement of Operations.
	The Company carries these derivatives financial instruments on its Consolidated Balance Sheets at their fair values. The Company’s foreign currency forward contracts are classified as Level 2 because it is not actively traded and the valuation inputs are based on quoted prices and market observable data of similar instruments. As of December 31, 2013 The Company had one outstanding forward contract with a notional amount of $7.6 million. As the Company signed the forward contract on December 31, 2013, the fair value of this foreign currency forward contract is zero, thus as of December 31, 2013, the Company did not record any other current assets or current liabilities associated with this outstanding forward contract.

Note_13_Employee_Benefit_Plan

Note 13 - Employee Benefit Plan	12 Months Ended
	Dec. 31, 2013
Disclosure Text Block Supplement [Abstract]	'
Compensation and Employee Benefit Plans [Text Block]	'
	13. Employee Benefit Plan
	During 1999, the Company established a 401(k) tax-deferred savings plan, whereby eligible employees may contribute up to 15% of their eligible compensation with a maximum amount subject to IRS guidelines in any calendar year. Company contributions to this plan are discretionary; no such Company contributions have been made since the inception of this plan.

Note_14_Selected_Quarterly_Fin

Note 14 - Selected Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Quarterly Financial Information [Text Block]	'
	14.  Selected Quarterly Financial Data (Unaudited)
	The following is a summary of the Company’s quarterly consolidated results of operations (unaudited) for the fiscal years ended December 31, 2013 and 2012.
		Year Ended December 31, 2013
		Q1		Q2		Q3		Q4
		(In thousands, except for per share amounts)
	Total revenues	$	24,110	$	24,776	$	25,489	$	27,078
	Gross profit	$	14,453	$	15,035	$	14,982	$	17,513
	Net income	$	4,731	$	4,552	$	4,824	$	6,822
	Net income per share:
	Basic	$	0.16	$	0.15	$	0.16	$	0.23
	Diluted	$	0.15	$	0.15	$	0.15	$	0.21
		Year Ended December 31, 2012
		Q1		Q2		Q3		Q4
		(In thousands, except for per share amounts)
	Total revenues	$	20,643	$	22,531	$	22,551	$	23,815
	Gross profit	$	11,915	$	13,625	$	13,094	$	14,409
	Net income	$	3,499	$	4,820	$	4,993	$	23,899
	Net income per share:
	Basic	$	0.12	$	0.17	$	0.17	$	0.82
	Diluted	$	0.12	$	0.16	$	0.17	$	0.78

Accounting_Policies_by_Policy_

Accounting Policies, by Policy (Policies)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Basis of Accounting, Policy [Policy Text Block]	'
	Basis of Presentation  — The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries after the elimination of all significant intercompany balances and transactions.
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 revenue recognition for fixed-price solution implementation service contracts, stock-based compensation expense and accounting for income taxes. Actual results could differ from those estimates.
Concentration Risk, Credit Risk, Policy [Policy Text Block]	'
	Concentration of Credit Risk  — Financial instruments that potentially expose the Company to concentrations of credit risk consist primarily of cash and cash equivalents and accounts receivable. The Company maintains its cash and cash equivalents with what it considers high credit quality financial institutions.
	The Company primarily sells its technologies and services to companies in Asia, Europe and North America within the semiconductor industry. As of December 31, 2013, three customers accounted for 76% of the Company’s gross accounts receivable and three customers accounted for 74% of the Company’s revenues for 2013. As of December 31, 2012, three customers accounted for 71% of the Company’s gross accounts receivable and three customers accounted for 73% of the Company’s revenues for 2012. See Note 11 for further details. The Company does not require collateral or other security to support accounts receivable. To reduce credit risk, management performs ongoing credit evaluations of its customers’ financial condition. The Company maintains allowances for potential credit losses.  The allowance for doubtful accounts, which was based on management’s best estimates, could be adjusted in the near term from current estimates depending on actual experience. Such adjustments could be material to the consolidated financial statements.
Cash and Cash Equivalents, Policy [Policy Text Block]	'
	Cash, Cash Equivalents and Short-term Investments — The Company considers all highly liquid investments with an original maturity of 90 days or less or investments with a remaining maturity of 90 days or less at the time of purchase to be cash equivalents. Investments with maturities greater than three months and less than one year are classified as short-term investments.
Property, Plant and Equipment, Policy [Policy Text Block]	'
	Property and Equipment  — Property and equipment are stated at cost and are depreciated using the straight-line method over the estimated useful lives of the related asset as follows:
	Computer equipment (years)	3
	Software (years)	3
	Furniture, fixtures, and equipment (years)	5	-	7
	Leasehold improvements	Shorter of estimated useful life or term of lease
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]	'
	Long-lived Assets  — The Company’s long-lived assets, excluding goodwill, consist of property and equipment and other acquired intangibles. The Company periodically reviews its long-lived assets for impairment. For assets to be held and used, the Company initiates its review whenever events or changes in circumstances indicate that the carrying amount of a long-lived asset group may not be recoverable. Recoverability of an asset group is measured by comparison of its carrying amount to the expected future undiscounted cash flows that the asset group is expected to generate. If it is determined that an asset group is not recoverable, an impairment loss is recorded in the amount by which the carrying amount of the asset group exceeds its fair value.
Segment Reporting, Policy [Policy Text Block]	'
	As discussed in Note 11, the Company considers itself to be in one operating segment. In addition, the Company has determined that its operating segment is also its reporting unit as the operating segment comprises only a single component. To determine the reporting unit’s fair value, the Company used the income valuation approach. In determining its overall conclusion of reporting unit’s fair value, the Company also considers the estimated value derived from the market valuation approach as compared to the valuation under the income approach as one measure that the estimated fair value is reasonable.
	The income approach provides an estimate of fair value based on discounted expected future cash flows. Estimates and assumptions with respect to the determination of the fair value of the Company’s reporting unit using the income approach include the Company’s operating forecasts, revenue growth rates, and risk-commensurate discount rates and costs of capital. The Company’s estimates of revenues and costs are based on historical data, various internal estimates and a variety of external sources, and are developed as part of the Company’s routine long-range planning process.
	The market approach provides an estimate of the fair value of the Company’s reporting unit using various prices or market multiples applied to the reporting unit’s operating results and then applying an appropriate control premium, which is determined by considering control premiums offered as part of acquisitions in both the Company’s market segment and comparable market segments.
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 — Revenues that are derived from Design-to-silicon-yield solutions come from services and software licenses. The Company recognizes revenue for each element 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.
Receivables, Policy [Policy Text Block]	'
	Accounts Receivable  — Accounts receivable includes amounts that are unbilled at the end of the period. Unbilled accounts receivable are determined on an individual contract basis and were approximately $8.0 million and $7.7 million at December 31, 2013 and 2012, respectively. The Company performs ongoing credit evaluations of its customers’ financial condition. An allowance for doubtful accounts is maintained for probable credit losses based upon the Company’s assessment of the expected collectability of the accounts receivable. The allowance for doubtful accounts is reviewed on a quarterly basis to assess the adequacy of the allowance.
	Allowance for doubtful accounts are summarized below:
		Balance at			Charged		Deductions/		Balance
		Beginning			to Costs		Write-offs		at End
		of Period			and Expenses		of Accounts		of Period
	Allowance for doubtful accounts
	2013	$	351		$	3	$	—	$	354
	2012	$	254		$	97	$	—	$	351
	2011	$	254		$	—	$	—	$	254
Research, Development, and Computer Software, Policy [Policy Text Block]	'
	Software Development Costs  — Costs for the development of new software products and substantial enhancements to existing software products are expensed as incurred until technological feasibility has been established, at which time any additional costs would be capitalized. Because the Company believes its current process for developing software is essentially completed concurrently with the establishment of technological feasibility, no costs have been capitalized to date.
Research and Development Expense, Policy [Policy Text Block]	'
	Research and Development  — Research and development expenses are charged to operations as incurred.
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]	'
	Stock-Based Compensation  — 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. As stock-based compensation expense recognized is based on awards ultimately expected to vest, it has been reduced for estimated forfeitures. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. The Company has elected to use the Black-Scholes-Merton option-pricing model, which incorporates various assumptions including volatility, expected life and interest rates. The expected volatility is based on the historical volatility of the Company’s common stock over the most recent period commensurate with the estimated expected life of the Company’s stock options. The expected life of an award is based on historical experience and on the terms and conditions of the stock awards granted to employees. The interest rate assumption is based upon observed Treasury yield curve rates appropriate for the expected life of the Company’s stock options.
Income Tax, Policy [Policy Text Block]	'
	Income Taxes – The Company's provision for income tax comprises its current tax liability and change in deferred tax assets and liabilities. Deferred tax assets and liabilities are recognized for the expected tax consequences of temporary differences between the tax bases of assets and liabilities. The measurement of current and deferred tax assets and liabilities is based on provisions of enacted tax laws; the effect of future changes in tax laws or rates are not anticipated. Valuation allowances are provided to reduce deferred tax assets to an amount that in management’s judgment is more likely than not to be recoverable against future taxable income. No U.S. taxes are provided on earnings of non-U.S. subsidiaries, to the extent such earnings are deemed to be permanently invested. The Company's income tax calculations are based on application of the respective U.S. federal, state or foreign tax laws. The Company’s tax filings, however, are subject to audit by the respective tax authorities.  Accordingly, the Company recognizes tax liabilities based upon its estimate of whether, and the extent to which, additional taxes will be due when such estimates are more-likely-than-not to be sustained. An uncertain income tax position will not be recognized if it has less than a 50% likelihood of being sustained. To the extent the final tax liabilities are different than the amounts originally accrued, the increases or decreases are recorded as income tax expense or benefit in the consolidated statements of operations.
Earnings Per Share, Policy [Policy Text Block]	'
	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. Dilutive potential common shares consist of incremental common shares issuable upon exercise of stock options, upon vesting of restricted stock units, contingently issuable shares for all periods and assumed issuance of shares under employee stock purchase plan. No dilutive potential common shares are included in the computation of any diluted per share amount when a loss from continuing operations was reported by the Company.
Foreign Currency Transactions and Translations Policy [Policy Text Block]	'
	Foreign Currency Translation  — The functional currency of the Company’s foreign subsidiaries is the local currency for the respective subsidiary. The assets and liabilities are translated at the period-end exchange rate, and statements of operations are translated at the average exchange rate during the year. Gains and losses resulting from foreign currency translations are included as a component of other comprehensive income (loss). Gains and losses resulting from foreign currency transactions are included in the consolidated statement of operations.
Derivatives, Policy [Policy Text Block]	'
	Derivative Financial Instruments — The Company operates internationally and is exposed to potentially adverse movements in foreign currency exchange rates. The Company enters into foreign currency forwards contracts to reduce the exposure to foreign currency exchange rate fluctuations on certain foreign currency denominated monetary assets and liabilities. The Company does not use foreign currency contracts for speculative or trading purposes. The Company records these forward contracts at fair value. The counterparty to these foreign currency forward contracts is a large global financial institution that the Company believes is creditworthy, and therefore, we believe the credit risk of counterparty non-performance is not significant. These foreign currency forward contracts are not designated for hedge accounting treatment. Therefore, the change in fair value of these derivatives is recorded into earnings as a component of other income (expense), net and offsets the change in fair value of the foreign currency denominated monetary assets and liabilities, which are also recorded in other income (expense), net. The duration of these forward contracts is usually between two to three months.
Legal Costs, Policy [Policy Text Block]	'
	Litigation  — The Company is involved in certain legal proceedings. The Company records the estimated liability in its consolidated financial statements if the Company believes that a loss arising from such matters is probable and can be reasonably estimated. If only a range of estimated losses can be determined, the Company records an amount within the range that, in its judgment, reflects the most likely outcome; if none of the estimates within that range is a better estimate than any other amount, the Company records the low end of the range. Any such accrual would be charged to expense in the appropriate period. The Company recognizes litigation expenses in the period in which the litigation services were provided.
New Accounting Pronouncements, Policy [Policy Text Block]	'
	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 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 to be 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.

Note_1_Basis_of_Presentation_T

Note 1 - Basis of Presentation (Tables)	12 Months Ended
	Dec. 31, 2013
Note 1 - Basis of Presentation (Tables) [Line Items]	'
Schedule of Property and Equipment Estimated Useful Lives	'
	Computer equipment (years)	3
	Software (years)	3
	Furniture, fixtures, and equipment (years)	5	-	7
	Leasehold improvements	Shorter of estimated useful life or term of lease
Allowance for Doubtful Accounts [Member]	'
Note 1 - Basis of Presentation (Tables) [Line Items]	'
Summary of Valuation Allowance [Table Text Block]	'
		Balance at			Charged		Deductions/		Balance
		Beginning			to Costs		Write-offs		at End
		of Period			and Expenses		of Accounts		of Period
	Allowance for doubtful accounts
	2013	$	351		$	3	$	—	$	354
	2012	$	254		$	97	$	—	$	351
	2011	$	254		$	—	$	—	$	254

Note_2_Property_and_Equipment_

Note 2 - Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Abstract]	'
Property, Plant and Equipment [Table Text Block]	'
		December 31,
		2013			2012
	Computer equipment	$	9,969		$	10,319
	Software		3,441			3,552
	Furniture, fixtures, and equipment		734			971
	Leasehold improvements		1,052			1,021
	Test equipment		4,928			2,005
	Construction-in-progress		1,421			864
			21,545			18,732
	Accumulated depreciation and amortization		(14,481	)		(14,834	)
		$	7,064		$	3,898

Note_3_Intangible_Assets_Table

Note 3 - Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2013
Disclosure Text Block [Abstract]	'
Schedule of Finite-Lived Intangible Assets [Table Text Block]	'
					31-Dec-13
		Amortization			Gross		Accumulated			Net
		Period			Carrying		Amortization			Carrying
		(Years)			Amount					Amount
	Acquired identifiable intangibles:
	Acquired technology	4	-	5	$	11,800	$	(11,800	)	$	—
	Brand name		4			510		(510	)		—
	Customer relationships and backlog	1	-	6		3,420		(3,420	)		—
	Patents and applications		7			1,400		(1,369	)		31
	Other acquired intangibles		4			255		(255	)		—
	Total				$	17,385	$	(17,354	)	$	31
					31-Dec-12
		Amortization			Gross		Accumulated			Net
		Period			Carrying		Amortization			Carrying
		(Years)			Amount					Amount
	Acquired identifiable intangibles:
	Acquired technology	4	-	5	$	11,800	$	(11,800	)	$	—
	Brand name		4			510		(510	)		—
	Customer relationships and backlog	1	-	6		3,420		(3,420	)		—
	Patents and applications		7			1,400		(1,296	)		104
	Other acquired intangibles		4			255		(255	)		—
	Total				$	17,385	$	(17,281	)	$	104

Note_4_Accrued_and_Other_Curre1

Note 4 - Accrued and Other Current Liabilities (Tables)	12 Months Ended
	Dec. 31, 2013
Other Liabilities and Financial Instruments Subject to Mandatory Redemption [Abstract]	'
Schedule of Accrued Liabilities [Table Text Block]	'
		December 31,
		2013		2012
	Current portion of accrued restructuring	$	13	$	1,344
	Other current liabilities		1,580		1,538
	Total accrued and other current liabilities	$	1,593	$	2,882

Note_5_Other_NonCurrent_Liabil1

Note 5 - Other Non-Current Liabilities (Tables)	12 Months Ended
	Dec. 31, 2013
Disclosure Text Block Supplement [Abstract]	'
Other Noncurrent Liabilities [Table Text Block]	'
		December 31,
		2013		2012
	Non-current portion of deferred rent	$	384	$	41
	Non-current portion of deferred revenues		244		239
	Total other non-current liabilities	$	628	$	280

Note_6_Commitments_and_Conting1

Note 6 - Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	'
	Year Ending December 31,
	2014	$	1,713
	2015		1,628
	2016		1,632
	2017		1,350
	2018		735
	Total future minimum lease payments	$	7,058

Note_7_Stockholders_Equity_Tab

Note 7 - Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2013
Disclosure Text Block Supplement [Abstract]	'
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]	'
		Years Ended December 31,
		2013			2012			2011
	Cost of Design-to-silicon-yield solutions	$	2,736		$	1,786		$	1,923
	Research and development		1,583			1,083			1,197
	Selling, general and administrative		2,374			2,022			1,671
	Stock-based compensation expense	$	6,693		$	4,891		$	4,791
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	'
		Stock Plans									Employee Stock
											Purchase Plan
		2013			2012			2011			2013			2012			2011
	Expected life (in years)		4.8			4.8			4.9			1.25			1.25			1.25
	Volatility		54.1	%		59.2	%		61.1	%		45.3	%		51.6	%		57.7	%
	Risk-free interest rate		1.03	%		0.77	%		1.52	%		0.19	%		0.18	%		0.46	%
	Expected dividend		—			—			—			—			—			—
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]	'
		Outstanding Options
		Number of			Weighted			Weighted			Aggregate
		Options			Average			Average			Intrinsic Value
		(in thousands)			Exercise Price			Remaining			(in thousands)
					per Share			Contractual
								Term (years)
	Outstanding, January 1, 2011		3,453			5.6
	Granted (weighted average fair value of $3.15 per share)		1,165			6.09
	Exercised		(531	)		4.33
	Canceled		(162	)		4.59
	Expired		(53	)		9.02
	Outstanding, December 31, 2011		3,872			5.91
	Granted (weighted average fair value of $4.38 per share)		1,216			8.8
	Exercised		(1,019	)		5.42
	Canceled		(216	)		6.34
	Expired		(43	)		9.78
	Outstanding, December 31, 2012		3,810			6.91
	Granted (weighted average fair value of $7.75 per share)		77			17.12
	Exercised		(871	)		6.13
	Canceled		(114	)		8.76
	Expired		(22	)		5.98
	Outstanding, December 31, 2013		2,880			7.35			6.57		$	52,613
	Vested and expected to vest, December 31, 2013		2,805			7.31			6.52		$	51,352
	Exercisable, December 31, 2013		1,838			6.79			5.7		$	34,615
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]	'
		Shares			Weighted-
		(in			Average
		thousands)			Grant-Date
					Fair Value
	Nonvested, January 1, 2011		453			7.29
	Granted		292			6.18
	Vested		(414	)		6.12
	Forfeited		(28	)		6.89
	Nonvested, December 31, 2011		303			7.82
	Granted		359			8.97
	Vested		(172	)		9.87
	Forfeited		(40	)		7.66
	Nonvested, December 31, 2012		450			7.97
	Granted		562			18.25
	Vested		(217	)		11.01
	Forfeited		(36	)		11.08
	Nonvested, December 31, 2013
			759			14.44

Note_8_Restructuring_Tables

Note 8 - Restructuring (Tables)	12 Months Ended
	Dec. 31, 2013
October 2012 Plan [Member]	'
Note 8 - Restructuring (Tables) [Line Items]	'
Restructuring and Related Costs [Table Text Block]	'
		Severance			Professional			Total
					and Other
					Fees
	Balances, January 1, 2012	$	—		$	—		$	—
	Restructuring charges		1,733			73			1,806
	Payments		(848	)		(62	)		(910	)
	Balances, December 31, 2012	$	885		$	11		$	896
	Restructuring charges		249			51			300
	Payments		(1,121	)		(62	)		(1,183	)
	Balances, December 31, 2013	$	13		$	—		$	13
October 2008 Plan [Member]	'
Note 8 - Restructuring (Tables) [Line Items]	'
Restructuring and Related Costs [Table Text Block]	'
		Severance			Facility			Professional			Total
					Exit			and Other
								Fees
	Balances, January 1, 2011	$	110		$	1,264		$	5		$	1,379
	Restructuring credits		—			(105	)		(5	)		(110	)
	Adjustments		—			32			—			32
	Payments		(7	)		(566	)		—			(573	)
	Balances, December 31, 2011	$	103		$	625		$	—		$	728
	Restructuring charges		—			83			—			83
	Adjustments		—			173			—			173
	Payments		—			(536	)		—			(536	)
	Balances, December 31, 2012	$	103		$	345		$	—		$	448
	Restructuring credits		(103	)		—			—			(103	)
	Adjustments		—			4			—			4
	Payments		—			(349	)		—			(349	)
	Balances, December 31, 2013	$	—		$	—		$	—		$	—

Note_9_Income_Taxes_Tables

Note 9 - Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2013
Note 9 - Income Taxes (Tables) [Line Items]	'
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	'
		Year Ended December 31,
		2013			2012			2011
		(In thousands)
	U.S.
	Current	$	719		$	271		$	(237	)
	Deferred		5,432			(19,863	)		—
	Foreign
	Current		291			512			207
	Withholding		3,830			948			2,448
	Deferred		108			(197	)		21
	Total provision (benefit)	$	10,380		$	(18,329	)	$	2,439
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	'
		Year Ended December 31,
		2013			2012			2011
	Federal statutory tax provision	$	10,958		$	6,609		$	1,511
	State tax provision (benefit)		581			(925	)		19
	Stock compensation expense		393			644			186
	Tax credits		(5,424	)		(722	)		(3,297	)
	Foreign tax, net		3,884			906			2,171
	Change in valuation allowance		—			(25,223	)		1,794
	Other		(12	)		382			55
	Tax provision (benefit)	$	10,380		$	(18,329	)	$	2,439
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	'
		December 31,
		2013			2012
	Net operating loss carry forward	$	621		$	704
	Research and development and other credit carry forward		6,938			10,839
	Foreign tax credit carry forward		—			135
	Accruals deductible in different periods		3,453			3,897
	Intangible assets		6,105			6,996
	Stock-based compensation		2,491			2,198
	Valuation allowance		(5,087	)		(4,708	)
	Total	$	14,521		$	20,061
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]	'
		Amount
	Gross unrecognized tax benefits, January 1, 2011	$	9,407
	Increases in tax positions for current year		777
	Increase in tax positions for prior years		38
	Lapse in statute of limitations		(578	)
	Gross unrecognized tax benefits, December 31, 2011		9,644
	Increases in tax positions for current year		616
	Increases in tax positions for prior years	—
	Lapse in statute of limitations		(707	)
	Gross unrecognized tax benefits, December 31, 2012		9,553
	Increases in tax positions for current year		1,052
	Increases in tax positions for prior years	—
	Lapse in statute of limitations		(389	)
	Gross unrecognized tax benefits, December 31, 2013	$	10,216
Valuation Allowance of Deferred Tax Assets [Member]	'
Note 9 - Income Taxes (Tables) [Line Items]	'
Summary of Valuation Allowance [Table Text Block]	'
		Balance at			Charged			Deductions/			Balance
		Beginning			to Costs			Write-offs			at End
		of Period			and Expenses			of Accounts			of Period
	Valuation allowance for deferred tax assets
	2013	$	4,708		$	379		$	—		$	5,087
	2012		30,731			—			(26,023	)		4,708
	2011		30,837			—			(106	)		30,731

Note_10_Net_Income_Loss_Per_Sh1

Note 10 - Net Income (Loss) Per Share (Tables)	12 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	'
		Year Ended December 31,
		2013		2012		2011
	Numerator:
	Net income	$	20,929	$	37,211	$	1,880
	Numerator:
	Basic weighted-average shares outstanding		29,826		28,700		28,086
	Effect of dilutive options and restricted stock		1,567		1,109		345
	Diluted weighted-average shares outstanding		31,393		29,809		28,431
	Net income per share - Basic	$	0.7	$	1.3	$	0.07
	Net income per share - Diluted	$	0.67	$	1.25	$	0.07
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]	'
		December 31,
		2013		2012
	Outstanding options		49		1,275
	Nonvested shares of restricted stock units		4		20
	Employee Stock Purchase Plan		7		—
	Total		60		1,295

Note_11_Customer_and_Geographi1

Note 11 - Customer and Geographic Information (Tables)	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Disclosure on Geographic Areas, Description of Revenue from External Customers	'
		Year Ended December 31,
	Customer	2013			2012			2011
	A		33	%		40	%		24	%
	B		24	%		13	%		15	%
	C		17	%		20	%		19	%
Disclosure on Geographic Areas, Long-Lived Assets	'
		December 31,
	Customer	2013			2012
	A		36	%		42	%
	B		23	%		11	%
	C		17	%		18	%
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]	'
		Year Ended December 31,
		2013						2012						2011
		Revenues			Percentage of			Revenues			Percentage of			Revenues		Percentage of
					Revenues						Revenues					Revenues
	North America	$	39,058			38	%	$	35,533			40	%	$	21,391		32	%
	Germany		22,431			22			25,928			29			12,039		18
	South Korea		20,953			21			9,160			10			11,407		17
	Japan		8,340			8			8,514			10			8,354		13
	Rest of Asia		6,920			7			6,302			7			7,601		11
	Rest of Europe		3,751			4			4,103			4			5,920		9
	Total revenue	$	101,453			100	%	$	89,540			100	%	$	66,712		100	%
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]	'
		December 31,
		2013			2012
	North America	$	6,578		$	3,527
	Asia		364			295
	Europe		122			76
	Total long-lived assets, net	$	7,064		$	3,898

Note_12_Financial_Instruments_

Note 12 - Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Fair Value, Assets Measured on Recurring Basis [Table Text Block]	'
	Assets	Total		Quoted Prices in		Significant Other		Significant
				Active Markets for		Observable Inputs		Unobservable Inputs
				Identical Assets		(Level 2)		(Level 3)
				(Level 1)
	Money market mutual funds	$	26,353	$	26,353	$	—	$	—
	Assets	Total		Quoted Prices in		Significant Other		Significant
				Active Markets for		Observable Inputs		Unobservable Inputs
				Identical Assets		(Level 2)		(Level 3)
				(Level 1)
	Money market mutual funds	$	26,341	$	26,341	$	—	$	—

Note_14_Selected_Quarterly_Fin1

Note 14 - Selected Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Schedule of Quarterly Financial Information [Table Text Block]	'
		Year Ended December 31, 2013
		Q1		Q2		Q3		Q4
		(In thousands, except for per share amounts)
	Total revenues	$	24,110	$	24,776	$	25,489	$	27,078
	Gross profit	$	14,453	$	15,035	$	14,982	$	17,513
	Net income	$	4,731	$	4,552	$	4,824	$	6,822
	Net income per share:
	Basic	$	0.16	$	0.15	$	0.16	$	0.23
	Diluted	$	0.15	$	0.15	$	0.15	$	0.21
		Year Ended December 31, 2012
		Q1		Q2		Q3		Q4
		(In thousands, except for per share amounts)
	Total revenues	$	20,643	$	22,531	$	22,551	$	23,815
	Gross profit	$	11,915	$	13,625	$	13,094	$	14,409
	Net income	$	3,499	$	4,820	$	4,993	$	23,899
	Net income per share:
	Basic	$	0.12	$	0.17	$	0.17	$	0.82
	Diluted	$	0.12	$	0.16	$	0.17	$	0.78

Note_1_Basis_of_Presentation_D

Note 1 - Basis of Presentation (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Note 1 - Basis of Presentation (Details) [Line Items]	'	'
Number of Operating Segments	1	'
Unbilled Receivables, Current (in Dollars)	8	7.7
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	'4 years	'
Customer Concentration Risk [Member] | Accounts Receivable [Member]	'	'
Note 1 - Basis of Presentation (Details) [Line Items]	'	'
Concentration Risk, Percentage	76.00%	71.00%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]	'	'
Note 1 - Basis of Presentation (Details) [Line Items]	'	'
Concentration Risk, Percentage	74.00%	73.00%

Note_1_Basis_of_Presentation_D1

Note 1 - Basis of Presentation (Details) - Estimated Useful Lives - Property and Equipment	12 Months Ended
	Dec. 31, 2013
Computer Equipment [Member] | Minimum [Member]	'
Note 1 - Basis of Presentation (Details) - Estimated Useful Lives - Property and Equipment [Line Items]	'
Estimated lives	'3 years
Software [Member] | Minimum [Member]	'
Note 1 - Basis of Presentation (Details) - Estimated Useful Lives - Property and Equipment [Line Items]	'
Estimated lives	'3 years
Furniture and Fixtures [Member] | Minimum [Member]	'
Note 1 - Basis of Presentation (Details) - Estimated Useful Lives - Property and Equipment [Line Items]	'
Estimated lives	'5 years
Furniture and Fixtures [Member] | Maximum [Member]	'
Note 1 - Basis of Presentation (Details) - Estimated Useful Lives - Property and Equipment [Line Items]	'
Estimated lives	'7 years
Leasehold Improvements [Member] | Minimum [Member]	'
Note 1 - Basis of Presentation (Details) - Estimated Useful Lives - Property and Equipment [Line Items]	'
Leasehold improvements	'Shorter of estimated useful life or term of lease

Note_1_Basis_of_Presentation_D2

Note 1 - Basis of Presentation (Details) - Allowance for Doubtful Accounts (Allowance for Doubtful Accounts [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2010
Allowance for Doubtful Accounts [Member]	'	'	'
Valuation Allowance [Line Items]	'	'	'
Balance at Beginning of Period	$351	$254	$254
Charged to Costs and Expenses	3	97	'
Balance at End of Period	$354	$351	$254

Note_2_Property_and_Equipment_1

Note 2 - Property and Equipment (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Abstract]	'	'	'
Depreciation, Depletion and Amortization, Nonproduction	$1.40	$0.50	$0.50

Note_2_Property_and_Equipment_2

Note 2 - Property and Equipment (Details) - Property and Equipment (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Property and Equipment [Abstract]	'	'
Computer equipment	$9,969	$10,319
Software	3,441	3,552
Furniture, fixtures, and equipment	734	971
Leasehold improvements	1,052	1,021
Test equipment	4,928	2,005
Construction-in-progress	1,421	864
	21,545	18,732
Accumulated depreciation and amortization	-14,481	-14,834
	$7,064	$3,898

Note_3_Intangible_Assets_Detai

Note 3 - Intangible Assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure Text Block [Abstract]	'	'	'
Amortization of Intangible Assets	$74,000	$434,000	$830,000
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$31,000	'	'

Note_3_Intangible_Assets_Detai1

Note 3 - Intangible Assets (Details) - Intangible Assets (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Acquired identifiable intangibles:	'	'
Gross carrying amount	$17,385	$17,385
Accumulated amortization	-17,354	-17,281
Net carrying amount	31	104
Acquired Technology [Member]	'	'
Acquired identifiable intangibles:	'	'
Amortization period	'	'
Gross carrying amount	11,800	11,800
Accumulated amortization	-11,800	-11,800
Brand Name [Member]	'	'
Acquired identifiable intangibles:	'	'
Amortization period	'4 years	'4 years
Gross carrying amount	510	510
Accumulated amortization	-510	-510
Customer Relationships [Member]	'	'
Acquired identifiable intangibles:	'	'
Amortization period	'	'
Gross carrying amount	3,420	3,420
Accumulated amortization	-3,420	-3,420
Patents [Member]	'	'
Acquired identifiable intangibles:	'	'
Amortization period	'7 years	'7 years
Gross carrying amount	1,400	1,400
Accumulated amortization	-1,369	-1,296
Net carrying amount	31	104
Other Intangible Assets [Member]	'	'
Acquired identifiable intangibles:	'	'
Amortization period	'4 years	'4 years
Gross carrying amount	255	255
Accumulated amortization	($255)	($255)
Minimum [Member] | Acquired Technology [Member]	'	'
Acquired identifiable intangibles:	'	'
Amortization period	'4 years	'4 years
Minimum [Member] | Customer Relationships [Member]	'	'
Acquired identifiable intangibles:	'	'
Amortization period	'1 year	'1 year
Maximum [Member] | Acquired Technology [Member]	'	'
Acquired identifiable intangibles:	'	'
Amortization period	'5 years	'5 years
Maximum [Member] | Customer Relationships [Member]	'	'
Acquired identifiable intangibles:	'	'
Amortization period	'6 years	'6 years

Note_4_Accrued_and_Other_Curre2

Note 4 - Accrued and Other Current Liabilities (Details) - Accrued and Other Current Liabilities (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Accrued and Other Current Liabilities [Abstract]	'	'
Current portion of accrued restructuring	$13	$1,344
Other current liabilities	1,580	1,538
Total accrued and other current liabilities	$1,593	$2,882

Note_5_Other_NonCurrent_Liabil2

Note 5 - Other Non-Current Liabilities (Details) - Other Noncurrent Liabilities (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Other Noncurrent Liabilities [Abstract]	'	'
Non-current portion of deferred rent	$384	$41
Non-current portion of deferred revenues	244	239
Total other non-current liabilities	$628	$280

Note_6_Commitments_and_Conting2

Note 6 - Commitments and Contingencies (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]	'	'	'
Operating Leases, Rent Expense, Net	$2	$2.20	$2.40
Purchase Obligation, Due in Next Twelve Months	$1.80	'	'

Note_6_Commitments_and_Conting3

Note 6 - Commitments and Contingencies (Details) - Future Minimum Lease Payments Under Noncancelable Operating Leases (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Future Minimum Lease Payments Under Noncancelable Operating Leases [Abstract]	'
2014	$1,713
2015	1,628
2016	1,632
2017	1,350
2018	735
Total future minimum lease payments	$7,058

Note_7_Stockholders_Equity_Det

Note 7 - Stockholders' Equity (Details) (USD $)

0 Months Ended

1 Months Ended

9 Months Ended

12 Months Ended

12 Months Ended

9 Months Ended

1 Months Ended

25 Months Ended

12 Months Ended

25 Months Ended

Nov. 08, 2012

Oct. 29, 2012

Sep. 30, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Nov. 16, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Sep. 30, 2013

Oct. 29, 2007

Oct. 29, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Nov. 16, 2011

Stock Appreciation Rights (SARs) [Member]

Stock Appreciation Rights (SARs) [Member]

2011 Stock Incentive Plan [Member]

IDS Plan [Member]

Employee Stock Option [Member]

Employee Stock Option [Member]

Employee Stock Option [Member]

Restricted Stock [Member]

Employee Stock Purchase Plan [Member]

Stock Repurchase Program [Member]

Stock Repurchase Program [Member]

Employee Stock Purchase Plan [Member]

Employee Stock Purchase Plan [Member]

Employee Stock Purchase Plan [Member]

2001 Stock Incentive Plan [Member]

Shares Previously Issued Under the 2001 Plan [Member]

Note 7 - Stockholders' Equity (Details) [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Allocated Share-based Compensation Expense

'

'

'

$6,693,000

$4,891,000

$4,791,000

'

$102,000

$11,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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 (in Shares)

'

'

'

'

'

'

4,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3,500,000

Share Based Compensation Arrangement By Share Based Payment Award Shares Reserved Decrease Rate (in Shares)

'

'

'

1.33

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share Based Compensation Arrangement By Share Based Payment Award Expiration Term

'

'

'

'

'

'

'

'

'

'10 years

'10 years

'

'

'

'

'

'

'

'

'

'

'

'

Common Stock, Capital Shares Reserved for Future Issuance (in Shares)

'

'

'

'

'

'

'

'

'

5,200,000

'

'

'

'

'

'

'

'

4,500,000

'

'

'

'

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

'

'

'

2,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

114,000

216,000

162,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

400,000

'

Share Price (in Dollars per share)

'

'

'

$25.62

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

11,900,000

5,800,000

600,000

'

'

'

'

'

'

'

'

'

Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options

'

'

'

'

'

'

'

'

'

'

'

4,100,000

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

'2 years 25 days

'2 years 277 days

'

'2 years 295 days

'1 year 73 days

'

'

'

'

'

'

'

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

'

'

'

2,900,000

'

'

'

'

'

'

'

'

2,700,000

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

'

6,000,000

'

'

'

'

'

'

'

'

'

'

Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options

'

'

'

'

'

'

'

'

'

'

'

'

'

'

9,400,000

600,000

'

'

'

'

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

10.00%

'

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

85.00%

'

'

'

'

ESPP Maximum Annual Share Replenishment (in Shares)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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 (in Shares)

'

'

'

'

'

414,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

$7.16

$4.86

$2.09

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number Of ESPP Shares Available For Future Issuance (in Shares)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,300,000

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)

'

'

'

$7.75

$4.38

$3.15

'

'

'

'

'

'

'

'

'

'

'

'

$5.56

$3

$1.64

'

'

Share-based Compensation

'

'

'

6,693,000

4,891,000

4,791,000

'

'

'

'

'

'

'

'

'

'

'

'

600,000

400,000

400,000

'

'

Stock Repurchase Program, Authorized Amount

20,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

10,000,000

10,000,000

'

'

'

'

'

Stock Repurchase Program, Remaining Authorized Repurchase Amount

'

'

19,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

19,300,000

'

'

'

'

'

Stock Repurchased During Period, Shares (in 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

'

17,000,000

'

'

-4,368,000

-2,949,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

$13.23

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock Repurchased During Period, Value

'

'

$500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Note_7_Stockholders_Equity_Det1

Note 7 - Stockholders' Equity (Details) - Allocation of Recognized Period Costs (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Allocation of Recognized Period Costs	$6,693,000	$4,891,000	$4,791,000
Cost of Sales [Member]	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Allocation of Recognized Period Costs	2,736,000	1,786,000	1,923,000
Research and Development Expense [Member]	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Allocation of Recognized Period Costs	1,583,000	1,083,000	1,197,000
Selling, General and Administrative Expenses [Member]	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Allocation of Recognized Period Costs	$2,374,000	$2,022,000	$1,671,000

Note_7_Stockholders_Equity_Det2

Note 7 - Stockholders' Equity (Details) - Stock Options, Valuation Assumptions	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Stock Option [Member]	'	'	'
Note 7 - Stockholders' Equity (Details) - Stock Options, Valuation Assumptions [Line Items]	'	'	'
Expected life (in years)	'4 years 292 days	'4 years 292 days	'4 years 328 days
Volatility	54.10%	59.20%	61.10%
Risk-free interest rate	1.03%	0.77%	1.52%
Expected dividend	0.00%	0.00%	0.00%
Employee Stock Purchase Plan [Member]	'	'	'
Note 7 - Stockholders' Equity (Details) - Stock Options, Valuation Assumptions [Line Items]	'	'	'
Expected life (in years)	'1 year 3 months	'1 year 3 months	'1 year 3 months
Volatility	45.30%	51.60%	57.70%
Risk-free interest rate	0.19%	0.18%	0.46%
Expected dividend	0.00%	0.00%	0.00%

Note_7_Stockholders_Equity_Det3

Note 7 - Stockholders' Equity (Details) - Stock Options Activity (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock Options Activity [Abstract]	'	'	'
Outstanding, January 1, 2011	3,810	3,872	3,453
Outstanding, January 1, 2011 (in Dollars per share)	$6.91	$5.91	$5.60
Outstanding - Number of Options	2,880	3,810	3,872
Outstanding - Weighted Average Exercise Price per Share (in Dollars per share)	$7.35	$6.91	$5.91
Outstanding - Weighted Average Remaining Contractual Term	'6 years 208 days	'	'
Outstanding - Aggregate Intrinsic Value (in Dollars)	$52,613	'	'
Vested and expected to vest, December 31, 2013	2,805	'	'
Vested and expected to vest, December 31, 2013 (in Dollars per share)	$7.31	'	'
Vested and expected to vest, December 31, 2013	'6 years 189 days	'	'
Vested and expected to vest, December 31, 2013 (in Dollars)	51,352	'	'
Exercisable, December 31, 2013	1,838	'	'
Exercisable, December 31, 2013 (in Dollars per share)	$6.79	'	'
Exercisable, December 31, 2013	'5 years 255 days	'	'
Exercisable, December 31, 2013 (in Dollars)	$34,615	'	'
Granted Weighted Average Fair Value	77	1,216	1,165
Granted Weighted Average Fair Value (in Dollars per share)	$17.12	$8.80	$6.09
Exercised - Number of Options	-871	-1,019	-531
Exercised - Weighted Average Exercise Price per Share (in Dollars per share)	$6.13	$5.42	$4.33
Canceled - Number of Options	-114	-216	-162
Canceled - Weighted Average Exercise Price per Share (in Dollars per share)	$8.76	$6.34	$4.59
Expired - Number of Options	-22	-43	-53
Expired - Weighted Average Exercise Price per Share (in Dollars per share)	$5.98	$9.78	$9.02

Note_7_Stockholders_Equity_Det4

Note 7 - Stockholders' Equity (Details) - Stock Options Activity (Parentheticals) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock Options Activity [Abstract]	'	'	'
Granted, weighted average fair value	$7.75	$4.38	$3.15

Note_7_Stockholders_Equity_Det5

Note 7 - Stockholders' Equity (Details) - Nonvested Restricted Stock Units Activity (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Nonvested Restricted Stock Units Activity [Abstract]	'	'	'
Nonvested Balance, Shares	450	303	453
Nonvested Balance, Weighted-Average Grant-Date Fair Value (in Dollars per share)	$7.97	$7.82	$7.29
Granted, Shares	562	359	292
Granted, Weighted-Average Grant-Date Fair Value (in Dollars per share)	$18.25	$8.97	$6.18
Vested, Shares	-217	-172	-414
Vested, Weighted-Average Grant-Date Fair Value (in Dollars per share)	$11.01	$9.87	$6.12
Forfeited, Shares	-36	-40	-28
Forfeited, Weighted-Average Grant-Date Fair Value (in Dollars per share)	$11.08	$7.66	$6.89
Nonvested Balance, Shares	759	450	303
Nonvested Balance, Weighted-Average Grant-Date Fair Value (in Dollars per share)	$14.44	$7.97	$7.82

Note_8_Restructuring_Details

Note 8 - Restructuring (Details) (USD $)

12 Months Ended

1 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Oct. 24, 2012

Dec. 31, 2013

Dec. 31, 2012

Oct. 28, 2008

Oct. 28, 2008

Dec. 31, 2012

Dec. 31, 2011

Oct. 24, 2012

Dec. 31, 2013

Dec. 31, 2012

Oct. 28, 2008

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Employee Severance [Member]

Employee Severance [Member]

Employee Severance [Member]

Employee Severance [Member]

Facility Closing [Member]

Facility Closing [Member]

Facility Closing [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 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]

Note 8 - Restructuring (Details) [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Restructuring Charges

$197,000

$1,889,000

($110,000)

'

$249,000

$1,733,000

'

'

($83,000)

$105,000

'

$300,000

$1,806,000

'

$103,000

($83,000)

$110,000

Restructuring and Related Cost, Cost Incurred to Date

'

'

'

$2,000,000

'

'

$4,700,000

$2,700,000

'

'

$2,100,000

'

'

$7,400,000

'

'

'

Note_8_Restructuring_Details_S

Note 8 - Restructuring (Details) - Summary of Restructuring Liabilities (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
				October 2012 Plan [Member]	October 2012 Plan [Member]	October 2012 Plan [Member]	October 2012 Plan [Member]	October 2012 Plan [Member]	October 2012 Plan [Member]
				Employee Severance [Member]	Employee Severance [Member]	Professional And Other Fees [Member]	Professional And Other Fees [Member]
Restructuring Cost and Reserve [Line Items]	'	'	'	'	'	'	'	'	'
Restructuring charges	$197	$1,889	($110)	$249	$1,733	$51	$73	$300	$1,806
Payments	'	'	'	-1,121	-848	-62	-62	-1,183	-910
Balance	'	'	'	$13	$885	'	$11	$13	$896

Note_8_Restructuring_Details_S1

Note 8 - Restructuring (Details) - Summary of Restructuring Liabilities (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]	'	'	'
Restructuring credits/charges	($197)	($1,889)	$110
October 2008 Plan [Member] | Employee Relocation [Member]	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'
Balance	103	'	110
Restructuring credits/charges	-103	'	'
Payments	'	'	-7
Balance	'	'	103
October 2008 Plan [Member] | Facility Closing [Member]	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'
Balance	345	625	1,264
Restructuring credits/charges	'	83	-105
Adjustments	4	173	32
Payments	-349	-536	-566
Balance	'	345	625
October 2008 Plan [Member] | Professional And Other Fees [Member]	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'
Balance	'	'	5
Restructuring credits/charges	'	'	-5
October 2008 Plan [Member]	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'
Balance	448	728	1,379
Restructuring credits/charges	-103	83	-110
Adjustments	4	173	32
Payments	-349	-536	-573
Balance	'	$448	$728

Note_9_Income_Taxes_Details

Note 9 - Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Note 9 - Income Taxes (Details) [Line Items]	'	'	'	'
Income (Loss) from Continuing Operations before Income Taxes, Domestic	$29,600,000	$17,700,000	$2,900,000	'
Income (Loss) from Continuing Operations before Income Taxes, Foreign	1,700,000	1,200,000	1,400,000	'
Effective Income Tax Rate Reconciliation, Percent	35.00%	'	'	'
Valuation Allowance, Deferred Tax Asset, Change in Amount	'	19,900,000	'	'
Deferred Tax Assets, Valuation Allowance	5,087,000	4,708,000	'	'
Deferred Tax Assets, Net of Valuation Allowance	14,521,000	20,061,000	'	'
Deferred Tax Assets, Net, Current	5,900,000	3,600,000	'	'
Deferred Tax Assets, Net, Noncurrent	8,600,000	16,500,000	'	'
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	466,000	'	'	'
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	39,000	-16,000	-19,000	'
Unrecognized Tax Benefits	10,216,000	9,553,000	9,644,000	9,407,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	6,300,000	6,000,000	'	'
Unrecognized Tax Benefits In Long Term Liabilities	3,000,000	'	'	'
Unrecognized Tax Benefits In Deferred Tax Assets	7,700,000	'	'	'
Unrecognized Tax Benefits In Deferred Tax Asset Subject To Full Valuation Allowance	3,900,000	'	'	'
Undistributed Earnings of Foreign Subsidiaries	4,000,000	'	'	'
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member]	'	'	'	'
Note 9 - Income Taxes (Details) [Line Items]	'	'	'	'
Tax Credit Carryforward, Amount	11,600,000	'	'	'
State and Local Jurisdiction [Member]	'	'	'	'
Note 9 - Income Taxes (Details) [Line Items]	'	'	'	'
Operating Loss Carryforwards	'	7,400,000	'	'
Deferred Tax Assets, Valuation Allowance	5,100,000	4,700,000	'	'
Unrecorded Windfall Deductions	78,000	'	'	'
Excluded Windfall Deductions	'	23,000	'	'
Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member]	'	'	'	'
Note 9 - Income Taxes (Details) [Line Items]	'	'	'	'
Tax Credit Carryforward, Amount	10,600,000	'	'	'
Domestic Tax Authority [Member]	'	'	'	'
Note 9 - Income Taxes (Details) [Line Items]	'	'	'	'
Unrecorded Windfall Deductions	4,900,000	'	'	'
Excluded Windfall Deductions	'	1,700,000	'	'
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	'	$426,000	'	'

Note_9_Income_Taxes_Details_In

Note 9 - Income Taxes (Details) - Income Tax Expense (Benefit) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
U.S.	'	'	'
Current	$719	$271	($237)
Deferred	5,432	-19,863	'
Foreign	'	'	'
Current	291	512	207
Withholding	3,830	948	2,448
Deferred	108	-197	21
Total provision (benefit)	$10,380	($18,329)	$2,439

Note_9_Income_Taxes_Details_In1

Note 9 - Income Taxes (Details) - Income Tax Reconciliation (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Reconciliation [Abstract]	'	'	'
Federal statutory tax provision	$10,958	$6,609	$1,511
State tax provision (benefit)	581	-925	19
Stock compensation expense	393	644	186
Tax credits	-5,424	-722	-3,297
Foreign tax, net	3,884	906	2,171
Change in valuation allowance	'	-25,223	1,794
Other	-12	382	55
Tax provision (benefit)	$10,380	($18,329)	$2,439

Note_9_Income_Taxes_Details_De

Note 9 - Income Taxes (Details) - Deferred Tax Assets (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Deferred Tax Assets [Abstract]	'	'
Net operating loss carry forward	$621	$704
Research and development and other credit carry forward	6,938	10,839
Foreign tax credit carry forward	'	135
Accruals deductible in different periods	3,453	3,897
Intangible assets	6,105	6,996
Stock-based compensation	2,491	2,198
Valuation allowance	-5,087	-4,708
Total	$14,521	$20,061

Note_9_Income_Taxes_Details_Un

Note 9 - Income Taxes (Details) - Unrecognized Tax Benefits (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Unrecognized Tax Benefits [Abstract]	'	'	'
Gross unrecognized tax benefits	$9,553	$9,644	$9,407
Increase in tax positions for prior years	'	'	38
Lapse in statute of limitations	-389	-707	-578
Increases in tax positions for current year	1,052	616	777
Gross unrecognized tax benefits	$10,216	$9,553	$9,644

Note_9_Income_Taxes_Details_Va

Note 9 - Income Taxes (Details) - Valuation Allowance of Deferred Tax Assets (Valuation Allowance of Deferred Tax Assets [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Valuation Allowance of Deferred Tax Assets [Member]	'	'	'
Valuation Allowance [Line Items]	'	'	'
Balance at Beginning of Period	$4,708	$30,731	$30,837
Charged to Cost and Expenses	379	'	'
Deductions/Write-offs of Accounts	'	-26,023	-106
Balance at End of Period	$5,087	$4,708	$30,731

Note_10_Net_Income_Loss_Per_Sh2

Note 10 - Net Income (Loss) Per Share (Details) - Calculation of Earnings Per Share (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Calculation of Earnings Per Share [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Net income (in Dollars)	$6,822	$4,824	$4,552	$4,731	$23,899	$4,993	$4,820	$3,499	$20,929	$37,211	$1,880
Numerator:	'	'	'	'	'	'	'	'	'	'	'
Basic weighted-average shares outstanding	'	'	'	'	'	'	'	'	29,826	28,700	28,086
Effect of dilutive options and restricted stock	'	'	'	'	'	'	'	'	1,567	1,109	345
Diluted weighted-average shares outstanding	'	'	'	'	'	'	'	'	31,393	29,809	28,431
Net income per share - Basic (in Dollars per share)	$0.23	$0.16	$0.15	$0.16	$0.82	$0.17	$0.17	$0.12	$0.70	$1.30	$0.07
Net income per share - Diluted (in Dollars per share)	$0.21	$0.15	$0.15	$0.15	$0.78	$0.17	$0.16	$0.12	$0.67	$1.25	$0.07

Note_10_Net_Income_Loss_Per_Sh3

Note 10 - Net Income (Loss) Per Share (Details) - Antidilutive Securities	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Antidilutive Securities	60	1,295
Equity Option [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Antidilutive Securities	49	1,275
Restricted Stock [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Antidilutive Securities	4	20
Employee Stock Purchase Plan [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Antidilutive Securities	7	'

Note_11_Customer_and_Geographi2

Note 11 - Customer and Geographic Information (Details)	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Number of Operating Segments	1

Note_11_Customer_and_Geographi3

Note 11 - Customer and Geographic Information (Details) - Revenue Percentage by Major Customers (Customer Concentration Risk [Member], Sales Revenue, Net [Member])	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Note 11 - Customer and Geographic Information (Details) - Revenue Percentage by Major Customers [Line Items]	'	'	'
Revenue Percentage by Major Customers	74.00%	73.00%	'
Customer A [Member]	'	'	'
Note 11 - Customer and Geographic Information (Details) - Revenue Percentage by Major Customers [Line Items]	'	'	'
Revenue Percentage by Major Customers	33.00%	40.00%	24.00%
Customer B [Member]	'	'	'
Note 11 - Customer and Geographic Information (Details) - Revenue Percentage by Major Customers [Line Items]	'	'	'
Revenue Percentage by Major Customers	24.00%	13.00%	15.00%
Customer C [Member]	'	'	'
Note 11 - Customer and Geographic Information (Details) - Revenue Percentage by Major Customers [Line Items]	'	'	'
Revenue Percentage by Major Customers	17.00%	20.00%	19.00%

Note_11_Customer_and_Geographi4

Note 11 - Customer and Geographic Information (Details) - Receivables Percentage by Major Customers (Customer Concentration Risk [Member], Accounts Receivable [Member])	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Note 11 - Customer and Geographic Information (Details) - Receivables Percentage by Major Customers [Line Items]	'	'
Accounts Receivable Percentage by Major Customers	76.00%	71.00%
Customer A [Member]	'	'
Note 11 - Customer and Geographic Information (Details) - Receivables Percentage by Major Customers [Line Items]	'	'
Accounts Receivable Percentage by Major Customers	36.00%	42.00%
Customer B [Member]	'	'
Note 11 - Customer and Geographic Information (Details) - Receivables Percentage by Major Customers [Line Items]	'	'
Accounts Receivable Percentage by Major Customers	23.00%	11.00%
Customer C [Member]	'	'
Note 11 - Customer and Geographic Information (Details) - Receivables Percentage by Major Customers [Line Items]	'	'
Accounts Receivable Percentage by Major Customers	17.00%	18.00%

Note_11_Customer_and_Geographi5

Note 11 - Customer and Geographic Information (Details) - Revenue by Geographical Areas (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Note 11 - Customer and Geographic Information (Details) - Revenue by Geographical Areas [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenue by geographical areas (in Dollars)	$27,078	$25,489	$24,776	$24,110	$23,815	$22,551	$22,531	$20,643	$101,453	$89,540	$66,712
Geographic Concentration Risk [Member] | North America [Member] | Sales Revenue, Net [Member]	'	'	'	'	'	'	'	'	'	'	'
Note 11 - Customer and Geographic Information (Details) - Revenue by Geographical Areas [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenue percentage by geographical areas	'	'	'	'	'	'	'	'	38.00%	40.00%	32.00%
Geographic Concentration Risk [Member] | GERMANY | Sales Revenue, Net [Member]	'	'	'	'	'	'	'	'	'	'	'
Note 11 - Customer and Geographic Information (Details) - Revenue by Geographical Areas [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenue percentage by geographical areas	'	'	'	'	'	'	'	'	22.00%	29.00%	18.00%
Geographic Concentration Risk [Member] | KOREA, REPUBLIC OF | Sales Revenue, Net [Member]	'	'	'	'	'	'	'	'	'	'	'
Note 11 - Customer and Geographic Information (Details) - Revenue by Geographical Areas [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenue percentage by geographical areas	'	'	'	'	'	'	'	'	21.00%	10.00%	17.00%
Geographic Concentration Risk [Member] | JAPAN | Sales Revenue, Net [Member]	'	'	'	'	'	'	'	'	'	'	'
Note 11 - Customer and Geographic Information (Details) - Revenue by Geographical Areas [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenue percentage by geographical areas	'	'	'	'	'	'	'	'	8.00%	10.00%	13.00%
Geographic Concentration Risk [Member] | Rest of Asia [Member] | Sales Revenue, Net [Member]	'	'	'	'	'	'	'	'	'	'	'
Note 11 - Customer and Geographic Information (Details) - Revenue by Geographical Areas [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenue percentage by geographical areas	'	'	'	'	'	'	'	'	7.00%	7.00%	11.00%
Geographic Concentration Risk [Member] | Rest of Europe [Member] | Sales Revenue, Net [Member]	'	'	'	'	'	'	'	'	'	'	'
Note 11 - Customer and Geographic Information (Details) - Revenue by Geographical Areas [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenue percentage by geographical areas	'	'	'	'	'	'	'	'	4.00%	4.00%	9.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member]	'	'	'	'	'	'	'	'	'	'	'
Note 11 - Customer and Geographic Information (Details) - Revenue by Geographical Areas [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenue percentage by geographical areas	'	'	'	'	'	'	'	'	100.00%	100.00%	100.00%
North America [Member]	'	'	'	'	'	'	'	'	'	'	'
Note 11 - Customer and Geographic Information (Details) - Revenue by Geographical Areas [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenue by geographical areas (in Dollars)	'	'	'	'	'	'	'	'	39,058	35,533	21,391
GERMANY	'	'	'	'	'	'	'	'	'	'	'
Note 11 - Customer and Geographic Information (Details) - Revenue by Geographical Areas [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenue by geographical areas (in Dollars)	'	'	'	'	'	'	'	'	22,431	25,928	12,039
KOREA, REPUBLIC OF	'	'	'	'	'	'	'	'	'	'	'
Note 11 - Customer and Geographic Information (Details) - Revenue by Geographical Areas [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenue by geographical areas (in Dollars)	'	'	'	'	'	'	'	'	20,953	9,160	11,407
JAPAN	'	'	'	'	'	'	'	'	'	'	'
Note 11 - Customer and Geographic Information (Details) - Revenue by Geographical Areas [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenue by geographical areas (in Dollars)	'	'	'	'	'	'	'	'	8,340	8,514	8,354
Rest of Asia [Member]	'	'	'	'	'	'	'	'	'	'	'
Note 11 - Customer and Geographic Information (Details) - Revenue by Geographical Areas [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenue by geographical areas (in Dollars)	'	'	'	'	'	'	'	'	6,920	6,302	7,601
Rest of Europe [Member]	'	'	'	'	'	'	'	'	'	'	'
Note 11 - Customer and Geographic Information (Details) - Revenue by Geographical Areas [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenue by geographical areas (in Dollars)	'	'	'	'	'	'	'	'	$3,751	$4,103	$5,920

Note_11_Customer_and_Geographi6

Note 11 - Customer and Geographic Information (Details) - Long-lived Assets, by Geographical Areas (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Note 11 - Customer and Geographic Information (Details) - Long-lived Assets, by Geographical Areas [Line Items]	'	'
Long-lived assets net, by geographical areas	$7,064	$3,898
North America [Member]	'	'
Note 11 - Customer and Geographic Information (Details) - Long-lived Assets, by Geographical Areas [Line Items]	'	'
Long-lived assets net, by geographical areas	6,578	3,527
Asia [Member]	'	'
Note 11 - Customer and Geographic Information (Details) - Long-lived Assets, by Geographical Areas [Line Items]	'	'
Long-lived assets net, by geographical areas	364	295
Europe [Member]	'	'
Note 11 - Customer and Geographic Information (Details) - Long-lived Assets, by Geographical Areas [Line Items]	'	'
Long-lived assets net, by geographical areas	$122	$76

Note_12_Financial_Instruments_1

Note 12 - Financial Instruments (Details) (Foreign Exchange Contract [Member], USD $)	12 Months Ended
	Dec. 31, 2013
Foreign Exchange Contract [Member]	'
Note 12 - Financial Instruments (Details) [Line Items]	'
Derivative, Gain on Derivative	$100,000
Derivative Asset, Notional Amount	7,600,000
Foreign Currency Derivative Assets at Fair Value	$0

Note_12_Financial_Instruments_2

Note 12 - Financial Instruments (Details) - Fair Value, Assets Measured on Recurring Basis (Money Market Mutual Funds [Member], USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Note 12 - Financial Instruments (Details) - Fair Value, Assets Measured on Recurring Basis [Line Items]	'	'
Assets at fair value	$26,353	$26,341
Fair Value, Inputs, Level 1 [Member]	'	'
Note 12 - Financial Instruments (Details) - Fair Value, Assets Measured on Recurring Basis [Line Items]	'	'
Assets at fair value	$26,353	$26,341

Note_13_Employee_Benefit_Plan_

Note 13 - Employee Benefit Plan (Details)	12 Months Ended
	Dec. 31, 2013
Disclosure Text Block Supplement [Abstract]	'
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	15.00%

Note_14_Selected_Quarterly_Fin2

Note 14 - Selected Quarterly Financial Data (Unaudited) (Details) - Selected Quarterly Financial Data (Unaudited) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Selected Quarterly Financial Data (Unaudited) [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	$27,078	$25,489	$24,776	$24,110	$23,815	$22,551	$22,531	$20,643	$101,453	$89,540	$66,712
Gross profit	17,513	14,982	15,035	14,453	14,409	13,094	13,625	11,915	61,983	53,043	36,670
Net income	$6,822	$4,824	$4,552	$4,731	$23,899	$4,993	$4,820	$3,499	$20,929	$37,211	$1,880
Basic (in Dollars per share)	$0.23	$0.16	$0.15	$0.16	$0.82	$0.17	$0.17	$0.12	$0.70	$1.30	$0.07
Diluted (in Dollars per share)	$0.21	$0.15	$0.15	$0.15	$0.78	$0.17	$0.16	$0.12	$0.67	$1.25	$0.07