PDF Solutions (PDFS) 10-Q 9 Aug 18 2018 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Aug. 01, 2018
Document Information [Line Items]
Entity Registrant Name	PDF SOLUTIONS INC
Entity Central Index Key	1,120,914
Trading Symbol	pdfs
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Common Stock, Shares Outstanding (in shares)		32,140,816
Document Type	10-Q
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
Amendment Flag	false

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 100,916	$ 101,267
Accounts receivable, net of allowance of $333 and $374, respectively	53,919	57,564
Prepaid expenses and other current assets	8,660	5,069
Total current assets	163,495	163,900
Property and equipment, net	28,095	25,386
Goodwill	1,923	1,923
Intangible assets, net	5,569	6,074
Deferred tax assets	17,747	16,348
Other non-current assets	8,943	10,545
Total assets	225,772	224,176
Current liabilities:
Accounts payable	2,495	2,536
Accrued compensation and related benefits	5,608	6,493
Accrued and other current liabilities	2,330	2,627
Deferred revenues – current portion	9,369	7,981
Total current liabilities	19,802	19,637
Long-term income taxes payable	4,652	3,902
Other non-current liabilities	994	2,269
Total liabilities	25,448	25,808
Commitments and contingencies (Note 9)
Stockholders’ equity:
Preferred stock, $0.00015 par value, 5,000 shares authorized, no shares issued and outstanding	0	0
Common stock, $0.00015 par value, 70,000 shares authorized: shares issued 40,298 and 39,799, respectively; shares outstanding 32,075 and 32,112, respectively	5	5
Additional paid-in-capital	304,948	297,950
Treasury stock at cost, 8,224 and 7,688 shares, respectively	(78,422)	(71,793)
Accumulated deficit	(25,256)	(27,089)
Accumulated other comprehensive loss	(951)	(705)
Total stockholders’ equity	200,324	198,368
Total liabilities and stockholders’ equity	$ 225,772	$ 224,176

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) shares in Thousands, $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accounts receivable, allowance	$ 333	$ 374
Preferred stock, par value (in dollars per share)	$ 0.00015	$ 0.00015
Preferred stock, shares authorized (in shares)	5,000	5,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.00015	$ 0.00015
Common stock, shares authorized (in shares)	70,000	70,000
Common stock, shares issued (in shares)	40,298	39,799
Common stock, shares outstanding (in shares)	32,075	32,112
Treasury stock, shares (in shares)	8,224	7,688

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues:
Revenues	$ 21,119	$ 24,289	$ 45,856	$ 48,578
Costs of Design-to-silicon-yield solutions
Gross profit	10,202	12,910	23,457	25,768
Operating expenses:
Research and development	7,100	7,276	14,345	14,557
Selling, general and administrative	5,919	6,195	12,294	12,095
Amortization of other acquired intangible assets	108	92	217	184
Total operating expenses	13,127	13,563	26,856	26,836
Loss from operations	(2,925)	(653)	(3,399)	(1,068)
Interest and other income (expense), net	390	27	59	(202)
Loss before income taxes	(2,535)	(626)	(3,340)	(1,270)
Income tax benefits	(439)	(815)	(820)	(1,976)
Net income (loss)	$ (2,096)	$ 189	$ (2,520)	$ 706
Net income (loss) per share:
Basic (in dollars per share)	$ (0.07)	$ 0.01	$ (0.08)	$ 0.02
Diluted (in dollars per share)	$ (0.07)	$ 0.01	$ (0.08)	$ 0.02
Weighted average common shares:
Basic (in shares)	31,962	32,111	32,065	32,051
Diluted (in shares)	31,962	33,388	32,065	33,491
Net income (loss)	$ (2,096)	$ 189	$ (2,520)	$ 706
Other comprehensive income:
Foreign currency translation adjustments, net of tax	(771)	435	(246)	708
Comprehensive income (loss)	(2,867)	624	(2,766)	1,414
License and Service [Member]
Revenues:
Revenues	15,266	16,500	33,456	36,198
Costs of Design-to-silicon-yield solutions
Direct costs of Design-to-silicon-yield solutions	10,774	11,283	22,112	22,618
Amortization of acquired technology	143	96	287	192
Total cost of Design-to-silicon-yield solutions	10,917	11,379	22,399	22,810
Gainshare Performance Incentives [Member]
Revenues:
Revenues	$ 5,853	$ 7,789	$ 12,400	$ 12,380

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating activities:
Net income (loss)	$ (2,520)	$ 706
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,531	2,286
Stock-based compensation expense	5,557	5,788
Amortization of acquired intangible assets	505	376
Deferred taxes	(1,701)	(193)
Loss on disposal of property and equipment	3	5
Provision for (reversal of) allowance for doubtful accounts	(42)	124
Unrealized loss (gain) on foreign currency forward contract	47	33
Changes in operating assets and liabilities:
Accounts receivable, net of allowance	4,479	(5,996)
Prepaid expenses and other current assets	(1,204)	(3,435)
Accounts payable	(992)	851
Accrued compensation and related benefits	(818)	(223)
Accrued and other liabilities	(475)	(745)
Deferred revenues	2,745	726
Billings in excess of recognized revenues	7	301
Other non-current assets	1,597	377
Net cash provided by operating activities	9,719	981
Investing activities:
Purchases of property and equipment	(4,810)	(4,964)
Net cash used in investing activities	(4,810)	(4,964)
Financing activities:
Proceeds from exercise of stock options	416	1,808
Repurchases of common stock	(5,248)	(4,770)
Proceeds from employee stock purchase plan	1,007	910
Payments for taxes related to net share settlement of equity awards	(1,376)	(1,879)
Net cash (used in) provided by financing activities	(5,201)	(3,931)
Effect of exchange rate changes on cash and cash equivalents	(59)	134
Net change in cash and cash equivalents	(351)	(7,780)
Cash and cash equivalents, beginning of period	101,267	116,787
Cash and cash equivalents, end of period	100,916	109,007
Supplemental disclosure of cash flow information:
Taxes	1,104	1,339
Property and equipment received and accrued in accounts payable and accrued and other liabilities	$ 1,673	$ 1,726

Note 1 - Basis of Presentation

Note 1 - Basis of Presentation and Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2018
Notes to Financial Statements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	1. Basis of Presentation The interim unaudited condensed consolidated financial statements included herein have been prepared by PDF Solutions, Inc. (the “Company”) pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”), including the instructions to the Quarterly Report on Form 10 10 X. not may 10 December 31, 2017. The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries after the elimination of all intercompany balances and transactions. The condensed consolidated balance sheet at December 31, 2017, not 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 significant estimates and judgments made in recognizing revenue, accounting for goodwill and intangible assets, stock-based compensation expense and accounting for income taxes. Actual results could differ from those estimates. For a discussion of significant estimates and judgments made in recognizing revenue under the new revenue standard, see Note 2. Recent Accounting Pronouncements – Recently Adopted Accounting Standards In May 2014, No. 2014 09, 606 605 606, five first first 2018. 2. In August 2016, No. 2016 15, 230 December 15, 2017, January 1, 2018 not In November 2016, No. 2016 18, 230 December 15, 2017, January 1, 2018, not In January 2017, No. 2017 01, December 15, 2017. January 1, 2018, not In May 2017, No. 2017 09, 718 718. December 15, 2017. January 1, 2018, not Accounting Standards Not In February 2016, No. 2016 02, 842 December 15, 2018, In January 2017, No. 2017 04, 350 2 December 15, 2019, not In February 2018, No. 2018 02, 220 December 2017. December 15, 2018 not In March 2018, 2018 05, 740 No. 118". December 22, 2017 118 118 740 not one 5.

Note 2 - Revenue Recognition

Note 2 - Revenue Recognition	6 Months Ended
	Jun. 30, 2018
Notes to Financial Statements
Revenue from Contract with Customer [Text Block]	2. On January 1, 2018, 606, not January 1, 2018. 2018 606 not The Company also considered the impact of subtopic ASC 340 40. 606, 340 40, The most significant impacts of the adoption of Topic 606 ● At the adoption date, the Company recorded a net decrease of $4.4 606 605, January 1, 2018 $0.8 $1.9 $2.5 $0.5 ● For fiscal 2018, 606 605. 605 2018 first second 2018 not The adoption of Topic 606 may 605 606 605. In addition, under the Company’s previous accounting practices, revenue was recognized from Gainshare performance incentive agreements in the period of receipt of related Gainshare acknowledgement reports, generally one 606, not Under Topic 605, 606, The following table summarizes the effects of adopting Topic 606 June 30, 2018: As reported under Topic 606 Adjustments Balances under Topic 605 (In thousands) Accounts receivable, net of allowance $ 53,919 $ 621 $ 54,540 Prepaid expenses and other current assets 8,660 (3,546 ) 5,114 Deferred tax assets 17,747 316 18,063 Other non-current assets 8,943 (78 ) 8,865 Deferred revenues – current portion 9,369 1,858 11,227 Long-term income taxes payable 4,652 (1,032 ) 3,620 Other non-current liabilities 994 785 1,779 Accumulated deficit (25,256 ) (4,298 ) (29,554 ) The impact of adopting Topic 606 three six June 30, 2018 not no The Company’s net cash provided by operating activities for the three six June 30, 2018 not 606. 606 six June 30, 2018: As reported under Topic 606 Adjustments Balances under Topic 605 (In thousands) Net income $ (2,520 ) $ 55 $ (2,465 ) Changes in operating assets and liabilities: Accounts receivable, net of allowance 4,479 (1,413 ) 3,066 Prepaid expenses and other current assets (1,204 ) 1,154 (50 ) Other non-current assets 1,597 79 1,676 Deferred revenue 2,745 125 2,870 The Company derives revenue from two Revenue is recognized when control of products or services is transferred to customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those promised products or services. The Company determines revenue recognition through the following five ● Identification of the contract, or contracts, with a customer ● Identification of the performance obligations in the contract ● Determination of the transaction price ● Allocation of the transaction price to the performance obligations in the contract ● Recognition of revenue when, or as, performance obligations are satisfied The Company accounts for a contract when it has approval and commitment from both parties, the rights of the parties are identified, payment terms are identified, the contract has commercial substance and collectability of consideration is probable. The Company enters into contracts that can include various combinations of licenses, products and services, some of which are distinct and are accounted for as separate performance obligations. For contracts with multiple performance obligations, the Company allocates the transaction price of the contract to each performance obligation, generally on a relative basis using its standalone selling price. Nature of Products and Services Design-to-silicon-yield solutions — 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. Revenue under project–based contracts for solution implementation services is recognized as services are performed using a percentage of completion method based on costs or labor-hours inputs, whichever is the most appropriate measure of the progress towards completion of the contract. Due to the nature of the work performed in these arrangements, the estimation of costs or hours at completion is complex, subject to many variables and requires significant judgment. Key factors reviewed by the Company to estimate costs to complete each contract are future labor and product costs and expected productivity efficiencies. If circumstances arise that change the original estimates of revenues, costs, or extent of progress toward completion, revisions to the estimates are made. These revisions may On occasion, the Company includes its products as a component of its fixed-price service contracts. In such instances, the Company determines whether the services performed and products included, are distinct. In most cases, the arrangement is a single performance obligation and therefore follows the pattern of transfer as the service is provided. The Company applies a measure of progress (typically hours-to-hours or cost-to-cost) to any fixed consideration. As a result, revenue is generally recognized over the period the services are performed using percentage of completion method. This results in revenue recognition that corresponds with the value to the client of the services transferred to date relative to the remaining services promised. The Company also licenses our Design-for-Inspection ("DFI") system as a separate component of fixed-price service contracts. The Company allocates revenue to all deliverables based on their standalone selling prices, or SSP. In such instances, the Company applies judgment to estimate the range of SSPs for each performance obligation. The Company licenses some of its software products separately from solution implementations, primarily its Exensio big data platform and related products. The majority of these products are delivered as on premise software licenses, while others can be delivered entirely or partially through Software-as-a-Service (SaaS) or cloud delivery models. Revenue from perpetual ( one Gainshare Performance Incentives — When the Company enters into a contract to provide yield improvement services, the contract usually includes two 1 2 The following table summarizes the effects of adopting Topic 606 three June 30, 2018: As reported under Topic 606 Adjustments Balances under Topic 605 (In thousands) Design-to-silicon-yield solutions $ 15,266 $ 12 $ 15,278 Total revenue 21,119 12 21,131 Gross margin 10,202 12 10,214 Selling, general and administrative 5,919 (73 ) 5,846 Total operating expenses 13,127 (73 ) 13,054 Income (loss) from operations (2,925 ) 85 (2,840 ) Income (loss) before taxes (2,535 ) 85 (2,450 ) Net income (loss) (2,096 ) 85 (2,011 ) The following table summarizes the effects of adopting Topic 606 six June 30, 2018: As reported under Topic 606 Adjustments Balances under Topic 605 (In thousands) Design-to-silicon-yield solutions $ 33,456 $ (18 ) $ 33,438 Total revenue 45,856 (18 ) 45,838 Gross margin 23,457 (18 ) 23,439 Selling, general and administrative 12,294 (73 ) 12,221 Total operating expenses 26,856 (73 ) 26,783 Income (loss) from operations (3,399 ) 55 (3,344 ) Income (loss) before taxes (3,340 ) 55 (3,285 ) Net income (loss) (2,520 ) 55 (2,465 ) Disaggregation of revenue In accordance with ASC 606 10 50, The following table shows the revenues from contracts with customers by the nature of transactions for the three six June 30, 2018: Three Months Ended Six Months Ended June 30, 2018 June 30, 2018 Product and licenses $ 6,828 $ 14,315 Support and Services 14,200 31,190 Other 90 351 Total $ 21,119 $ 45,856 Product and licenses include a portion of time-based software which is recognized in the period, perpetual software and Gainshare performance incentives. The remaining portions of revenue from these contracts correspond to services or other types of performance obligations reported as either services revenue or other revenue. Under Topic 606, 68% 32% three six June 30, 2018, 57% 58% three six June 30, 2018, 62% 57% three six June 30, 2017, 7. Significant Judgments More judgments and estimates are required under Topic 606 605. 606 may may In services arrangements, the Company typically satisfies the performance obligation and recognizes revenue over time. In Design-to-silicon-yield service arrangements, the performance obligation is satisfied over time either because the client controls the asset as it is created (e.g., when the asset is built at the customer site) or because the Company’s performance does not For revenue under project–based contracts for fixed-price solution implementation services, revenue is recognized as services are performed using a percentage-of-completion method based on costs or labor-hours input method, whichever is the most appropriate measure of the progress towards completion of the contract. Due to the nature of the work performed in these arrangements, the estimation of percentage of completion method is complex, subject to many variables and requires significant judgment. Key factors reviewed by the Company to estimate costs to complete each contract are future labor and product costs and expected productivity efficiencies. If circumstances arise that change the original estimates of revenues, costs, or extent of progress toward completion, revisions to the estimates are made. These revisions may The Company’s contracts with customers often include promises to transfer products, licenses and services, including professional services, technical support services, and rights to unspecified updates to a customer. Determining whether products, licenses and services are distinct performance obligations that should be accounted for separately, or not not not may one may The Company is required to record Gainshare royalty revenue in the same period in which the usage occurs. Because the Company generally does not Contract Balances The Company performs its obligation under a contract with a customer by transferring products or services in exchange for consideration from the customer. The timing of the Company’s performance often differs from the timing of the customer’s payment, which results in the recognition of a receivable, a contract asset or a contract liability. The Company classifies the right to consideration in exchange for products or services transferred to a client as either a receivable or a contract asset. A receivable is a right to consideration that is unconditional as compared to a contract asset which is a right to consideration that is conditional upon factors other than the passage of time. The majority of the Company’s contract assets represent unbilled amounts related to fixed-price solution implementation service contracts when the costs or labor-hours input method of revenue recognition is utilized and revenue recognized exceeds the amount billed to the client, and the right to consideration is subject to milestone completion or client acceptance. The contract assets are generally classified as current and are recorded on a net basis with deferred revenue (i.e., contract liabilities) at the contract level. The contract assets is included in prepaid expenses and other in the condensed consolidated balance sheets. At June 30, 2018 January 1, 2018, $3.2 $1.9 twelve $0.5 $0.9 June 30, 2018 January 1, 2018. During the three six June 30, 2018, $5.0 $7.6 606, 2018. At June 30, 2018, $45.3 2 5 not not one Payment terms and conditions vary by contract type, although terms generally include a requirement of payment within 30 90 not not The amount of revenue recognized in the three six June 30, 2018 $0.2 $0.3 Costs to obtain or fulfill a contract The Company capitalizes the incremental costs to obtain or fulfill a contract with a customer, including direct sales commissions and related fees, when it expects to recover those costs. As a result, these costs will need to be capitalized and amortized over an appropriate period, which may not not June 30, 2018 $0.5 $0.1 $0.2 three six June 30, 2018, no no no $0.4 $0.6 June 30, 2018 December 31, 2017,

Note 3 - Balance Sheet Componen

Note 3 - Balance Sheet Components	6 Months Ended
	Jun. 30, 2018
Notes to Financial Statements
Supplemental Balance Sheet Disclosures [Text Block]	3. Accounts receivable include amounts that are unbilled at the end of the period that are expected to be billed and collected within a 12 $23.2 $22.2 June 30, 2018, December 31, 2017, not 12 $7.3 $8.6 June 30, 2018 December 31, 2017, Property and equipment, net consists of (in thousands): June 30, 2018 December 31, 2017 Property and equipment, net: Computer equipment $ 10,568 $ 10,729 Software 4,120 3,348 Furniture, fixtures and equipment 4,119 3,676 Leasehold improvements 2,002 1,980 Test equipment 14,659 13,796 Construction-in-progress 14,992 12,527 50,460 46,056 Less: accumulated depreciation (22,365 ) (20,670 ) Total $ 28,095 $ 25,386 Test equipment includes DFI assets at customer sites that are contributing to DFI solution revenues. The construction-in-progress balance as of June 30, 2018 December 31, 2017 $1.3 $1.2 three June 30, 2018 2017, $2.5 $2.3 six June 30, 2018 2017, As of both June 30, 2018, December 31, 2017, $1.9 Intangible assets balance was $5.6 $6.1 June 30, 2018, December 31, 2017, June 30, 2018 December 31, 2017 June 30, 2018 December 31, 2017 Amortization Period (Years) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Acquired identifiable intangibles: Customer relationships 1 - 9 $ 6,740 $ (4,329 ) $ 2,411 $ 6,740 $ (4,145 ) $ 2,595 Developed technology 4 - 6 15,820 (13,117 ) 2,703 15,820 (12,829 ) 2,991 Tradename 2 - 4 790 (635 ) 155 790 (622 ) 168 Backlog 1 100 (100 ) - 100 (100 ) - Patent 7 - 10 1,800 (1,500 ) 300 1,800 (1,480 ) 320 Other acquired intangibles 4 255 (255 ) - 255 (255 ) - Total $ 25,505 $ (19,936 ) $ 5,569 $ 25,505 $ (19,431 ) $ 6,074 The weighted average amortization period for acquired identifiable intangible assets was 6.31 June 30, 2018. three six June 30, 2018, $0.3 $0.5 three six June 30, 2017, $0.2 $0.4 Year ending December 31, Amount 2018 (remaining six months) $ 505 2019 1,009 2020 1,009 2021 833 2022 626 2023 and thereafter 1,587 Total future amortization expense $ 5,569 Intangible assets are amortized over their useful lives unless these lives are determined to be indefinite. Intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset or asset group may not three six June 30, 2018, no

Note 4 - Stockholders' Equity

Note 4 - Stockholders' Equity	6 Months Ended
	Jun. 30, 2018
Notes to Financial Statements
Shareholders' Equity and Share-based Payments [Text Block]	4. 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 . Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Cost of Design-to-silicon yield-solutions $ 968 $ 1,069 $ 1,981 $ 2,261 Research and development 845 848 1,724 1,682 Selling, general and administrative 889 987 1,852 1,845 Stock-based compensation expenses $ 2,702 $ 2,904 $ 5,557 $ 5,788 On June 30, 2018, Stock Plans — November 16, 2011, 2011 2017 May 31, 2017, 2011 “2011 2011 may 7,800,000 3,500,000 2001 2001 "2001 November 16, 2011. 1.33 no ten four In 2001, 2001 2003, 2001 2001 2011. 2001 ten four no may 2001 2001 As of June 30, 2018, 9.6 2011 4.1 2011 0.5 2001 2011 June 30, 2018. June 30, 2018, no 2011, 2001 The Company estimated the fair value of share-based awards granted under the 2011 Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Expected life (in years) - 4.41 4.43 4.41 Volatility - 41.63 % 42.22 % 41.53 % Risk-free interest rate - 1.67 % 2.52 % 1.69 % Expected dividend - - - - Weighted average fair value per share of options granted during the period $ - $ 5.98 $ 4.28 $ 6.16 No three June 30, 2018. Stock option activity under the Company’s Stock Plans during the six June 30, 2018, Number of Options (in thousands) Weighted Average Exercise Price per Share Weighted Average Remaining Contractual Term (years) Aggregate Intrinsic Value (in thousands) Outstanding, January 1, 2018 1,045 $ 9.65 Granted (weighted average fair value of $4.28 per share) 10 $ 11.26 Exercised (59 ) $ 7.069 Canceled (6 ) $ 14.02 Expired (4 ) $ 16.22 Outstanding, June 30, 2018 986 $ 9.80 4.51 $ 3,404 Vested and expected to vest, June 30, 2018 977 $ 9.71 4.44 $ 3,403 Exercisable, June 30, 2018 808 $ 8.50 3.56 $ 3,380 The aggregate intrinsic value in the table above represents the total intrinsic value based on the Company’s closing stock price of $11.98 June 30, 2018. six June 30, 2018, $0.3 As of June 30, 2018, $0.9 3.0 six June 30, 2018, $0.2 Restricted stock unit activity during the six June 30, 2018, Shares (in thousands) Weighted Average Grant Date Fair Value Per Share Outstanding, January 1, 2018 1,617 $ 15.66 Granted 10 $ 11.26 Vested (332 ) $ 16.19 Forfeited (84 ) $ 15.53 Outstanding, June 30, 2018 1,211 $ 15.49 As of June 30, 2018, $15.3 2.3 not Employee Stock Purchase Plan July 2001, ten 10% 85% twenty-four four six January 1 2002, 1 675,000 2 2% 3 May 18, 2010, May 17, 2020. The Company estimated the fair value of purchase rights granted under the Purchase Plan during the period using the Black-Scholes-Merton option-pricing model with the following weighted average assumptions, resulting in the following weighted average fair values: Six Months Ended June 30, 2018 2017 Expected life (in years) 1.25 1.25 Volatility 37.23 % 33.32 % Risk-free interest rate 1.93 % 0.93 % Expected dividend — — Weighted average fair value per share of options granted during the period $ 4.32 $ 6.78 During the three June 30, 2018 2017, no six June 30, 2018 2017, 108,000 100,000 $9.29 $9.13 June 30, 2018, $1.3 1.58 June 30, 2018, 4.2 Stock Repurchase Program May 29, 2018, 2016 2018 $25.0 two three six June 30, 2018, 98,800 437,007 2016 June 30, 2018, 1,279,189 $14.59 2016 $18.7 2018 June 30,.2018, $25.0

Note 5 - Income Taxes

Note 5 - Income Taxes	6 Months Ended
	Jun. 30, 2018
Notes to Financial Statements
Income Tax Disclosure [Text Block]	5. Income tax benefit decreased $1.2 six June 30, 2018 $0.8 $2.0 six June 30, 2017. 23% 156% six June 30, 2018 2017, six June 30, 2018, 2017, 35% 21%. The Company’s total amount of unrecognized tax benefits, excluding interest and penalties, as of June 30, 2018, $13.0 $7.7 December 31, 2017, $12.9 $7.7 June 30, 2018, $2.9 $10.8 $5.3 The valuation allowance was approximately $9.5 $9.1 June 30, 2018, December 31, 2017, not not The Company is required to assess whether it is more-likely-than- not not not In December 2017, No. 118, 118 not one fourth 2017, no 2017 10 Effective January 1, 2018, 1 2 first 2018, 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 not

Note 6 - Net Income Per Share

Note 6 - Net Income Per Share	6 Months Ended
	Jun. 30, 2018
Notes to Financial Statements
Earnings Per Share [Text Block]	6. 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. The following is a reconciliation of the numerators and denominators used in computing basic and diluted net income per share (in thousands except per share amount): Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Numerator: Net income (loss) $ (2,096 ) $ 189 $ (2,520 ) $ 706 Denominator: Basic weighted-average common shares outstanding 31,962 32,111 32,065 32,051 Effect of dilutive options and restricted stock - 1,277 - 1,440 Diluted weighted average shares outstanding 31,962 33,388 32,065 33,491 Net income (loss) per share - Basic $ (0.07 ) $ 0.01 $ (0.08 ) $ 0.02 Net income (loss) per share - Diluted $ (0.07 ) $ 0.01 $ (0.08 ) $ 0.02 For the three six June 30, 2018, no The following table sets forth potential shares of common stock that are not Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Outstanding options - 102 - 79 Nonvested restricted stock units - 13 - 4 Employee Stock Purchase Plan - 27 - 29 Total - 142 - 112

Note 7 - Customer and Geographi

Note 7 - Customer and Geographic Information	6 Months Ended
	Jun. 30, 2018
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	7. 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 The Company had revenues from individual customers in excess of 10% Three Months Ended June 30, Six Months Ended June 30, Customer 2018 2017 2018 2017 A 40 % 36 % 39 % 42 % B 10 % 15 % * % 10 % The Company had gross accounts receivable from individual customers in excess of 10% Customer June 30, 2018 December 31, 2017 A 43 % 41 % B 18 % 15 % * represents less than 10% Revenues from customers by geographic area based on the location of the customers’ work sites are as follows (in thousands): Three Months Ended June 30, 2018 2017 Revenues Percentage of Revenues Revenues Percentage of Revenues United States $ 8,982 42 % $ 9,226 38 % China 4,360 21 4,753 20 Taiwan 1,038 5 3,643 15 Rest of the world 6,739 32 6,667 27 Total revenue $ 21,119 100 % $ 24,289 100 % Six Months Ended June 30, 2018 2017 Revenues Percentage of Revenues Revenues Percentage of Revenues United States $ 19,065 41 % $ 20,860 44 % China 9,542 21 6,440 13 Taiwan 3,173 7 7,480 15 Rest of the world 14,076 31 13,798 28 Total revenue $ 45,856 100 % $ 48,578 100 % Long-lived assets, net by geographic area are as follows (in thousands): June 30, 2018 December 31, 2017 United States $ 27,612 $ 24,883 Rest of the world 483 503 Total long-lived assets, net $ 28,095 $ 25,386

Note 8 - Fair Value Measurement

Note 8 - Fair Value Measurements	6 Months Ended
	Jun. 30, 2018
Notes to Financial Statements
Fair Value Disclosures [Text Block]	8. 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 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 Level 3 Inputs are derived from valuation techniques in which one The following table represents the Company’s assets measured at fair value on a recurring basis as of June 30, 2018, Assets Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Money market mutual funds $ 26,814 $ 26,814 $ — $ — The following table represents the Company’s assets measured at fair value on a recurring basis as of December 31, 2017, Assets Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Money market mutual funds $ 26,638 $ 26,638 $ — $ — 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 not not three June 30, 2018 2017, $0.6 $0.4 six June 30, 2018 2017, $0.4 $0.5 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 not June 30, 2018, one $8.1 $35,000 December 31, 2017, one $8.2 $12,000

Note 9 - Commitments and Contin

Note 9 - Commitments and Contingencies	6 Months Ended
	Jun. 30, 2018
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	9. 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 2028. $0.7 $0.6 three June 30, 2018 2017, $1.3 $1.1 six June 30, 2018 2017, Future minimum lease payments under noncancelable operating leases at June 30, 2018, Year ending December 31, Amount 2018 (remaining six months) $ 718 2019 1,307 2020 1,374 2021 1,291 2022 1,061 2023 and thereafter 4,264 Total future minimum lease payments $ 10,015 In April 2018, 20,800 ten September 1, 2018. $7.0 $0.4 $1.3 Indemnifications 90 third not Purchase obligations June 30, 2018, $13.7 12 Indemnification of Officers and Directors 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 may not Litigation June 30, 2018, not no no

Significant Accounting Policies

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	Basis of Presentation The interim unaudited condensed consolidated financial statements included herein have been prepared by PDF Solutions, Inc. (the “Company”) pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”), including the instructions to the Quarterly Report on Form 10 10 X. not may 10 December 31, 2017. The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries after the elimination of all intercompany balances and transactions. The condensed consolidated balance sheet at December 31, 2017, not
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 significant estimates and judgments made in recognizing revenue, accounting for goodwill and intangible assets, stock-based compensation expense and accounting for income taxes. Actual results could differ from those estimates. For a discussion of significant estimates and judgments made in recognizing revenue under the new revenue standard, see Note 2.
New Accounting Pronouncements, Policy [Policy Text Block]	Recent Accounting Pronouncements – Recently Adopted Accounting Standards In May 2014, No. 2014 09, 606 605 606, five first first 2018. 2. In August 2016, No. 2016 15, 230 December 15, 2017, January 1, 2018 not In November 2016, No. 2016 18, 230 December 15, 2017, January 1, 2018, not In January 2017, No. 2017 01, December 15, 2017. January 1, 2018, not In May 2017, No. 2017 09, 718 718. December 15, 2017. January 1, 2018, not Accounting Standards Not In February 2016, No. 2016 02, 842 December 15, 2018, In January 2017, No. 2017 04, 350 2 December 15, 2019, not In February 2018, No. 2018 02, 220 December 2017. December 15, 2018 not In March 2018, 2018 05, 740 No. 118". December 22, 2017 118 118 740 not one 5.

Note 2 - Revenue Recognition (T

Note 2 - Revenue Recognition (Tables)	6 Months Ended
	Jun. 30, 2018
Notes Tables
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]	As reported under Topic 606 Adjustments Balances under Topic 605 (In thousands) Accounts receivable, net of allowance $ 53,919 $ 621 $ 54,540 Prepaid expenses and other current assets 8,660 (3,546 ) 5,114 Deferred tax assets 17,747 316 18,063 Other non-current assets 8,943 (78 ) 8,865 Deferred revenues – current portion 9,369 1,858 11,227 Long-term income taxes payable 4,652 (1,032 ) 3,620 Other non-current liabilities 994 785 1,779 Accumulated deficit (25,256 ) (4,298 ) (29,554 ) As reported under Topic 606 Adjustments Balances under Topic 605 (In thousands) Net income $ (2,520 ) $ 55 $ (2,465 ) Changes in operating assets and liabilities: Accounts receivable, net of allowance 4,479 (1,413 ) 3,066 Prepaid expenses and other current assets (1,204 ) 1,154 (50 ) Other non-current assets 1,597 79 1,676 Deferred revenue 2,745 125 2,870 As reported under Topic 606 Adjustments Balances under Topic 605 (In thousands) Design-to-silicon-yield solutions $ 15,266 $ 12 $ 15,278 Total revenue 21,119 12 21,131 Gross margin 10,202 12 10,214 Selling, general and administrative 5,919 (73 ) 5,846 Total operating expenses 13,127 (73 ) 13,054 Income (loss) from operations (2,925 ) 85 (2,840 ) Income (loss) before taxes (2,535 ) 85 (2,450 ) Net income (loss) (2,096 ) 85 (2,011 ) As reported under Topic 606 Adjustments Balances under Topic 605 (In thousands) Design-to-silicon-yield solutions $ 33,456 $ (18 ) $ 33,438 Total revenue 45,856 (18 ) 45,838 Gross margin 23,457 (18 ) 23,439 Selling, general and administrative 12,294 (73 ) 12,221 Total operating expenses 26,856 (73 ) 26,783 Income (loss) from operations (3,399 ) 55 (3,344 ) Income (loss) before taxes (3,340 ) 55 (3,285 ) Net income (loss) (2,520 ) 55 (2,465 )
Disaggregation of Revenue [Table Text Block]	Three Months Ended Six Months Ended June 30, 2018 June 30, 2018 Product and licenses $ 6,828 $ 14,315 Support and Services 14,200 31,190 Other 90 351 Total $ 21,119 $ 45,856

Note 3 - Balance Sheet Compon17

Note 3 - Balance Sheet Components (Tables)	6 Months Ended
	Jun. 30, 2018
Notes Tables
Property, Plant and Equipment [Table Text Block]	June 30, 2018 December 31, 2017 Property and equipment, net: Computer equipment $ 10,568 $ 10,729 Software 4,120 3,348 Furniture, fixtures and equipment 4,119 3,676 Leasehold improvements 2,002 1,980 Test equipment 14,659 13,796 Construction-in-progress 14,992 12,527 50,460 46,056 Less: accumulated depreciation (22,365 ) (20,670 ) Total $ 28,095 $ 25,386
Schedule of Finite-Lived Intangible Assets [Table Text Block]	June 30, 2018 December 31, 2017 Amortization Period (Years) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Acquired identifiable intangibles: Customer relationships 1 - 9 $ 6,740 $ (4,329 ) $ 2,411 $ 6,740 $ (4,145 ) $ 2,595 Developed technology 4 - 6 15,820 (13,117 ) 2,703 15,820 (12,829 ) 2,991 Tradename 2 - 4 790 (635 ) 155 790 (622 ) 168 Backlog 1 100 (100 ) - 100 (100 ) - Patent 7 - 10 1,800 (1,500 ) 300 1,800 (1,480 ) 320 Other acquired intangibles 4 255 (255 ) - 255 (255 ) - Total $ 25,505 $ (19,936 ) $ 5,569 $ 25,505 $ (19,431 ) $ 6,074
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	Year ending December 31, Amount 2018 (remaining six months) $ 505 2019 1,009 2020 1,009 2021 833 2022 626 2023 and thereafter 1,587 Total future amortization expense $ 5,569

Note 4 - Stockholders' Equity (

Note 4 - Stockholders' Equity (Tables)	6 Months Ended
	Jun. 30, 2018
Notes Tables
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]	Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Cost of Design-to-silicon yield-solutions $ 968 $ 1,069 $ 1,981 $ 2,261 Research and development 845 848 1,724 1,682 Selling, general and administrative 889 987 1,852 1,845 Stock-based compensation expenses $ 2,702 $ 2,904 $ 5,557 $ 5,788
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Expected life (in years) - 4.41 4.43 4.41 Volatility - 41.63 % 42.22 % 41.53 % Risk-free interest rate - 1.67 % 2.52 % 1.69 % Expected dividend - - - - Weighted average fair value per share of options granted during the period $ - $ 5.98 $ 4.28 $ 6.16 Six Months Ended June 30, 2018 2017 Expected life (in years) 1.25 1.25 Volatility 37.23 % 33.32 % Risk-free interest rate 1.93 % 0.93 % Expected dividend — — Weighted average fair value per share of options granted during the period $ 4.32 $ 6.78
Share-based Compensation, Stock Options, Activity [Table Text Block]	Number of Options (in thousands) Weighted Average Exercise Price per Share Weighted Average Remaining Contractual Term (years) Aggregate Intrinsic Value (in thousands) Outstanding, January 1, 2018 1,045 $ 9.65 Granted (weighted average fair value of $4.28 per share) 10 $ 11.26 Exercised (59 ) $ 7.069 Canceled (6 ) $ 14.02 Expired (4 ) $ 16.22 Outstanding, June 30, 2018 986 $ 9.80 4.51 $ 3,404 Vested and expected to vest, June 30, 2018 977 $ 9.71 4.44 $ 3,403 Exercisable, June 30, 2018 808 $ 8.50 3.56 $ 3,380
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]	Shares (in thousands) Weighted Average Grant Date Fair Value Per Share Outstanding, January 1, 2018 1,617 $ 15.66 Granted 10 $ 11.26 Vested (332 ) $ 16.19 Forfeited (84 ) $ 15.53 Outstanding, June 30, 2018 1,211 $ 15.49

Note 6 - Net Income Per Share (

Note 6 - Net Income Per Share (Tables)	6 Months Ended
	Jun. 30, 2018
Notes Tables
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Numerator: Net income (loss) $ (2,096 ) $ 189 $ (2,520 ) $ 706 Denominator: Basic weighted-average common shares outstanding 31,962 32,111 32,065 32,051 Effect of dilutive options and restricted stock - 1,277 - 1,440 Diluted weighted average shares outstanding 31,962 33,388 32,065 33,491 Net income (loss) per share - Basic $ (0.07 ) $ 0.01 $ (0.08 ) $ 0.02 Net income (loss) per share - Diluted $ (0.07 ) $ 0.01 $ (0.08 ) $ 0.02
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]	Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Outstanding options - 102 - 79 Nonvested restricted stock units - 13 - 4 Employee Stock Purchase Plan - 27 - 29 Total - 142 - 112

Note 7 - Customer and Geograp20

Note 7 - Customer and Geographic Information (Tables)	6 Months Ended
	Jun. 30, 2018
Notes Tables
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]	Three Months Ended June 30, Six Months Ended June 30, Customer 2018 2017 2018 2017 A 40 % 36 % 39 % 42 % B 10 % 15 % * % 10 %
Receivables by Major Customers [Table Text Block]	Customer June 30, 2018 December 31, 2017 A 43 % 41 % B 18 % 15 %
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]	Three Months Ended June 30, 2018 2017 Revenues Percentage of Revenues Revenues Percentage of Revenues United States $ 8,982 42 % $ 9,226 38 % China 4,360 21 4,753 20 Taiwan 1,038 5 3,643 15 Rest of the world 6,739 32 6,667 27 Total revenue $ 21,119 100 % $ 24,289 100 % Six Months Ended June 30, 2018 2017 Revenues Percentage of Revenues Revenues Percentage of Revenues United States $ 19,065 41 % $ 20,860 44 % China 9,542 21 6,440 13 Taiwan 3,173 7 7,480 15 Rest of the world 14,076 31 13,798 28 Total revenue $ 45,856 100 % $ 48,578 100 %
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]	June 30, 2018 December 31, 2017 United States $ 27,612 $ 24,883 Rest of the world 483 503 Total long-lived assets, net $ 28,095 $ 25,386

Note 8 - Fair Value Measureme21

Note 8 - Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2018
Notes Tables
Fair Value, Assets Measured on Recurring Basis [Table Text Block]	Assets Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Money market mutual funds $ 26,814 $ 26,814 $ — $ — Assets Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Money market mutual funds $ 26,638 $ 26,638 $ — $ —

Note 9 - Commitments and Cont22

Note 9 - Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2018
Notes Tables
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	Year ending December 31, Amount 2018 (remaining six months) $ 718 2019 1,307 2020 1,374 2021 1,291 2022 1,061 2023 and thereafter 4,264 Total future minimum lease payments $ 10,015

Note 2 - Revenue Recognition (D

Note 2 - Revenue Recognition (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Retained Earnings (Accumulated Deficit), Ending Balance	$ (25,256)		$ (25,256)			$ (27,089)
Capitalized Contract Cost, Net, Total					$ 500
Contract with Customer, Liability, Noncurrent	500		500		900
Contract with Customer, Liability, Revenue Recognized	5,000		7,600
Revenue, Remaining Performance Obligation, Amount	45,300		45,300
Contract with Customer, Performance Obligation Satisfied in Previous Period	200		300
Capitalized Contract Cost, Amortization	100		200
Capitalized Contract Cost, Impairment Loss	0		0
Prepaid Expenses and Other Current Assets [Member]
Contract with Customer, Asset, Net, Current, Total	3,200		3,200		1,900
Prepaid Expenses and Other Current Assets and Other Non-current Assets [Member]
Deferred Costs, Total	$ 400		$ 400			$ 600
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Transferred over Time [Member]
Concentration Risk, Percentage	68.00%		32.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member]
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | Countries other than the United States [Member]
Concentration Risk, Percentage	57.00%	62.00%	58.00%	57.00%
Accounting Standards Update 2014-09 [Member]
Retained Earnings (Accumulated Deficit), Ending Balance					(4,400)
Accounts Receivable, Net, Total					800
Contract with Customer, Asset, Net, Total					1,900
Contract with Customer, Liability, Total					$ (2,500)

Note 2 - Revenue Recognition -

Note 2 - Revenue Recognition - Adoption of ASC 606 (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Accounts receivable, net of allowance	$ 53,919		$ 53,919			$ 57,564
Prepaid expenses and other current assets	8,660		8,660			5,069
Deferred tax assets	17,747		17,747			16,348
Other non-current assets	8,943		8,943			10,545
Deferred revenues – current portion	9,369		9,369			7,981
Long-term income taxes payable	4,652		4,652			3,902
Other non-current liabilities	994		994			2,269
Accumulated deficit	(25,256)		(25,256)			$ (27,089)
Net income (loss)	(2,096)	$ 189	(2,520)	$ 706
Accounts receivable, net of allowance			4,479	(5,996)
Prepaid expenses and other current assets			(1,204)	(3,435)
Other non-current assets			1,597	377
Deferred revenue			2,745
Revenues	21,119	24,289	45,856	48,578
Gross margin	10,202	12,910	23,457	25,768
Selling, general and administrative	5,919	6,195	12,294	12,095
Total operating expenses	13,127	13,563	26,856	26,836
Income (loss) from operations	(2,925)	(653)	(3,399)	(1,068)
Income (loss) before taxes	(2,535)	(626)	(3,340)	(1,270)
Accounting Standards Update 2014-09 [Member]
Accumulated deficit					$ (4,400)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Accounts receivable, net of allowance	621		621
Prepaid expenses and other current assets	(3,546)		(3,546)
Deferred tax assets	316		316
Other non-current assets	(78)		(78)
Deferred revenues – current portion	1,858		1,858
Long-term income taxes payable	(1,032)		(1,032)
Other non-current liabilities	785		785
Accumulated deficit	(4,298)		(4,298)
Net income (loss)	85		55
Accounts receivable, net of allowance			(1,413)
Prepaid expenses and other current assets			1,154
Other non-current assets			79
Deferred revenue			125
Revenues	12		(18)
Gross margin	12		(18)
Selling, general and administrative	(73)		(73)
Total operating expenses	(73)		(73)
Income (loss) from operations	85		55
Income (loss) before taxes	85		55
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Accounts receivable, net of allowance	54,540		54,540
Prepaid expenses and other current assets	5,114		5,114
Deferred tax assets	18,063		18,063
Other non-current assets	8,865		8,865
Deferred revenues – current portion	11,227		11,227
Long-term income taxes payable	3,620		3,620
Other non-current liabilities	1,779		1,779
Accumulated deficit	(29,554)		(29,554)
Net income (loss)	(2,011)		(2,465)
Accounts receivable, net of allowance			3,066
Prepaid expenses and other current assets			(50)
Other non-current assets			1,676
Deferred revenue			2,870
Revenues	21,131		45,838
Gross margin	10,214		23,439
Selling, general and administrative	5,846		12,221
Total operating expenses	13,054		26,783
Income (loss) from operations	(2,840)		(3,344)
Income (loss) before taxes	(2,450)		(3,285)
License and Service [Member]
Revenues	15,266	$ 16,500	33,456	$ 36,198
License and Service [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Revenues	12		(18)
License and Service [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenues	$ 15,278		$ 33,438

Note 2 - Revenue Recognition 25

Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues	$ 21,119	$ 24,289	$ 45,856	$ 48,578
License [Member]
Revenues	6,828		14,315
Service [Member]
Revenues	14,200		31,190
Product and Service, Other [Member]
Revenues	$ 90		$ 351

Note 3 - Balance Sheet Compon26

Note 3 - Balance Sheet Components (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Unbilled Receivables, Current	$ 23,200		$ 23,200		$ 22,200
Unbilled Receivables, Not Billable, Amount Expected to be Collected after Next Twelve Months	7,300		7,300		8,600
Depreciation, Depletion and Amortization, Nonproduction, Total	1,300	$ 1,200	2,500	$ 2,300
Goodwill, Ending Balance	1,923		1,923		1,923
Finite-Lived Intangible Assets, Net, Ending Balance	5,569		$ 5,569		$ 6,074
Finite-Lived Intangible Assets, Remaining Amortization Period			6 years 113 days
Amortization of Intangible Assets, Total	300	$ 200	$ 505	$ 376
Impairment of Intangible Assets, Finite-lived	$ 0		$ 0

Note 3 - Balance Sheet Compon27

Note 3 - Balance Sheet Components - Property and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Property and equipment, gross	$ 50,460	$ 46,056
Less: accumulated depreciation	(22,365)	(20,670)
Total	28,095	25,386
Computer Equipment [Member]
Property and equipment, gross	10,568	10,729
Software and Software Development Costs [Member]
Property and equipment, gross	4,120	3,348
Furniture and Fixtures [Member]
Property and equipment, gross	4,119	3,676
Leasehold Improvements [Member]
Property and equipment, gross	2,002	1,980
Test Equipment [Member]
Property and equipment, gross	14,659	13,796
Construction in Progress [Member]
Property and equipment, gross	$ 14,992	$ 12,527

Note 3 - Balance Sheet Compon28

Note 3 - Balance Sheet Components - Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Gross Carrying Amount	$ 25,505	$ 25,505
Accumulated Amortization	(19,936)	(19,431)
Intangible assets, net	5,569	6,074
Customer Relationships [Member]
Gross Carrying Amount	6,740	6,740
Accumulated Amortization	(4,329)	(4,145)
Intangible assets, net	$ 2,411	2,595
Customer Relationships [Member] | Minimum [Member]
Amortization Period (Year)	1 year
Customer Relationships [Member] | Maximum [Member]
Amortization Period (Year)	9 years
Developed Technology Rights [Member]
Gross Carrying Amount	$ 15,820	15,820
Accumulated Amortization	(13,117)	(12,829)
Intangible assets, net	$ 2,703	2,991
Developed Technology Rights [Member] | Minimum [Member]
Amortization Period (Year)	4 years
Developed Technology Rights [Member] | Maximum [Member]
Amortization Period (Year)	6 years
Trade Names [Member]
Gross Carrying Amount	$ 790	790
Accumulated Amortization	(635)	(622)
Intangible assets, net	$ 155	168
Trade Names [Member] | Minimum [Member]
Amortization Period (Year)	2 years
Trade Names [Member] | Maximum [Member]
Amortization Period (Year)	4 years
Order or Production Backlog [Member]
Amortization Period (Year)	1 year
Gross Carrying Amount	$ 100	100
Accumulated Amortization	(100)	(100)
Intangible assets, net
Patents [Member]
Gross Carrying Amount	1,800	1,800
Accumulated Amortization	(1,500)	(1,480)
Intangible assets, net	$ 300	320
Patents [Member] | Minimum [Member]
Amortization Period (Year)	7 years
Patents [Member] | Maximum [Member]
Amortization Period (Year)	10 years
Other Intangible Assets [Member]
Amortization Period (Year)	4 years
Gross Carrying Amount	$ 255	255
Accumulated Amortization	(255)	(255)
Intangible assets, net

Note 3 - Balance Sheet Compon29

Note 3 - Balance Sheet Components - Annual Amortization of Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
2018 (remaining six months)	$ 505
2,019	1,009
2,020	1,009
2,021	833
2,022	626
2023 and thereafter	1,587
Total future amortization expense	$ 5,569	$ 6,074

Note 4 - Stockholders' Equity30

Note 4 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions	May 31, 2017	Oct. 25, 2016	Jul. 31, 2001	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2001	Jun. 30, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period						6,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance				986,000		986,000			986,000	1,045,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				0		10,000
Share Price				$ 11.98		$ 11.98			$ 11.98
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value						$ 0.3
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value						$ 0.2
Stock Repurchase Program, Authorized Amount		$ 25
Stock Repurchase Program, Period in Force		2 years
Treasury Stock, Shares, Acquired				98,800		437,007			1,279,189
Treasury Stock Acquired, Average Cost Per Share									$ 14.59
Treasury Stock, Value, Acquired, Cost Method									$ 18.7
Stock Repurchase Program, Remaining Authorized Repurchase Amount				$ 25		$ 25			25
Employee Stock Option [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total				0.9		$ 0.9			0.9
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition						3 years
Restricted Stock Units (RSUs) [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total				$ 15.3		$ 15.3			$ 15.3
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition						2 years 109 days
Twenty Eleven Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	7,800,000
Share Based Compensation Arrangement By Share Based Payment Award Shares Reserved Decrease Rate	1.33
Common Stock, Capital Shares Reserved for Future Issuance				9,600,000		9,600,000			9,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant				4,100,000		4,100,000			4,100,000
Twenty Eleven Stock Incentive Plan [Member] | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Shares Previously Issued Under the 2001 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized								3,500,000
IDS Plan [Member] | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period								10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period								4 years
Two Thousand One Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period						500,000
Outside of the 2011, 2001 or IDS Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance				0		0			0
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period			10 years
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total				$ 1.3		$ 1.3			$ 1.3
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition						1 year 211 days
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			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				0	0	108,000	100,000
Employee Stock Purchase Plan Weighted Average Purchase Price of Shares Purchased						$ 9.29	$ 9.13
Number Of ESPP Shares Available For Future Issuance				4,200,000		4,200,000			4,200,000

Note 4 - Stockholders' Equity -

Note 4 - Stockholders' Equity - Allocation of Recognized Period Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Allocation of recognized period costs	$ 2,702	$ 2,904	$ 5,557	$ 5,788
Cost of Sales [Member]
Allocation of recognized period costs	968	1,069	1,981	2,261
Research and Development Expense [Member]
Allocation of recognized period costs	845	848	1,724	1,682
Selling, General and Administrative Expenses [Member]
Allocation of recognized period costs	$ 889	$ 987	$ 1,852	$ 1,845

Note 4 - Stockholders' Equity32

Note 4 - Stockholders' Equity - Stock Options, Valuation Assumptions (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Weighted average fair value (in dollars per share)			$ 4.28
Stock Plans [Member]
Expected life (Year)		4 years 149 days	4 years 156 days	4 years 149 days
Volatility		41.63%	42.22%	41.53%
Risk-free interest rate		1.67%	2.52%	1.69%
Expected dividend	0.00%	0.00%
Weighted average fair value (in dollars per share)		$ 5.98	$ 4.28	$ 6.16
Employee Stock Purchase Plan [Member]
Expected life (Year)			1 year 91 days	1 year 91 days
Volatility			37.23%	33.32%
Risk-free interest rate			1.93%	0.93%
Expected dividend			0.00%	0.00%
Weighted average fair value (in dollars per share)			$ 4.32	$ 6.78

Note 4 - Stockholders' Equity33

Note 4 - Stockholders' Equity - Stock Options Activity (Details) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018USD ($)$ / sharesshares	Jun. 30, 2018USD ($)$ / sharesshares
Outstanding (in shares)		1,045,000
Outstanding, weighted average exercise price (in dollars per share) | $ / shares		$ 9.65
Granted (in shares)	0	10,000
Exercised (in shares)		(59,000)
Exercised, weighted average exercise price (in dollars per share) | $ / shares		$ 7.069
Canceled (in shares)		(6,000)
Canceled, weighted average exercise price (in dollars per share) | $ / shares		$ 14.02
Expired (in shares)		(4,000)
Expired, weighted average exercise price (in dollars per share) | $ / shares		$ 16.22
Outstanding (in shares)	986,000	986,000
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 9.80	$ 9.80
Outstanding, weighted average remaining term (Year)		4 years 186 days
Outstanding, intrinsic value | $	$ 3,404	$ 3,404
Vested and expected to vest, June 30, 2018 (in shares)	977,000	977,000
Vested and expected to vest, weighted average exercise price (in dollars per share) | $ / shares	$ 9.71	$ 9.71
Vested and expected to vest, weighted average remaining term (Year)		4 years 160 days
Vested and expected to vest, intrinsic value | $	$ 3,403	$ 3,403
Exercisable, June 30, 2018 (in shares)	808,000	808,000
Exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 8.50	$ 8.50
Exercisable, weighted average remaining term (Year)		3 years 204 days
Exercisable, intrinsic value | $	$ 3,380	$ 3,380

Note 4 - Stockholders' Equity34

Note 4 - Stockholders' Equity - Stock Options Activity (Details) (Parentheticals)	6 Months Ended
	Jun. 30, 2018$ / shares
Weighted average fair value (in dollars per share)	$ 4.28

Note 4 - Stockholders' Equity35

Note 4 - Stockholders' Equity - Nonvested Restricted Stock Units Activity (Details) - Restricted Stock Units (RSUs) [Member] shares in Thousands	6 Months Ended
	Jun. 30, 2018$ / sharesshares
Outstanding, January 1, 2018 (in shares) | shares	1,617
Outstanding, January 1, 2018 (in dollars per share) | $ / shares	$ 15.66
Granted (in shares) | shares	10
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 11.26
Vested (in shares) | shares	(332)
Vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 16.19
Forfeited (in shares) | shares	(84)
Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares	$ 15.53
Outstanding, June 30, 2018 (in shares) | shares	1,211
Outstanding, June 30, 2018 (in dollars per share) | $ / shares	$ 15.49

Note 5 - Income Taxes (Details

Note 5 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2017
Increase (Decrease) in Income Taxes			$ 1,200
Income Tax Expense (Benefit), Total	$ (439)	$ (815)	$ (820)	$ (1,976)
Effective Income Tax Rate Reconciliation, Percent, Total			23.00%	156.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent						35.00%
Unrecognized Tax Benefits, Ending Balance	13,000		$ 13,000			$ 12,900
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	7,700		7,700			7,700
Unrecognized Tax Benefits In Long Term Liabilities	2,900		2,900
Unrecognized Tax Benefits In Deferred Tax Assets	10,800		10,800
Unrecognized Tax Benefits In Deferred Tax Asset Subject To Full Valuation Allowance	5,300		5,300
Deferred Tax Assets, Valuation Allowance, Total	$ 9,500		$ 9,500			$ 9,100
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent					21.00%

Note 6 - Net Income Per Share -

Note 6 - Net Income Per Share - Calculation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net income (loss)	$ (2,096)	$ 189	$ (2,520)	$ 706
Basic weighted-average common shares outstanding (in shares)	31,962	32,111	32,065	32,051
Effect of dilutive options and restricted stock (in shares)		1,277		1,440
Diluted weighted average shares outstanding (in shares)	31,962	33,388	32,065	33,491
Net income (loss) per share - Basic (in dollars per share)	$ (0.07)	$ 0.01	$ (0.08)	$ 0.02
Net income (loss) per share - Diluted (in dollars per share)	$ (0.07)	$ 0.01	$ (0.08)	$ 0.02

Note 6 - Net Income Per Share38

Note 6 - Net Income Per Share - Anti-dilutive Securities (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Anti-dilutive securities (in shares)		142		112
Employee Stock Option [Member]
Anti-dilutive securities (in shares)		102		79
Restricted Stock Units (RSUs) [Member]
Anti-dilutive securities (in shares)		13		4
Employee Stock Purchase Plan [Member]
Anti-dilutive securities (in shares)		27		29

Note 7 - Customer and Geograp39

Note 7 - Customer and Geographic Information (Details Textual)	6 Months Ended
	Jun. 30, 2018
Number of Operating Segments	1

Note 7 - Customer and Geograp40

Note 7 - Customer and Geographic Information - Revenue Percentage by Major Customers (Details) - Customer Concentration Risk [Member] - Sales Revenue, Net [Member]	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018		Jun. 30, 2017
Customer A [Member]
Receivables percentage by major customer	40.00%	36.00%	39.00%		42.00%
Customer B [Member]
Receivables percentage by major customer	10.00%	15.00%		[1]	10.00%
[1]	represents less than 10%

Note 7 - Customer and Geograp41

Note 7 - Customer and Geographic Information - Receivables Percentage by Major Customers (Details) - Customer Concentration Risk [Member] - Accounts Receivable [Member]	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Customer A [Member]
Receivables percentage by major customer	43.00%	41.00%
Customer B [Member]
Receivables percentage by major customer	18.00%	15.00%

Note 7 - Customer and Geograp42

Note 7 - Customer and Geographic Information - Revenues by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues	$ 21,119	$ 24,289	$ 45,856	$ 48,578
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member]
Revenues	$ 21,119	$ 24,289	$ 45,856	$ 48,578
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | UNITED STATES
Revenues	$ 8,982	$ 9,226	$ 19,065	$ 20,860
Concentration Risk, Percentage	42.00%	38.00%	41.00%	44.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | CHINA
Revenues	$ 4,360	$ 4,753	$ 9,542	$ 6,440
Concentration Risk, Percentage	21.00%	20.00%	21.00%	13.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | TAIWAN, PROVINCE OF CHINA
Revenues	$ 1,038	$ 3,643	$ 3,173	$ 7,480
Concentration Risk, Percentage	5.00%	15.00%	7.00%	15.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | Rest of the World [Member]
Revenues	$ 6,739	$ 6,667	$ 14,076	$ 13,798
Concentration Risk, Percentage	32.00%	27.00%	31.00%	28.00%

Note 7 - Customer and Geograp43

Note 7 - Customer and Geographic Information - Long-lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Long-lived assets	$ 28,095	$ 25,386
UNITED STATES
Long-lived assets	27,612	24,883
Rest of the World [Member]
Long-lived assets	$ 483	$ 503

Note 8 - Fair Value Measureme44

Note 8 - Fair Value Measurements (Details Textual) - Foreign Exchange Contract [Member] - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Derivative Asset, Notional Amount	$ 8,100,000		$ 8,100,000		$ 8,200,000
Other Current Assets [Member]
Derivative Asset, Current	35,000		35,000		$ 12,000
Other Nonoperating Income (Expense) [Member]
Derivative, Gain (Loss) on Derivative, Net, Total	$ (600,000)	$ 400,000	$ (400,000)	$ 500,000

Note 8 - Fair Value Measureme45

Note 8 - Fair Value Measurements - Fair Value, Assets Measured on a Recurring Basis (Details) - Money Market Funds [Member] - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Money market mutual funds	$ 26,814	$ 26,638
Fair Value, Inputs, Level 1 [Member]
Money market mutual funds	26,814	26,638
Fair Value, Inputs, Level 2 [Member]
Money market mutual funds
Fair Value, Inputs, Level 3 [Member]
Money market mutual funds

Note 9 - Commitments and Cont46

Note 9 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jul. 01, 2018
Operating Leases, Rent Expense, Net, Total	$ 700	$ 600	$ 1,300	$ 1,100
Operating Leases, Future Minimum Payments Due, Total	10,015		10,015
Purchase Obligation, Due in Next Twelve Months	13,700		13,700
Loss Contingency Accrual, Ending Balance	$ 0		$ 0
Lease in Santa Clara, California [Member] | Subsequent Event [Member]
Lessee, Operating Lease, Term of Contract					10 years
Operating Leases, Future Minimum Payments Due, Total					$ 7,000
Operating Lease, Abatement Allowance					400
Operating Lease, Tenant Improvement Allowance					$ 1,300

Note 9 - Commitments and Cont47

Note 9 - Commitments and Contingencies - Future Minimum Lease Payments Under Noncancelable Operating Leases (Details) $ in Thousands	Jun. 30, 2018USD ($)
2018 (remaining six months)	$ 718
2,019	1,307
2,020	1,374
2,021	1,291
2,022	1,061
2023 and thereafter	4,264
Total future minimum lease payments	$ 10,015