10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

☑	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the Quarterly Period ended June 30, 2014
	or
☐	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the transition period from _______________ to ______________

Commission File Number 000-31311

PDF SOLUTIONS, INC.

(Exact name of Registrant as Specified in its Charter)

Delaware	25-1701361
(State or Other Jurisdiction of	(I.R.S. Employer
Incorporation or Organization)	Identification No.)
333 West San Carlos Street, Suite 1000
San Jose, California	95110
(Address of Principal Executive Offices)	(Zip Code)

(408) 280-7900

(Registrant’s Telephone Number, Including Area Code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.       Yes ☑ No ☐

 Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes ☑ No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

☐ Large accelerated filer	☑ Accelerated filer	☐ Non-accelerated  filer	☐ Smaller reporting company
		(Do not check if a smaller reporting company)

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☑

The number of shares outstanding of the Registrant’s Common Stock as of August 1, 2014 was 30,854,866.

1

TABLE OF CONTENTS

	Page
PART I  FINANCIAL INFORMATION
Item 1. Financial Statements (Unaudited)
Condensed Consolidated Balance Sheets	3
Condensed Consolidated Statements of Operations and Comprehensive Income	4
Condensed Consolidated Statements of Cash Flows	5
Notes to Condensed Consolidated Financial Statements	6
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations	15
Item 3. Quantitative and Qualitative Disclosures About Market Risk	26
Item 4. Controls and Procedures	26
PART II  OTHER INFORMATION
Item 1. Legal Proceedings	27
Item 1A. Risk Factors	27
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds	27
Item 3. Defaults Upon Senior Securities	27
Item 4. Mine Safety Disclosures	27
Item 5. Other Information	27
Item 6. Exhibits	28
SIGNATURES	29
INDEX TO EXHIBITS	30

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PART I — FINANCIAL INFORMATION

Item 1. Financial Statements

PDF SOLUTIONS, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(unaudited)

(in thousands, except par value)

	June 30, 2014			December 31, 2013
ASSETS
Current assets:
Cash and cash equivalents	$	106,909		$	89,371
Accounts receivable, net of allowance of $327 and $354, respectively		30,705			34,860
Deferred tax assets - current portion		4,181			5,920
Prepaid expenses and other current assets		5,321			3,632
Total current assets		147,116			133,783
Property and equipment, net		8,497			7,064
Deferred tax assets - non-current portion		8,196			8,599
Other non-current assets		1,597			1,718
Total assets	$	165,406		$	151,164
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	933		$	1,129
Accrued compensation and related benefits		6,024			7,707
Accrued and other current liabilities		1,668			1,593
Deferred revenues		3,442			2,096
Billings in excess of recognized revenues		128			343
Total current liabilities		12,195			12,868
Non-current liabilities		3,409			3,584
Total liabilities		15,604			16,452
Commitments and contingencies (Note 10)
Stockholders’ equity:
Preferred stock, $0.00015 par value, 5,000 shares authorized, no shares issued and outstanding		—			—
Common stock, $0.00015 par value, 70,000 shares authorized: shares issued 35,873 and 35,285, respectively; shares outstanding 30,786 and 30,437, respectively		5			5
Additional paid-in-capital		242,514			233,813
Treasury stock at cost, 5,087 and 4,848 shares, respectively		(33,326	)		(28,905	)
Accumulated deficit		(59,698	)		(70,649	)
Accumulated other comprehensive income		307			448
Total stockholders’ equity		149,802			134,712
Total liabilities and stockholders’ equity	$	165,406		$	151,164

See accompanying Notes to Condensed Consolidated Financial Statements (unaudited).

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PDF SOLUTIONS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME

(unaudited)

(in thousands, except per share amounts)

	Three Months Ended June 30,						Six Months Ended June 30,
	2014			2013			2014			2013
Revenues:
Design-to-silicon-yield solutions	$	13,091		$	14,950		$	28,010		$	29,798
Gainshare performance incentives		11,519			9,826			23,686			19,088
Total revenues		24,610			24,776			51,696			48,886
Cost of design-to-silicon-yield solutions		8,847			9,741			18,552			19,398
Gross profit		15,763			15,035			33,144			29,488
Operating expenses:
Research and development		3,337			3,184			6,933			6,548
Selling, general and administrative		4,661			4,404			8,990			9,198
Amortization of other acquired intangible assets		12			19			30			37
Restructuring charges (credits)		—			9			57			(43	)
Total operating expenses		8,010			7,616			16,010			15,740
Income from operations		7,753			7,419			17,134			13,748
Interest and other income (expense), net		(27	)		(76	)		(114	)		174
Income before income taxes		7,726			7,343			17,020			13,922
Income tax provision		3,030			2,791			6,069			4,639
Net income	$	4,696		$	4,552		$	10,951		$	9,283
Net income per share:
Basic	$	0.15		$	0.15		$	0.36		$	0.31
Diluted	$	0.15		$	0.15		$	0.34		$	0.30
Weighted average common shares:
Basic		30,590			29,650			30,533			29,501
Diluted		31,882			31,154			31,923			30,985
Net income	$	4,696		$	4,552		$	10,951		$	9,283
Other comprehensive income:
Foreign currency translation adjustments, net of tax		(89	)		182			(141	)		13
Comprehensive income	$	4,607		$	4,734		$	10,810		$	9,296

See accompanying Notes to Condensed Consolidated Financial Statements (unaudited).

4

PDF SOLUTIONS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(unaudited)

(in thousands)

	Six Months Ended June 30,
	2014			2013
Operating activities:
Net income	$	10,951		$	9,283
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		940			575
Stock-based compensation expense		4,034			3,018
Amortization of acquired intangible assets		30			37
Deferred taxes		2,224			2,494
Loss (gain) on disposal of property and equipment		(93	)		3
Purchases of treasury stock in connection with tax withholdings on restricted stock grants		(855	)		(385	)
Reversal of allowance for doubtful accounts		(28	)		(82	)
Unrealized gain on foreign currency forward contract		(23	)		—
Tax benefit related to stock-based compensation expense		1,657			141
Excess tax benefit from stock-based compensation		(1,543	)		(79	)
Changes in operating assets and liabilities:
Accounts receivable		4,183			7,707
Prepaid expenses and other assets		(1,658	)		(2,027	)
Accounts payable		(321	)		(1,079	)
Accrued compensation and related benefits		(1,660	)		(3,622	)
Accrued and other liabilities		(649	)		(1,170	)
Deferred revenues		1,380			(219	)
Billings in excess of recognized revenues		(215	)		(291	)
Net cash provided by operating activities		18,354			14,304
Investing activities:
Purchases of property and equipment		(1,946	)		(2,537	)
Proceeds from the sales of property and equipment		135			—
Net cash used in investing activities		(1,811	)		(2,537	)
Financing activities:
Proceeds from exercise of stock options		2,398			2,810
Proceeds from employee stock purchase plan		632			546
Excess tax benefit from stock-based compensation		1,543			79
Purchases of treasury stock		(3,566	)		—
Net cash provided by financing activities		1,007			3,435
Effect of exchange rate changes on cash and cash equivalents		(12	)		(72	)
Net change in cash and cash equivalents		17,538			15,130
Cash and cash equivalents, beginning of period		89,371			61,637
Cash and cash equivalents, end of period	$	106,909		$	76,767
Supplemental disclosure of cash flow information:
Cash paid during the period for:
Taxes	$	2,702		$	2,303
Property and equipment received and accrued in accounts payable and accrued and other liabilities	$	788		$	350

See accompanying Notes to Condensed Consolidated Financial Statements (unaudited).

5

PDF SOLUTIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

1. BASIS OF PRESENTATION

Basis of Presentation

The interim unaudited condensed consolidated financial statements included herein have been prepared by PDF Solutions, Inc. (“the Company”) pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”), including the instructions to the Quarterly Report on Form 10-Q and Article 10 of Regulation S-X. Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted. The interim unaudited condensed consolidated financial statements reflect, in the opinion of management, all adjustments necessary (consisting only of normal recurring adjustments), to present a fair statement of results for the interim periods presented. The operating results for any interim period are not necessarily indicative of the results that may be expected for other interim periods or the full fiscal year. The accompanying interim unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto in the Company’s Annual Report on Form 10-K for the year ended December 31, 2013.

The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries after the elimination of all significant intercompany balances and transactions.

The condensed consolidated balance sheet at December 31, 2013, has been derived from the audited consolidated financial statements but does not include all disclosures required by accounting principles generally accepted in the United States of America.

Use of Estimates  —  The preparation of financial statements in conformity with generally accepted accounting principles in the United States (“U.S. GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Significant estimates in these financial statements include 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.

Revenue Recognition  — The Company derives revenue from two sources: Design-to-silicon-yield solutions and Gainshare performance incentives.

Design-to-Silicon-Yield Solutions — Revenue that is derived from Design-to-silicon-yield solutions comes from services and software licenses. The Company recognizes revenue of Design-to-silicon-yield solutions as follows:

The Company generates a significant portion of its Design-to-silicon-yield solutions revenue from fixed-price solution implementation service contracts delivered over a specific period of time. These contracts require reliable estimation of costs to perform obligations and the overall scope of each engagement. Revenue under project–based contracts for solution implementation services is recognized as services are performed using the cost-to-cost percentage of completion method of contract accounting. Losses on fixed-price solution implementation contracts are recognized in the period when they become probable. Revisions in profit estimates are reflected in the period in which the conditions that require the revisions become known and can be estimated. Revenue under time and materials contracts for solution implementation services are recognized as the services are performed. On occasion, the Company licenses its software products as a component of its fixed-price service contracts. In such instances, the software products are licensed to customers over a specified term of the agreement with support and maintenance to be provided at each customer's option over the license term. The amount of product and service revenue recognized in a given period is affected by the Company’s judgment as to whether an arrangement includes multiple deliverables and, if so, the Company’s determination of the fair value of each deliverable. In general, vendor-specific objective evidence of selling price (“VSOE”) does not exist for the Company’s solution implementation services and software products and because the Company’s services and products include our unique technology, the Company is not able to determine third-party evidence of selling price (“TPE”). Therefore, in such circumstances the Company uses best estimated selling prices (“BESP”) in the allocation of arrangement consideration. In determining BESP, the Company applies significant judgment as the Company’s weighs a variety of factors, based on the facts and circumstances of the arrangement. The Company typically arrives at BESP for a product or service that is not sold separately by considering company-specific factors such as geographies, internal costs, gross margin objectives, pricing practices used to establish bundled pricing, and existing portfolio pricing and discounting. After fair value is established for each deliverable, the total transaction amount is allocated to each deliverable based upon its relative fair value. Fees allocated to solution implementation services are recognized using the cost-to-cost percentage of completion method of contract accounting. Fees allocated to software and related support and maintenance are recognized under software revenue recognition guidance. 

6

 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.

 2. RECENT ACCOUNTING PRONOUNCEMENTS

In May 2014, the Financial Accounting Standards Board ("FASB") issued new accounting guidance related to revenue recognition. The core principle is that a company should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration for which the entity expects to be entitled in exchange for those goods or services. The updated standard will replace most existing revenue recognition guidance under GAAP when it becomes effective and permits the use of either the retrospective or cumulative effect transition method. Early adoption is not permitted. The updated standard will be effective for the Company beginning January 1, 2017 and can be applied either retrospectively to each period presented or as a cumulative-effect adjustment as of the date of adoption. The Company has not yet selected a transition method and is currently evaluating the impact of adopting this new accounting standard on its financial statements.

3. BALANCE SHEET COMPONENTS

Accounts receivable include amounts that are unbilled at the end of the period. Unbilled accounts receivable are determined on an individual contract basis and were $10.2 million and $8.0 million as of June 30, 2014, and December 31, 2013, respectively.

Property and equipment consists of (in thousands): 

	June 30, 2014			December 31, 2013
Property and equipment, net:
Computer equipment	$	10,044		$	9,969
Software		3,428			3,441
Furniture, fixtures and equipment		739			734
Leasehold improvements		1,129			1,052
Test equipment		5,682			4,928
Construction-in-progress		2,171			1,421
		23,193			21,545
Less: accumulated depreciation		(14,496	)		(14,481	)
Total	$	8,497		$	7,064

7

Depreciation and amortization expense was $0.5 million and $0.3 million for the three months ended June 30, 2014 and 2013, respectively. Depreciation and amortization expense was $0.9 million and $0.6 million for the six months ended June 30, 2014 and 2013, respectively.

Intangible assets balance was zero and $31,000 as of June 30, 2014, and December 31, 2013, respectively. The balance was included in other non-current assets in the accompanying condensed consolidated balance sheets. For the three-months ended June 30, 2014 and 2013, intangible asset amortization expense was $12,000 and $19,000, respectively. For the six months ended June 30, 2014 and 2013, intangible asset amortization expense was $30,000 and $37,000, respectively.

4. STOCKHOLDERS’ EQUITY

Stock-based compensation is estimated at the grant date based on the award’s fair value and is recognized on a straight-line basis over the vesting periods, generally four years. Stock-based compensation expenses before taxes related to the Company’s stock plans and employee stock purchase plan were allocated as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2014		2013		2014		2013
Cost of design-to-silicon yield-solutions	$	797	$	649	$	1,520	$	1,183
Research and development		434		337		805		659
Selling, general and administrative		1,143		723		1,709		1,176
Stock-based compensation expenses	$	2,374	$	1,709	$	4,034	$	3,018

On June 30, 2014, the Company has in effect the following stock-based compensation plans:

Stock Plans — At the annual meeting of stockholders on November 16, 2011, the Company’s stockholders approved the 2011 Stock Incentive Plan, which was first 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 and then subsequently amended at the 2014 annual meeting of stockholders on May 27, 2014, when the Company’s stockholders approved the Second Amended and Restated 2011 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 6,550,000 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.

8

The Company estimated the fair value of share-based awards granted under the Stock 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:

	Three Months Ended June 30,						Six Months Ended June 30,
	2014			2013			2014			2013
Expected life (in years)		4.58			4.78			4.58			4.78
Volatility		42.3	%		55.0	%		42.7	%		56.1	%
Risk-free interest rate		1.47	%		1.33	%		1.50	%		0.93	%
Expected dividend		—			—			—			—
Weighted average fair value per share of options granted during the period	$	7.15		$	8.50		$	7.39		$	7.77

As of June 30, 2014, 7.0 million shares of common stock were reserved to cover stock-based awards under the 2011 Plan, of which 3.9 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 June 30, 2014.  As of June 30, 2014, there were no outstanding awards that had been granted outside of the 2011, 2001 or the IDS Plans (collectively, the "Stock Plans"). 

Stock option activity under the Company’s Stock Plans during the six months ended June 30, 2014, was as follows:

	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, 2014		2,880		$	7.35
Granted (weighted average fair value of $7.39 per share)		12		$	19.72
Exercised		(371	)	$	6.46
Canceled		(16	)	$	9.87
Expired		(6	)	$	5.91
Outstanding, June 30, 2014		2,499		$	7.53		6.22	$	34,219
Vested and expected to vest, June 30, 2014		2,455		$	7.50		6.19	$	33,704
Exercisable, June 30, 2014		1,751		$	7.01		5.58	$	24,871

The aggregate intrinsic value in the table above represents the total intrinsic value based on the Company’s closing stock price of $21.22 per share as of June 30, 2014. The total intrinsic value of options exercised during the six months ended June 30, 2014, was $5.0 million.

As of June 30, 2014, there was $3.1 million of total unrecognized compensation cost related to unvested stock options. That cost is expected to be recognized over a weighted average period of 1.7 years. The total fair value of shares vested during the six months ended June 30, 2014, was $1.2 million.

Nonvested restricted stock units activity during the six months ended June 30, 2014, was as follows:

	Shares (in thousands)			Weighted Average Grant Date Fair Value Per Share
Nonvested, January 1, 2014		759		$	14.44
Granted		551		$	19.53
Vested		(164	)	$	13.81
Forfeited		(7	)	$	17.86
Nonvested, June 30, 2014		1,139		$	17.02

As of June 30, 2014, there was $16.7 million of total unrecognized compensation cost related to nonvested restricted stock units. That cost is expected to be recognized over a weighted average period of 3.1 years.   

9

Employee Stock Purchase Plan — In July 2001, the Company adopted a ten-year Employee Stock Purchase Plan (as amended, “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. 

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,
	2014			2013
Expected life (in years)		1.25			1.25
Volatility		34.6	%		46.1	%
Risk-free interest rate		0.18	%		0.19	%
Expected dividend		—			—
Weighted average fair value of purchase rights granted under the Purchase Plan	$	7.18		$	5.28

During the three months ended June 30, 2014 and 2013, the Company did not issue any shares under the Purchase Plan. During the six months ended June 30, 2014 and 2013, a total of 52,000 and 104,000 shares, respectively, were issued at a weighted-average purchase price of $12.10 and $5.24 per share, respectively, under the Purchase Plan. For the three-month periods ended June 30, 2014 and 2013, the Purchase Plan compensation expense was $0.1 million and $0.2 million, respectively. For the six months ended June 30, 2014 and 2013, the Purchase Plan compensation expense was $0.3 million and $0.4 million, respectively. As of June 30, 2014, there was $0.4 million of unrecognized compensation cost related to the Purchase Plan. That cost is expected to be recognized over a weighted average period of 1.0 years. As of June 30, 2014, 1.2 million shares were available for future issuance under the Purchase Plan.

Stock Repurchase Program — On November 8, 2012, the Board of Directors adopted a 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 June 30, 2014, 230,311 shares had been repurchased at the average price of $17.56 per share under this new program, at a total purchase of $4.0 million, and $16.0 million remained available for future repurchases.

5. RESTRUCTURING

The Company implemented restructuring plans during fiscal years 2012 and 2008, and recorded total restructuring charges of zero and $9,000 for the three months ended on June 30, 2014 and 2013, respectively. The Company recorded total restructuring charges of $57,000 for the six months ended June 30, 2014 and restructuring credits of $43,000 for the six months ended June 30, 2013. As of June 30, 2014, the Company had no outstanding restructuring accrual balance.

October 2012 Plan

On October 24, 2012, the Company announced a restructuring plan as part of the Company’s continuing efforts to simplify the organization, leverage cross-training and learning, and reduce annual operations expenses. Under this plan, the Company has recorded restructuring charges of $2.2 million, which primarily consisted of employee severance costs of $2.1 million. All outstanding accrual balance under this plan had been paid out as of June 30, 2014. The following table summarizes the activities of restructuring liabilities (in thousands) under this plan for the periods covered below:

	Three Months Ended June 30,						Six Months Ended June 30,
	2014			2013			2014			2013
Beginning balance	$	62		$	210		$	13		$	896
Restructuring charges (credits)		—			9			57			59
Cash payments		(62	)		(153	)		(70	)		(889	)
Ending balance	$	—		$	66		$	—		$	66

10

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. All remaining accrual balance under this plan had been paid out as of December 31, 2013. There were no restructuring activities incurred under this plan during the three and six months ended June 30, 2014. The following table summarizes the activities of restructuring liabilities (in thousands) under this plan for the periods covered below:

	Three Months Ended June 30,					Six Months Ended June 30,
	2014		2013			2014		2013
Beginning balance	$	—	$	224		$	—	$	448
Restructuring charges (credits)		—		—			—		(102	)
Adjustments		—		3			—		3
Cash payments		—		(122	)		—		(244	)
Ending balance	$	—	$	105		$	—	$	105

6. INCOME TAXES

Income tax provision increased $1.4 million for the six months ended June 30, 2014, to $6.1 million as compared to an income tax provision of $4.6 million for the six months ended June 30, 2013.  The Company’s effective tax rate was 35.66% and 33.32% for the six months ended June 30, 2014, and June 30, 2013, respectively.  The income tax provision for the six months ended June 30, 2014, was less than the provision at the statutory rate primarily due to changes in unrecognized tax benefits. The income tax provision for the six months ended June 30, 2013, was less than the provision at the statutory rate primarily due to the utilization of U.S. tax credits, offset by foreign withholding taxes, statutory taxes, and changes in unrecognized tax benefits.

On January 2, 2013, the President signed into law the American Taxpayer Relief Act which reinstated the U.S. Federal Research and Development tax credit retroactive to January 1, 2012, and extended the tax credit through December 31, 2013.  As a result of the new legislation, the Company recognized a benefit in the six months ended June 30, 2013 related to 12 months of fiscal 2012 as well as a benefit to the annual effective tax rate for the full year research tax credit for fiscal 2013, which amounted to $0.4 million. The expiration of the U.S Federal research tax credit resulted in zero tax credit for the six months ended June 30, 2014.

The Company’s total amount of unrecognized tax benefits, excluding interest and penalties, as of June 30, 2014, was $10.2 million, of which $6.2 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, 2013, was $10.2 million, of which $6.3 million, if recognized, would affect the Company's effective tax rate. As of June 30, 2014, the Company has recorded unrecognized tax benefits of $2.8 million, including interest and penalties, as long-term taxes payable in its condensed consolidated balance sheet. The remaining $7.8 million has been recorded net of our deferred tax assets, of which $4.0 million is subject to a full valuation allowance.

As of June 30, 2014, the Company believes that most of its deferred tax assets are “more likely than not” to be realized with the exception of California R&D tax credits that have not met the “more likely than not” realization threshold criteria because on an annual basis and pursuant to current law, the Company generates more California credits than California tax. As a result, at June 30, 2014, the excess California R&D tax credits continue to be subject to a full valuation allowance. In the event the Company concludes at a future financial reporting period that there has been a change in its ability to realize the California R&D credit deferred tax assets, and it is at such time no longer “more likely than not” that the Company will realize the tax credits before applicable expiration dates, the Company’s tax provision will increase in the period in which the Company makes such determination.

The Company conducts business globally and, as a result, files numerous consolidated and separate income tax returns in the U.S. federal, various state and foreign jurisdictions. Because the Company used some of the tax attributes carried forward from previous years to tax years that are still open, statutes of limitation remain open for all tax years to the extent of the attributes carried forward into tax year 2002 for federal and California tax purposes. The Company is not subject to income tax examinations in any other of its major foreign subsidiaries’ jurisdictions.

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7. NET INCOME PER SHARE

Basic net income per share is computed by dividing net income by weighted average number of common shares outstanding for the period (excluding outstanding stock options and shares subject to repurchase). Diluted net income per share is computed using the weighted-average number of common shares outstanding for the period plus the potential effect of dilutive securities which are convertible into common shares (using the treasury stock method), except in cases in which the effect would be anti-dilutive. Under the treasury stock method, the amount that the employee must pay for exercising stock options, the amount of compensation cost for future service that the Company has not yet recognized, and the amount of the tax benefits that would be recorded in additional paid-in capital when the award becomes deductible are assumed to be used to repurchase shares.  The following is a reconciliation of the numerators and denominators used in computing basic and diluted net income per share (in thousands except per share amount):

	Three Months Ended June 30,				Six Months Ended June 30,
	2014		2013		2014		2013
Numerator:
Net income	$	4,696	$	4,552	$	10,951	$	9,283
Denominator:
Basic weighted average common shares outstanding		30,590		29,650		30,533		29,501
Dilutive effect of equity incentive plans		1,292		1,504		1,390		1,484
Diluted weighted average common shares outstanding		31,882		31,154		31,923		30,985
Net income per share:
Basic	$	0.15	$	0.15	$	0.36	$	0.31
Diluted	$	0.15	$	0.15	$	0.34	$	0.30

The following table sets forth potential shares of common stock that are not included in the diluted net income per share calculation above because to do so would be anti-dilutive for the periods indicated (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2014		2013		2014		2013
Outstanding options		52		112		22		110
Nonvested restricted stock units		173		174		2		88
Employee Stock Purchase Plan		43		—		46		—
Total		268		286		70		198

 8. CUSTOMER AND GEOGRAPHIC INFORMATION

Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision maker, or group, in deciding how to allocate resources and in assessing performance.

The Company’s chief operating decision maker, the chief executive officer, reviews discrete financial information presented on a consolidated basis for purposes of regularly making operating decisions and assessing financial performance. Accordingly, the Company considers itself to be in one operating segment, specifically the licensing and implementation of yield improvement solutions for companies designing and/or manufacturing integrated circuits.

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The Company had revenues from individual customers in excess of 10% of total revenues as follows:

	Three Months Ended June 30,						Six Months Ended June 30,
Customer	2014			2013			2014			2013
A		50	%		32	%		48	%		32	%
B		14	%		23	%		16	%		19	%
C		11	%		18	%		12	%		21	%

The Company had gross accounts receivable from the following individual customers in excess of 10% of gross accounts receivable as follows:

Customer	June 30, 2014			December 31, 2013
A		45	%		36	%
B		21	%		17	%
C		11	%		23	%

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,
	2014					2013
	Revenues		Percentage of Revenues			Revenues		Percentage of Revenues
North America	$	10,158		41	%	$	10,816		44	%
Germany		9,034		37			5,241		21
South Korea		1,242		5			3,631		15
Japan		1,216		5			1,961		8
Rest of Asia		1,223		5			2,098		8
Rest of Europe		1,737		7			1,029		4
Total revenue	$	24,610		100	%	$	24,776		100	%

	Six Months Ended June 30,
	2014					2013
	Revenues		Percentage of Revenues			Revenues		Percentage of Revenues
North America	$	21,558		42	%	$	20,682		42	%
Germany		18,134		35			9,866		20
South Korea		3,502		7			8,544		18
Japan		2,929		6			4,222		9
Rest of Asia		2,717		5			3,642		7
Rest of Europe		2,856		5			1,930		4
Total revenue	$	51,696		100	%	$	48,886		100	%

Long-lived assets, net by geographic area are as follows (in thousands):

	June 30, 2014		December 31, 2013
North America	$	7,962	$	6,578
Asia		415		364
Europe		120		122
Total long-lived assets, net	$	8,497	$	7,064

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9. FAIR VALUE MEASUREMENTS

Fair value is the exit price, or the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants as of the measurement date. The multiple assumptions used to value financial instruments are referred to as inputs, and a hierarchy for inputs used in measuring fair value is established, that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs reflect assumptions market participants would use in pricing an asset or liability based on market data obtained from independent sources while unobservable inputs reflect a reporting entity’s pricing based upon its own market assumptions. These inputs are ranked according to a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels.

Level 1 -	Inputs are quoted prices in active markets for identical assets or liabilities.
Level 2 -	Inputs are quoted prices for similar assets or liabilities in an active market, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable and market-corroborated inputs which are derived principally from or corroborated by observable market data.
Level 3 -	Inputs are derived from valuation techniques in which one or more significant inputs or value drivers are unobservable.

The following table represents the Company’s assets measured at fair value on a recurring basis as of June 30, 2014, and the basis for that measurement (in thousands):

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	$	26,354	$	26,354	$	—	$	—

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 Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Money market mutual funds	$	26,353	$	26,353	$	—	$	—

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 both the three months and six months ended June 30, 2014, the Company recognized a realized loss on the contracts of $0.1 million, which is recorded in other income (expense), net in the Company’s Statement of Operations and Comprehensive Income.

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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 June 30, 2014, the Company had one outstanding forward contract with a notional amount of $7.2 million and recorded $23,000 other current assets associated with this outstanding forward contract. 

10. COMMITMENTS AND CONTINGENCIES

 Leases

The Company leases administrative and sales offices and certain equipment under noncancelable operating leases, which contain various renewal options and, in some cases, require payment of common area costs, taxes and utilities. These operating leases expire at various times through 2019. Rent expense was both $0.5 million for the three months ended June 30, 2014 and 2013. Rent expense was $1.0 million for both the six months ended June 30, 2014 and 2013.

Future minimum lease payments under noncancelable operating leases at June 30, 2014, are as follows (in thousands):

Year Ending December 31,	Amount
2014 (remaining six months)	$	947
2015		1,787
2016		1,717
2017		1,408
2018		801
Thereafter		66
Total future minimum lease payments	$	6,726

Litigation  — From time to time, the Company is subject to various claims and legal proceedings that arise in the ordinary course of business. The Company accrues for losses related to litigation when a potential loss is probable and the loss can be reasonably estimated in accordance with FASB requirements. During the reported period, the Company was not party to any material legal proceedings, thus no loss was probable and no amount was accrued at June 30, 2014. 

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

Forward-Looking Statements

The following discussion of our financial condition and results of operations contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. In some cases, you can identify forward-looking statements by terminology such as “may,” “could,” “should,” “expect,” “plan,” “anticipate,” “believe,” “estimate,” “predict,” “potential”, “target” or “continue,” the negative effect of terms like these or other similar expressions. Any statement concerning future financial performance (including future revenues, earnings or growth rates), ongoing business strategies or prospects, and possible actions taken by us or our subsidiaries, which may be provided by us are also forward-looking statements. These forward-looking statements are only predictions. Forward-looking statements are based on current expectations and projections about future events and are inherently subject to a variety of risks and uncertainties, many of which are beyond our control, which could cause actual results to differ materially from those anticipated or projected. All forward-looking statements included in this document are based on information available to us on the date of filing and we further caution investors that our business and financial performance are subject to substantial risks and uncertainties. We assume no obligation to update any such forward-looking statements. In evaluating these statements, you should specifically consider various factors, including the risk factors set forth at the end of Item 1A in our Annual Report on Form 10-K for the year ended December 31, 2013 filed with the Securities and Exchange Commission on March 14, 2014. All references to “we”, “us”, “our”, “PDF”, “PDF Solutions” or “the Company” refer to PDF Solutions, Inc.

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Overview

We analyze our customers’ IC design and manufacturing processes to identify, quantify, and correct the issues that cause yield loss to improve our customers’ profitability by improving time-to-market, increasing yield and reducing total design and manufacturing costs. We package our solutions in various ways to meet our customers’ specific business and budgetary needs, each of which provides us various revenue streams. We receive a mix of fixed fees and variable, performance-based fees for the vast majority of our yield improvement solutions. The fixed fees are typically reflective of the length of time and the resources needed to characterize a customer’s manufacturing process and receive preliminary results of proposed yield improvement suggestions. The variable fee, or what we call Gainshare, usually depends on our achieving certain yield targets by a deadline.  Variable fees are currently typically tied to wafer volume on the node size of the manufacturing facility where we performed the yield improvement solutions. We receive license fees and service fees for related installation, integration, training, and maintenance and support services for our software that we license on a stand-alone basis.

 Industry Trend

Consistent with the trend since 2010, we believe that the largest logic foundries will continue to increase their investment in leading edge nodes and capacity in 2014. Leading foundries are also investing in new technologies such as multi-patterned lithography and 3-D transistor architecture, which has resulted in an increase in our business, and improved results of operations in the past few years and to date in 2014.

Generally, the demand for consumer electronics and communications devices continues to drive technological innovation in the semiconductor industry as the need for products with greater performance, lower power consumption, reduced costs and smaller size continues to grow with each new product generation. In addition, advances in computing systems and mobile devices have fueled demand for higher capacity memory chips. To meet these demands, IC manufacturers and designers are constantly challenged to improve the overall performance of their ICs by designing and manufacturing ICs with more embedded applications to create greater functionality while lowering cost per transistor. As a result, both logic and memory manufacturers have migrated to more and more advanced manufacturing nodes, capable of integrating more devices with higher performance, higher density, and lower power. As this trend continues, companies will continually be challenged to improve process capabilities to optimally produce ICs with minimal random and systematic yield loss, which is driven by the lack of compatibility between the design and its respective manufacturing process. We believe that as volume production of deep submicron ICs continues to grow, the difficulties of integrating IC designs with their respective processes and ramping new manufacturing processes will create a greater need for products and services that address the yield loss and escalating cost issues the semiconductor industry is facing today and will face in the future.

Customer Contracts

Although a substantial portion of our total revenues are concentrated in a small number of customers, the total revenues for each of these customers in any period is the result of Design-to-silicon-yield solutions and Gainshare performance incentives revenues recognized in the period under multiple, separate contracts, with no interdependent performance obligations. These contracts were all entered into in the ordinary course of our business and contain general terms and conditions that are standard across most of our yield improvement solutions customers, including providing services typically targeted to one manufacturing process node, for example the 28 or 20 nanometer node. Fluctuations in future results may occur if any of these customers renegotiate pre-existing contractual commitments due to adverse changes in their own business or, in the case of one time and materials contract, if the customer takes advantage of contractual provisions that permit the suspension of contracted work for a period if their business experiences a financial hardship. See the additional discussion in Part I, Item 1, "Customers," on page 8 of our Annual Report on Form 10-K for the year ended December 31, 2013, and in Item 1A, "Risk Factors," on pages 11 through 17 of the Annual Report on Form 10-K for the year ended December 31, 2013 for related information on the risks associated with customer concentration and Gainshare performance incentives revenue.

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Financial Highlights

Financial highlights for the three months ended June 30, 2014, were as follows:

• Total revenues for the three months ended June 30, 2014, were $24.6 million, a decrease of $0.2 million, or 1%, compared to $24.8 million for the three months ended June 30, 2013. Design-to-silicon-yield solutions revenue for the three months ended June 30, 2014, was $13.1 million, a decrease of $1.9 million, or 12%, when compared to Design-to-silicon yield solutions revenue of $15.0 million for the three months ended June 30, 2013. Gainshare performance incentives revenue for the three months ended June 30, 2014, was $11.5 million, an increase of $1.7 million, or 17%, compared to $9.8 million for the three months ended June 30, 2013. The increase in revenue from Gainshare performance incentives was primarily the result of higher wafer volumes at customers’ manufacturing facilities.

•  Net income for the three months ended June 30, 2014, was $4.7 million, compared to $4.6 million for the three months ended June 30, 2013. The increase in net income was primarily attributable to an increase in gross margin of $0.7 million, offset by an increase of total operating expenses of $0.4 million and an increase in income tax provision of $0.2 million. The increase in gross margin is reflective of the mix shift between Design-to-silicon yield solutions and Gainshare performance incentive revenue. 

•  Net income per basic and diluted share was $0.15 for the three months ended June 30, 2014, which was the same as the net income per basic and diluted share for the three months ended June 30, 2013.

•  Cash and cash equivalents increased $17.5 million from $89.4 million at December 31, 2013, to $106.9 million at June 30, 2014,  primarily due to an increase in cash from operating and financing activities during the period.

Financial highlights for the six months ended June 30, 2014, were as follows:

• Total revenues for the six months ended June 30, 2014, were $51.7 million, an increase of $2.8 million, or 6%, compared to $48.9 million for the three months ended June 30, 2013. Design-to-silicon-yield solutions revenue for the six months ended June 30, 2014, was $28.0 million, a decrease of $1.8 million, or 6%, when compared to Design-to-silicon yield solutions revenue of $29.8 million for the six months ended June 30, 2013. Gainshare performance incentives revenue for the six months ended June 30, 2014, was $23.7 million, an increase of $4.6 million, or 24%, compared to $19.1 million for the six months ended June 30, 2013. The increase in revenue from Gainshare performance incentives was primarily the result of higher wafer volumes at customers’ manufacturing facilities. 

•  Net income for the six months ended June 30, 2014, was $11.0 million, compared to $9.3 million for the six months ended June 30, 2013. The increase in net income was primarily attributable to an increase in gross margin of $3.7 million, offset by an increase in total operating expenses of $0.3 million, a higher interest and other expense of $0.3 million and an increase in income tax provision of $1.4 million. The increase in gross margin is reflective of the mix shift between Design-to-silicon yield solutions and Gainshare performance incentive revenue. 

•  Net income per basic and diluted share was $0.36 and $0.34, respectively, for the six months ended June 30, 2014 compared to net income per basic and diluted share of $0.31 and $0.30, respectively, for the six months ended June 30, 2013, an increase of $0.05 and $0.04 per basic and diluted share, respectively.

Critical Accounting Policies

There were no significant changes in our critical accounting policies. Please refer to Management’s Discussion and Analysis of Financial Condition and Results of Operations contained in Part II, Item 7 of our Annual Report on Form 10-K for the year ended December 31, 2013. The following is a brief discussion of the more significant accounting policies and methods that we use.

General

Our discussion and analysis of our financial conditions, results of operations and cash flows are based on our consolidated financial statements, which have been prepared in conformity with accounting principles generally accepted in the United States of America. Our preparation of these consolidated financial statements requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the dates of the financial statements and the reported amounts of revenues and expenses during the reporting periods. We based our estimates on historical experience and on various other assumptions that we believe to be reasonable under the circumstances. The most significant estimates and assumptions relate to revenue recognition, stock-based compensation and the realization of deferred tax assets. Actual amounts may differ from such estimates under different assumptions or conditions.

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 Revenue Recognition

We derive revenue from two sources: Design-to-silicon-yield solutions, which include services and software licenses, and Gainshare performance incentives.

Design-to-Silicon-Yield Solutions — Revenue that is derived from Design-to-silicon-yield solutions comes from services and software licenses. We recognize revenue for Design-to-silicon-yield solutions as follows:

We generate a significant portion of our 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 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. If we do not accurately estimate the resources required or the scope of work to be performed, or do not manage the projects properly within the planned period of time or satisfy our obligations under contracts, resulting contract margins could be materially different than those anticipated when the contracts were executed. Any such reductions in contract margin could have a material negative impact on our operating results.  Revenue under certain time and materials contracts for solution implementation services is recognized as the services are performed. On occasion, we license our software products as a component of our 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 our judgment as to whether an arrangement includes multiple deliverables and, if so, our determination of the fair value of each deliverable. In general, vendor-specific objective evidence of selling price (“VSOE”)  does not exist for our solution implementation services and software products and because our services and products include our unique technology, we are not able to determine third-party evidence of selling price (“TPE”). Therefore, in such circumstances, we use best estimated selling prices (“BESP”) in our allocation of arrangement consideration. In determining BESP, we apply significant judgment as we weigh a variety of factors, based on the facts and circumstances of the arrangement. We typically arrive 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.

 We also license our software products separately from our solution implementation services. 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 our fixed price solution implementations), installation, and training, revenue is allocated to each element of a transaction based upon its fair value as determined by our VSOE and such services are recorded as services revenues. VSOE for maintenance is generally established based upon negotiated renewal rates while VSOE for consulting, installation, and training services is established based upon our customary pricing for such services when sold separately. Revenues for software licenses with extended payment terms are not recognized in excess of amounts due. For software license arrangements that require significant modification or customization of the underlying software, the software license revenues are recognized as services are performed using the cost-to-cost percentage of completion method of contract accounting, and such revenues are recorded as services revenue.

Gainshare Performance Incentives  — When we enter into a contract to provide yield improvement services, the contract usually includes two components: (1) a fixed fee for performance by us of services delivered over a specific period of time; and (2) a Gainshare performance incentives component where the customer may pay a contingent variable fee, usually after the fixed fee period has ended. Revenues derived from Gainshare performance incentives represent profit sharing and performance incentives earned contingent upon our 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 us. Due to the uncertainties surrounding attainment of such operational levels, we recognize Gainshare performance incentives revenues (to the extent of completion of the related solution implementation services) upon receipt of performance reports or other related information from our customers supporting the determination of amounts and probability of collection. Gainshare performance incentives revenue is dependent on many factors which are outside our control, which can include among others, continued production of the related ICs by our customers, sustained yield improvements by our customers, and our ability to enter into new Design-to-silicon-yield solutions contracts containing provisions for Gainshare performance incentives.

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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.

We have 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 our common stock over the most recent period commensurate with the estimated expected life of 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 stock options.

Income Taxes

We are required to assess the likelihood that our deferred tax assets will be recovered from future taxable income and if we believe that they are not likely to be realizable before the expiration dates applicable to such assets then, to the extent we believe that recovery is not likely, establish a valuation allowance. Changes in the net deferred tax assets, less offsetting valuation allowance, in a period are recorded through the income tax provision in the condensed consolidated statements of operations. As of June 30, 2014, we believe that most of our deferred tax assets are “more likely than not” to be realized with the exception of  California R&D tax credits that have not met the “more likely than not” realization threshold criteria because on an annual basis and pursuant to current law, we generate more California credits than California tax. As a result, at June 30, 2014, the excess California R&D tax credits continue to be subject to a full valuation allowance. See Note 6 to the condensed consolidated financial statements for further disclosures regarding our income taxes. In the event we conclude at a future financial reporting period that there has been a change in our ability to realize our California R&D credit deferred tax assets, and it is at such time no longer “more likely than not” that we will realize the tax credits before applicable expiration dates, our tax provision will increase in the period in which we make such determination.

Our income tax calculations are based on application of the respective U.S. federal, state or foreign tax law. Our tax filings, however, are subject to audit by the respective tax authorities. Accordingly, we recognize tax liabilities based upon our 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.

 Recent Accounting Pronouncements and Accounting Changes

See Note 2 of “Notes to Condensed Consolidated Financial Statements (Unaudited)” of this Quarterly Report on Form 10-Q for a description of recent accounting pronouncements and accounting changes, including the expected dates of adoption and estimated effects, if any, on our consolidated financial statements.

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Results of Operations

The following table sets forth, for the periods indicated, the percentage of total revenues represented by the line items reflected in our condensed consolidated statements of operations:

	Three Months Ended June 30,						Six Months Ended June 30,
	2014			2013			2014			2013
Revenues:
Design-to-silicon-yield solutions		53	%		60	%		54	%		61	%
Gainshare performance incentives		47			40			46			39
Total revenues		100	%		100	%		100	%		100	%
Costs of design-to-silicon-yield solutions		36			39			36			40
Gross profit		64			61			64			60
Operating expenses:
Research and development		14			13			13			13
Selling, general and administrative		19			18			18			19
Amortization of other acquired intangible assets		—			—			—			—
Restructuring charges (credits)		—			—			—			—
Total operating expenses		33			31			31			32
Income from operations		31			30			33			28
Interest and other income (expense), net		—			(1	)		—			1
Income before taxes		31			29			33			29
Income tax provision		12			11			12			10
Net income		19	%		18	%		21	%		19	%

Comparison of the Three Months Ended June 30, 2014 and 2013

	Three Months Ended June 30,
					$			%
Revenues	2014		2013		Change			Change
(in thousands, except for percentages)
Design-to-silicon-yield solutions	$	13,091	$	14,950	$	(1,859	)		(12	)%
Gainshare performance incentives		11,519		9,826		1,693			17	%
Total	$	24,610	$	24,776	$	(166	)		(1	)%

Design-to-Silicon-Yield Solutions. Design-to-silicon-yield solutions revenue is derived from services (including solution implementations, software support and maintenance, consulting, and training) and software licenses, provided during our customer yield improvement engagements as well as during solution product sales.  Design-to-silicon-yield solutions revenue decreased $1.9 million for the three months ended June 30, 2014, compared to the three months ended June 30, 2013, primarily due to a decrease in fixed fee integrated solutions, the result of lower billable hours to revenue-generating projects in the period due the completion of certain engagements during the quarter and timing of signing new engagements. Our Design-to-silicon-yield solutions revenue may fluctuate in the future and is dependent on a number of factors, including the semiconductor industry’s continued acceptance of our solutions, the timing of purchases by existing customers, and our ability to attract new customers and penetrate new markets including photovoltaic and LED, and further penetration of our current customer base. Fluctuations in future results may also occur if any of our significant customers renegotiate pre-existing contractual commitments due to adverse changes in their own business or, in the case of a time and materials contract, may take advantage of contractual provisions that permit the suspension of contracted work for a period if their business experiences a financial hardship.

Gainshare Performance Incentives. Gainshare performance incentives revenues represent profit sharing and performance incentives earned contingent upon our customers reaching certain defined operational levels. Revenue derived from Gainshare performance incentives increased $1.7 million for the three months ended June 30, 2014, compared to the three months ended June 30, 2013.  The increase was primarily the result of higher wafer volumes at customers’ manufacturing facilities. Our Gainshare performance incentives revenue may continue to fluctuate from period to period. Gainshare performance incentives revenue is dependent on many factors that are outside our control, including among others, continued production of ICs by our customers at facilities at which we generate gainshare, sustained yield improvements by our customers, and our ability to enter into new Design-to-silicon-yield solutions contracts containing provisions for Gainshare performance incentives.

	Three Months Ended June 30,				$			%
Cost of Design-to-Silicon-Yield Solutions	2014		2013		Change			Change
(in thousands, except for percentages)
Costs of Design-to-silicon-yield solutions	$	8,847	$	9,741	$	(894	)		(9	)%

20

Costs of Design-to-Silicon-Yield Solutions. Costs of Design-to-silicon-yield solutions consist of costs incurred to provide and support our services and costs recognized in connection with licensing our software. Services costs consist of material, employee compensation and related benefits, overhead costs, travel and facilities-related costs. Software license costs consist of costs associated with licensing third-party software sold in conjunction with our software products. Costs of Design-to-silicon-yield solutions for the three months ended June 30, 2014, decreased $0.9 million compared to the three months ended June 30, 2013. The decrease is primarily due to a $0.5 million decrease in personnel-related expense, a result of lower variable compensation, a $0.1 million decrease in allocated facility expense, a $0.1 million decrease in equipment shipping cost and a $0.4 million increase in deferred cost due to timing of completion of the contract signature process, offset by a $0.1 million increase in travel expense and a $0.1 million increase in depreciation expense related to our test equipment. 

	Three Months Ended June 30,				$		%
Research and Development	2014		2013		Change		Change
(in thousands, except for percentages)
Research and development	$	3,337	$	3,184	$	153		5	%

Research and Development. Research and development expenses consist primarily of personnel-related costs to support product development activities, including compensation and benefits, outside development services, travel and facilities cost allocations, and stock-based compensation charges. Research and development expenses increased $0.2 million for the three months ended June 30, 2014, compared to the three months ended June 30, 2013, primarily due to a $0.1 million increase in subcontractor expense and a $0.1 million increase in allocated facility expense. We anticipate our expenses in research and development will fluctuate in absolute dollars from period to period as a result of cost control initiatives and the timing of when we hire personnel as a result of the size and the timing of product development projects.

	Three Months Ended June 30,				$		%
Selling, General and Administrative	2014		2013		Change		Change
(in thousands, except for percentages)
Selling, general and administrative	$	4,661	$	4,404	$	257		6	%

Selling, General and Administrative. Selling, general and administrative expenses consist primarily of compensation and benefits for sales, marketing and general and administrative personnel, legal and accounting services, marketing communications, travel and facilities cost allocations, and stock-based compensation charges. Selling, general and administrative expenses increased $0.3 million for the three months ended June 30, 2014, compared to the three months ended June 30, 2013, primarily due to a $0.4 million increase in stock-based compensation expense, which was mainly due to the impact of accelerated vesting of awards granted to our exiting board members, a $0.1 million increase in provisions for doubtful accounts, offset by a $0.1 million decrease in personnel-related expense, which was mainly due to decreased variable compensation and a $0.1 million decrease in outside services expense. We anticipate our selling, general and administrative expenses will fluctuate in absolute dollars from period to period as a result of cost control initiatives and to support increased selling efforts in the future.

	Three Months Ended June 30,				$			%
Amortization of Other Acquired Intangible Assets	2014		2013		Change			Change
(in thousands, except for percentages)
Amortization of other acquired intangible assets	$	12	$	19	$	(7	)		(37	)%

21

Amortization of Other Acquired Intangible Assets. Amortization of other acquired intangible assets consists of amortization of intangibles acquired as a result of certain business combinations. Amortization of other acquired intangible assets for the three months ended June 30, 2014, decreased $7,000 compared to the three months ended June 30, 2013. Our intangible balance was fully amortized as of June 30, 2014.

	Three Months Ended June 30,				$			%
Restructuring Charges (credits)	2014		2013		Change			Change
(in thousands, except for percentages)
Restructuring charges (credits)	$	—	$	9	$	(9	)		(100	)%

Restructuring Charges (credits).  No restructuring charges recorded during the three months ended June 30, 2014. Restructuring charges for the three months ended June 30, 2013 were not significant.

	Three Months Ended June 30,						$		%
Interest and Other Income (Expense), Net	2014			2013			Change		Change
(in thousands, except for percentages)
Interest and other income (expense), net	$	(27	)	$	(76	)	$	49		(64	)%

Interest and Other Income (expense), net.  Interest and other income (expense), net decreased $49,000 for the three months ended June 30, 2014 compared to the three months ended June 30, 2013. During the three months ended June 30, 2014, the gains (losses) related to foreign currency exposure was not significant. During the three months ended June 30, 2013, we recorded $0.1 million of losses on foreign currency exchange. We anticipate interest and other income (expense) will fluctuate in future periods as a result of our projected use of cash and fluctuations of foreign exchange rates.

	Three Months Ended June 30,				$		%
Income Tax Provision	2014		2013		Change		Change
(in thousands, except for percentages)
Income tax provision	$	3,030	$	2,791	$	239		9	%

Income Tax Provision. Income tax provision increased $0.2 million for the three months ended June 30, 2014, compared to three months ended June 30, 2013, primarily due to an increase in level of income. The income tax provision for the three months ended June 30, 2013, was less than the provision at the statutory rate primarily due to the utilization of U.S tax credits, offset by foreign withholding taxes, statutory taxes, and changes in unrecognized tax benefits.

 Comparison of the Six Months Ended June 30, 2014 and 2013

	Six Months Ended June 30,				$			%
Revenues	2014		2013		Change			Change
(In thousands, except for percentages)
Design-to-silicon-yield solutions	$	28,010	$	29,798	$	(1,788	)		(6	)%
Gainshare performance incentives		23,686		19,088		4,598			24	%
Total	$	51,696	$	48,886	$	2,810			6	%

Design-to-Silicon-Yield Solutions. Design-to-silicon-yield solutions revenue decreased $1.8 million for the six months ended June 30, 2014 compared to the six months ended June 30, 2013, primarily due to a decrease in fixed fee integrated solutions, the result of lower billable hours to revenue-generating projects in the period due to timing the completion of certain engagements during the periods and timing of signing new engagements. Our Design-to-silicon-yield solutions revenue may fluctuate in the future and are dependent on a number of factors, including the semiconductor industry’s continued acceptance of our solutions, the timing of purchases by existing customers, and our ability to attract new customers and penetrate new markets including photovoltaic and LED, and further penetration of our current customer base. Fluctuations in future results may also occur if any of our significant customers renegotiate pre-existing contractual commitments due to adverse changes in their own businesses or, in the case of a time and materials contract, may take advantage of contractual provisions that permit the suspension of contracted work for a period if their business experiences a financial hardship.

22

Gainshare Performance Incentives. Revenue derived from gainshare performance incentives increased $4.6 million for the six months ended June 30, 2014 compared to the six months ended June 30, 2013.  The increase was primarily the result of higher wafer volumes at customers’ manufacturing facilities. Our gainshare performance incentives revenue may continue to fluctuate from period to period. Gainshare performance incentives revenue is dependent on many factors that are outside our control, including among others, continued production of ICs by our customers at facilities at which we generate gainshare, sustained yield improvements by our customers, and our ability to enter into new Design-to-silicon-yield solutions contracts containing provisions for gainshare performance incentives.

	Six Months Ended June 30,				$			%
Cost of Design-to-Silicon-Yield Solutions	2014		2013		Change			Change
(In thousands, except for percentages)
Cost of Design-to-Silicon-Yield Solutions	$	18,552	$	19,398	$	(846	)		(4	)%

Costs of Design-to-Silicon-Yield Solutions.   Costs of Design-to-silicon-yield solutions decreased $0.8 million for the six months ended June 30, 2014 compared to the six months ended June 30, 2013. The decrease was primarily due to a $1.0 million increase in deferred cost due to timing of completion of the contract signature process, a $0.2 million decrease in subcontractor expense, a $0.1 million decrease in third party software cost, a $0.1 million decrease in equipment shipping cost, offset by a $0.2 million increase in personnel-related expense, which was due to increase in headcount and annual salary offset by a decrease in variable compensation, a $0.2 million increase in travel expense and a $0.2 million increase in depreciation expense related to our test equipment.

	Six Months Ended June 30,				$		%
Research and Development	2014		2013		Change		Change
(In thousands, except for percentages)
Research and development	$	6,933	$	6,548	$	385		6	%

Research and Development. Research and development expenses increased $0.4 million for the six months ended June 30, 2014 compared to the six months ended June 30, 2013, primarily due to a $0.1 million increase in personnel-related expense, a $0.1 million increase in outside service expenses, a $0.1 million increase in lab supplies and a $0.1 million increase in facility expense. We anticipate our expenses in research and development will fluctuate in absolute dollars from period to period as a result of cost control initiatives and the timing of when we hire personnel as a result of the size and the timing of product development projects and revenue generating activity requirements.

	Six Months Ended June 30,				$			%
Selling, General and Administrative	2014		2013		Change			Change
(In thousands, except for percentages)
Selling, general and administrative	$	8,990	$	9,198	$	(208	)		(2	)%

Selling, General and Administrative. Selling, general and administrative expenses decreased $0.2 million for the six months ended June 30, 2014 compared to the six months ended June 30, 2013, primarily due to $0.2 million decrease in personnel-related expense, which was mainly due to decreased variable compensation, a $0.3 million decrease in subcontractor expense, a $0.1 million decrease in legal and accounting expense, offset by a $0.4 million increase in stock-based compensation expense due to the impact of accelerated vesting of awards granted to our exiting board members.

	Six Months Ended June 30,				$			%
Amortization of Other Acquired Intangible Assets	2014		2013		Change			Change
(In thousands, except for percentages)
Amortization of other acquired intangible assets	$	30	$	37	$	(7	)		(19	)%

Amortization of Other Acquired Intangible Assets. Amortization of other acquired intangible assets slightly decreased for the six months ended June 30, 2014 compared to the six months ended June 30, 2013. The acquired intangible assets were fully amortized as of June 30, 2014.

	Six Months Ended June 30,					$		%
Restructuring Charges (Credits)	2014		2013			Change		Change
(In thousands, except for percentages)
Restructuring charges (credits)	$	57	$	(43	)	$	100		(233	)%

23

Restructuring Charges (Credits).   For the six months ended June 30, 2014, we recorded restructuring charges of $57,000, which represented severance charges related to the October 2012 Plan. For the six months ended June 30, 2013, we recorded restructuring credits of $43,000, which were primarily due to the change in estimate.

	Six Months Ended June 30,					$			%
Interest and Other Income (Expense), Net	2014			2013		Change			Change
(In thousands, except for percentages)
Interest and other income (expense), net	$	(114	)	$	174	$	(288	)		(166	)%

Interest and Other Income (Expense), Net.  Interest and other income (expense) decreased $0.3 million for the six months ended June 30, 2014 compared to the six months ended June 30, 2013. During the six months ended June 30, 2014, we recorded $0.1 million losses on foreign currency expense, primarily related to Yen to U.S Dollar exchange rate. During the six months ended June 30, 2013, we recorded gains on foreign currency exchange related to Euro and Yen to U.S Dollar exchange rate. We anticipate interest and other income (expense), net will fluctuate in future periods as a result of our projected use of cash and fluctuations of foreign exchange rates.

	Six Months Ended June 30,				$		%
Income Tax Provision	2014		2013		Change		Change
(In thousands, except for percentages)
Income tax provision	$	6,069	$	4,639	$	1,430		31	%

Income Tax Provision. Income tax provision increased $1.4 million for the six months ended June 30, 2014 compared to six months ended June 30, 2013, primarily due to an increase in level of income. The income tax provision for the six months ended June 30, 2014 was less than the provision at the statutory rate primarily due to changes in unrecognized tax benefits. The income tax provision for the six months ended June 30, 2013 was less than the provision at the statutory rate primarily due to changes in unrecognized tax benefits and the benefit of the research and development tax credit.

Liquidity and Capital Resources

Operating Activities

Cash flows provided by operating activities was $18.4 million for the six months ended June 30, 2014. This resulted from net income of $11.0 million, the addition of $6.3 million from non-cash charges and cash increase of $1.1 million reflected in the net change of operating assets and liabilities. Non-cash charges consisted primarily of stock-based compensation of $4.0 million, deferred taxes of $2.2 million, tax benefit related to stock-based compensation plan of $1.7 million, depreciation and amortization of $0.9 million, partially offset by excess tax benefit from stock-based compensation of $1.5 million, purchases of treasury stock in connection with tax withholdings on restricted stock grants of $0.9 million and gain on disposal of property and equipment of $0.1 million. Cash flow increases resulting from the net change in operating assets and liabilities primarily consisted of $4.2 million decrease in accounts receivable, primarily driven by strong collections, $1.2 million net increase in deferred revenue and billing in excess of recognized revenue, offset by $1.7 million increase in prepaid expense and other assets due to timing of prepayment of third party software cost, $0.3 million decrease in accounts payable, $1.7 million decrease in accrued compensation and related benefits, driven by the payment of variable compensation during the period, and $0.6 million decrease in accrued and other liabilities. The $5.3 million combined cash flow increase resulting from the decrease in accounts receivable, the increase in deferred revenue and the decrease in billings in excess of recognized revenues was primarily due to the timing of billing milestones and payments received.  

Cash flows provided by operating activities was $14.3 million for the six months ended June 30, 2013. This resulted from net income of $9.3 million, the addition of $5.7 million from non-cash charges, offset by the cash decrease of $0.7 million reflected in the net change of operating assets and liabilities. Non-cash charges consisted primarily of stock-based compensation of $3.0 million, deferred taxes of $2.5 million, depreciation and amortization of $0.6 million, tax benefit related to stock-based compensation plan of $0.1 million, partially offset by purchases of treasury stock in connection with tax withholdings on restricted stock grants of $0.4 million, reversal of doubtful accounts of $0.1 million and excess tax benefit from stock-based compensation of $0.1 million. Cash flow decreases resulting from the net change in operating assets and liabilities primarily consisted of $3.6 million decrease in accrued compensation and related benefits, $1.1 million decrease in accounts payable, $1.2 million decrease in accrued and other liabilities, $2.0 million decrease in prepaid expenses and other assets, $0.2 million decrease in deferred revenues and $0.3 million decrease in billings in excess of recognized revenues, offset by $7.7 million decrease in accounts receivable. The $7.2 million combined cash flow increase resulted from the decrease in accounts receivable, the decrease in deferred revenue and the decrease in billings in excess of recognized revenues was primarily due to the timing of billing milestones and payments received.

24

Investing Activities

Cash flows used in investing activities for the six months ended June 30, 2014 of $1.8 million consisted of $1.9 million payment for capital expenditures, primarily test equipment, offset by proceeds from the sales of property and equipment of $0.1 million.

Cash flows used in investing activities for the six months ended June 30, 2013 of $2.5 million consisted of payment for capital expenditures, primarily test equipment.

Financing Activities

      Cash flows provided by financing activities of $1.0 million for the six months ended June 30, 2014, consisted primarily of $2.4 million of proceeds from the exercise of stock options, $0.6 million of proceeds from our Employee Stock Purchase Plan, $1.5 million of excess tax benefit from stock-based compensation, offset by $3.5 million of cash used to repurchase shares of our common stock.

     Cash flows provided by financing activities of $3.4 million for the six months ended June 30, 2013 consisted primarily of $2.8 million of proceeds from the exercise of stock options, $0.5 million of proceeds from our Employee Stock Purchase Plan and $0.1 million of excess tax benefit from stock-based compensation. 

Liquidity

As of June 30, 2014, our working capital, defined as total current assets less total current liabilities, was $134.9 million, compared with $120.9 million as of December 31, 2013. Cash and cash equivalents were $106.9 million as of June 30, 2014, compared to $89.4 million as of December 31, 2013.  As of June 30, 2014 and December 31, 2013, cash and cash equivalents held by our foreign subsidiaries were $2.6 million and $2.0 million, respectively. We anticipate that our overall expenses, as well as planned capital expenditures, may constitute a material use of our cash resources. In addition, we may use cash resources to continue to fund our R&D efforts, repurchase common stock or fund potential investments in, or acquisitions of complementary products, technologies or businesses. We believe that our existing cash resources and anticipated funds from operations will satisfy our cash requirements to fund our operating activities, capital expenditures and other obligations for at least the next twelve months. 

 Off-Balance Sheet Agreements

We do not have any off-balance sheet arrangements, investments in special purpose entities or undisclosed borrowings or debt.

 We indemnify certain customers from third-party claims of intellectual property infringement relating to the use of our products. Historically, costs related to these guarantees of indemnification have not been significant. We are unable to estimate the maximum potential impact of these guarantees on our future results of operations.

Contractual Obligations

The following table summarizes our known contractual obligations (in thousands) as of June 30, 2014:

	Payments Due by Period
Contractual Obligations (1)	2014 (remaining six months)		2015		2016		2017		2018		Thereafter		Total
Operating lease obligations	$	947	$	1,787	$	1,717	$	1,408	$	801	$	66	$	6,726

(1) The contractual obligation table above excludes liabilities for uncertain tax positions of $2.8 million, which are not practicable to assign to any particular years, due to the inherent uncertainty of the tax positions.  See Note 6 of “Notes to Consolidated Financial Statements” for further discussion.

25

Item 3. Quantitative and Qualitative Disclosures About Market Risk

The following discusses our exposure to market risk related to changes in interest rates and foreign currency exchange rates. We do not currently own any equity investments, nor do we expect to own any in the foreseeable future. This discussion contains forward-looking statements that are subject to risks and uncertainties. Actual results could vary materially as a result of a number of factors.

Interest Rate Risk.   As of June 30, 2014, we had cash and cash equivalents of $106.9 million. Cash and cash equivalents consisted of cash and highly liquid money market instruments. We would not expect our operating results or cash flows to be affected to any significant degree by the effect of a sudden change in market interest on our portfolio. A hypothetical increase in market interest rates of 100 basis points from the market rates in effect at June 30, 2014, would cause the fair value of these investments to decrease by an immaterial amount which would not have significantly impacted our financial position or results of operations. Declines in interest rates over time will result in lower interest income and interest expense.

Foreign Currency and Exchange Risk.   Certain of our payables for our international offices are denominated in the local currency, including the Euro, Yen and RMB. Therefore, a portion of our operating expenditures is subject to foreign currency risks. We enter into foreign currency forward contracts to reduce the exposure to foreign currency exchange rate fluctuations on certain foreign currency denominated monetary assets and liabilities. We do not use foreign currency forward contracts for speculative or trading purposes. We record these forward contracts at fair value. The counterparty to these foreign currency forward contracts is a large global financial institution that we believe is creditworthy, and therefore, we believe the credit risk of counterparty non-performance is not significant. 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 foreign currency denominated monetary assets and liabilities, which is also recorded in other income (expense), net. As of June 30, 2014, we had one outstanding forward contract with a notional amount of $7.2 million. The foreign currency exchange rate movement of plus-or-minus 10% will result in the change in fair value of this contract of plus-or-minus $0.7 million.

Item 4. Controls and Procedures

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our principal executive officer and principal financial and accounting officer, evaluated the effectiveness of our "disclosure controls and procedures" as defined in Exchange Act Rules 13a-15(e) and 15d-15(e) as of June 30, 2014, in connection with the filing of this Quarterly Report on Form 10-Q. Based on that evaluation as of June 30, 2014, our principal executive officer and principal financial and accounting officer concluded that our disclosure controls and procedures were effective to ensure that information we are required to disclose in reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in rules and forms of the SEC and accumulated and communicated to our management as appropriate to allow timely decisions regarding required disclosure.

 Changes in Internal Control over Financial Reporting

There were no changes in the Company's internal control over financial reporting during the three months ended June 30, 2014, that have materially affected, or are reasonably likely to materially affect, the Company's internal control over financial reporting.

26

PART II — OTHER INFORMATION

Item 1. Legal Proceedings

From time to time, we are subject to various claims and legal proceedings that arise in the ordinary course of business. We accrue for losses related to litigation when a potential loss is probable and the loss can be reasonably estimated in accordance with FASB requirements. During the reported period, we were not party to any material legal proceedings, thus no loss was probable and no amount was accrued at June 30, 2014.

Item 1A. Risk Factors

Item 1A,“Risk Factors,” on pages 11 through 17 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2013, provides information on the significant risks associated with our business. There have been no subsequent material changes to these risks.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

The table below sets forth the information with respect to purchases made by or on behalf of the Company or any “affiliated purchaser” (as the term is defined in Rule 10b-18(a)(3) under the Securities Exchange Act of 1934) of our common stock during the three months June 30, 2014 (in thousands except per share amounts):

ISSUER PURCHASES OF EQUITY SECURITIES

Period	Total Number of Shares Purchased (1)		Average Price Paid Per Share		Total Number of Shares Purchased as Part of Publicly Announced Programs (1)		Approximate Dollar Value of Shares that May Yet Be Purchased Under Programs(1)
Month #4 (April 1, 2014 through April 30, 2014)		—	$	—		—	$	16,392
Month #5 (May 1, 2014 through May 31, 2014)		24	$	18.11		24	$	15,956
Month #6 (June 1, 2014 through June 30, 2014)		—	$	—		—	$	15,956
Total		24	$	18.11		24

(1) On November 8, 2012, the Board of Directors adopted a 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 June 30, 2014, 230,311 shares had been repurchased at the average price of $17.56 per share under this new program, a total purchase price of $4.0 million and $16.0 million remained for future repurchases.

Item 3. Defaults Upon Senior Securities

None.

 Item 4. Mine Safety Disclosures

None.

Item 5. Other Information

None.

27

Item 6. Exhibits

Exhibit Number	Description
10.12	PDF Solutions, Inc.'s Second Amended and Restated 2011 Stock Incentive Plan, filed as Appendix A to the Company's Proxy Statement dated April 15, 2014 and incorporated herein by reference.
31.01	Certification of the principal executive officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.02	Certification of the principal financial and accounting officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.01	Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.02	Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS	XBRL Instance Document.
101.SCH	XBRL Taxonomy Extension Schema Document.
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document.
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document.
101.LAB	XBRL Taxonomy Extension Label Linkbase Document.
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document.

28

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	PDF SOLUTIONS, INC.
Date: August 6, 2014	By:	/s/ JOHN K. KIBARIAN
		John K. Kibarian
		President and Chief Executive Officer
		(principal executive officer)

Date: August 6, 2014	By:	/s/ GREGORY C. WALKER
		Gregory C. Walker
		Vice President, Finance and Chief Financial Officer
		(principal financial and accounting officer)

29

INDEX TO EXHIBITS

Exhibit Number	Description
10.12	PDF Solutions, Inc.'s Second Amended and Restated 2011 Stock Incentive Plan, filed as Appendix A to the Company's Proxy Statement dated April 15, 2014 and incorporated herein by reference.
31.01	Certification of the principal executive officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.02	Certification of the principal financial and accounting officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.01	Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.02	Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS	XBRL Instance Document.
101.SCH	XBRL Taxonomy Extension Schema Document.
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document.
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document.
101.LAB	XBRL Taxonomy Extension Label Linkbase Document.
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document.

 30

EX-31

Exhibit 31.01

CERTIFICATIONS

 I, John K. Kibarian, certify that:

1. I have reviewed this quarterly report on Form 10-Q of PDF Solutions, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

By:	/s/ JOHN K. KIBARIAN
	John K. Kibarian
	President and Chief Executive Officer
	(principal executive officer)

Date: August 6, 2014

EX-31

Exhibit 31.02

CERTIFICATIONS

I, Gregory C. Walker, certify that:

1. I have reviewed this quarterly report on Form 10-Q of PDF Solutions, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

By:	/s/ GREGORY C. WALKER
	Gregory C. Walker
	Vice President, Finance and Chief Financial Officer
	(principal financial and accounting officer)

Date: August 6, 2014

EX-32

Exhibit 32.01

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of PDF Solutions, Inc. (the “Company”) on Form 10-Q for the quarter ended June 30, 2014, as filed with the Securities and Exchange Commission on August 6, 2014 (the “Report”), I, John K. Kibarian, President and Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

By:	/s/ JOHN K. KIBARIAN
	John K. Kibarian
	President and Chief Executive Officer
	(principal executive officer)

Date: August 6, 2014

EX-32

Exhibit 32.02

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of PDF Solutions, Inc. (the “Company”) on Form 10-Q for the quarter ended June 30, 2014 as filed with the Securities and Exchange Commission on August 6, 2014 (the “Report”), I, Gregory C. Walker, Vice President, Finance and Chief Financial Officer, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

By:	/s/ GREGORY C. WALKER
	Gregory C. Walker
	Vice President, Finance and Chief Financial Officer
	(principal financial and accounting officer)

Date: August 6, 2014

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Note 8 - Customer and Geographic Information (Details) - Receivables Percentage by Major Customers	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Customer A [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Note 8 - Customer and Geographic Information (Details) - Receivables Percentage by Major Customers [Line Items]
Accounts Receivable Percentage by Major Customers	45.00%	36.00%
Customer B [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Note 8 - Customer and Geographic Information (Details) - Receivables Percentage by Major Customers [Line Items]
Accounts Receivable Percentage by Major Customers	21.00%	17.00%
Customer C [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Note 8 - Customer and Geographic Information (Details) - Receivables Percentage by Major Customers [Line Items]
Accounts Receivable Percentage by Major Customers	11.00%	23.00%
Accounts Receivable [Member]
Note 8 - Customer and Geographic Information (Details) - Receivables Percentage by Major Customers [Line Items]
Accounts Receivable Percentage by Major Customers	10.00%
Customer Concentration Risk [Member]
Note 8 - Customer and Geographic Information (Details) - Receivables Percentage by Major Customers [Line Items]
Accounts Receivable Percentage by Major Customers	10.00%

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Note 5 - Restructuring (Details) - Summary of Restructuring Liabilities (USD $)	3 Months Ended		6 Months Ended							3 Months Ended	6 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2014 October 2012 Plan [Member]	Dec. 31, 2013 October 2012 Plan [Member]	Jun. 30, 2013 October 2012 Plan [Member]	Mar. 31, 2013 October 2012 Plan [Member]	Dec. 31, 2012 October 2012 Plan [Member]	Jun. 30, 2013 October 2008 Plan [Member]	Jun. 30, 2013 October 2008 Plan [Member]	Jun. 30, 2014 October 2012 Plan [Member]	Jun. 30, 2013 October 2012 Plan [Member]	Jun. 30, 2014 October 2012 Plan [Member]	Jun. 30, 2013 October 2012 Plan [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance					$ 62,000	$ 13,000	$ 66,000	$ 210,000	$ 896,000	$ 224,000	$ 448,000
Restructuring credits/charges	0	(9,000)	(57,000)	43,000							(102,000)		9,000	57,000	59,000
Adjustments										3,000	3,000
Payments										(122,000)	(244,000)	(62,000)	(153,000)	(70,000)	(889,000)
Ending balance	$ 0		$ 0		$ 62,000	$ 13,000	$ 66,000	$ 210,000	$ 896,000	$ 105,000	$ 105,000

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Note 3 - Balance Sheet Components (Details) - Property and Equipment (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Property and equipment, net:
Property and Equipment	$ 23,193	$ 21,545
Less: accumulated depreciation	(14,496)	(14,481)
Total	8,497	7,064
Computer Equipment [Member]
Property and equipment, net:
Property and Equipment	10,044	9,969
Software and Software Development Costs [Member]
Property and equipment, net:
Property and Equipment	3,428	3,441
Furniture and Fixtures [Member]
Property and equipment, net:
Property and Equipment	739	734
Leasehold Improvements [Member]
Property and equipment, net:
Property and Equipment	1,129	1,052
Equipment [Member]
Property and equipment, net:
Property and Equipment	5,682	4,928
Construction in Progress [Member]
Property and equipment, net:
Property and Equipment	$ 2,171	$ 1,421

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Note 9 - Fair Value Measurements (Details) (Foreign Exchange Contract [Member], USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014
Note 9 - Fair Value Measurements (Details) [Line Items]
Derivative, Number of Instruments Held	1	1
Derivative Asset, Notional Amount	$ 7,200,000	$ 7,200,000
Other Income Expense [Member]
Note 9 - Fair Value Measurements (Details) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(100,000)	(100,000)
Other Current Assets [Member]
Note 9 - Fair Value Measurements (Details) [Line Items]
Derivative Asset, Current	$ 23,000	$ 23,000

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Note 8 - Customer and Geographic Information (Details)	6 Months Ended
	Jun. 30, 2014
Note 8 - Customer and Geographic Information (Details) [Line Items]
Number of Operating Segments	1
Accounts Receivable [Member]
Note 8 - Customer and Geographic Information (Details) [Line Items]
Concentration Risk, Percentage	10.00%
Customer Concentration Risk [Member]
Note 8 - Customer and Geographic Information (Details) [Line Items]
Concentration Risk, Percentage	10.00%

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Note 4 - Stockholders' Equity

6 Months Ended

Jun. 30, 2014

Disclosure Text Block Supplement [Abstract]

Shareholders' Equity and Share-based Payments [Text Block]

4. STOCKHOLDERS’ EQUITY

Stock-based compensation is estimated at the grant date based on the award’s fair value and is recognized on a straight-line basis over the vesting periods, generally four years. Stock-based compensation expenses before taxes related to the Company’s stock plans and employee stock purchase plan were allocated as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2014		2013		2014		2013
Cost of design-to-silicon yield-solutions	$	797	$	649	$	1,520	$	1,183
Research and development		434		337		805		659
Selling, general and administrative		1,143		723		1,709		1,176
Stock-based compensation expenses	$	2,374	$	1,709	$	4,034	$	3,018

On June 30, 2014, the Company has in effect the following stock-based compensation plans:

Stock Plans — At the annual meeting of stockholders on November 16, 2011, the Company’s stockholders approved the 2011 Stock Incentive Plan, which was first 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 and then subsequently amended at the 2014 annual meeting of stockholders on May 27, 2014, when the Company’s stockholders approved the Second Amended and Restated 2011 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 6,550,000 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.

The Company estimated the fair value of share-based awards granted under the Stock 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:

	Three Months Ended June 30,						Six Months Ended June 30,
	2014			2013			2014			2013
Expected life (in years)		4.58			4.78			4.58			4.78
Volatility		42.3	%		55.0	%		42.7	%		56.1	%
Risk-free interest rate		1.47	%		1.33	%		1.50	%		0.93	%
Expected dividend		—			—			—			—
Weighted average fair value per share of options granted during the period	$	7.15		$	8.50		$	7.39		$	7.77

As of June 30, 2014, 7.0 million shares of common stock were reserved to cover stock-based awards under the 2011 Plan, of which 3.9 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 June 30, 2014.  As of June 30, 2014, there were no outstanding awards that had been granted outside of the 2011, 2001 or the IDS Plans (collectively, the "Stock Plans"). 

Stock option activity under the Company’s Stock Plans during the six months ended June 30, 2014, was as follows:

	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, 2014		2,880		$	7.35
Granted (weighted average fair value of $7.39 per share)		12		$	19.72
Exercised		(371	)	$	6.46
Canceled		(16	)	$	9.87
Expired		(6	)	$	5.91
Outstanding, June 30, 2014		2,499		$	7.53		6.22	$	34,219
Vested and expected to vest, June 30, 2014		2,455		$	7.50		6.19	$	33,704
Exercisable, June 30, 2014		1,751		$	7.01		5.58	$	24,871

The aggregate intrinsic value in the table above represents the total intrinsic value based on the Company’s closing stock price of $21.22 per share as of June 30, 2014. The total intrinsic value of options exercised during the six months ended June 30, 2014, was $5.0 million.

As of June 30, 2014, there was $3.1 million of total unrecognized compensation cost related to unvested stock options. That cost is expected to be recognized over a weighted average period of 1.7 years. The total fair value of shares vested during the six months ended June 30, 2014, was $1.2 million.

Nonvested restricted stock units activity during the six months ended June 30, 2014, was as follows:

	Shares (in thousands)			Weighted Average Grant Date Fair Value Per Share
Nonvested, January 1, 2014		759		$	14.44
Granted		551		$	19.53
Vested		(164	)	$	13.81
Forfeited		(7	)	$	17.86
Nonvested, June 30, 2014		1,139		$	17.02

As of June 30, 2014, there was $16.7 million of total unrecognized compensation cost related to nonvested restricted stock units. That cost is expected to be recognized over a weighted average period of 3.1 years.   

Employee Stock Purchase Plan — In July 2001, the Company adopted a ten-year Employee Stock Purchase Plan (as amended, “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. 

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,
	2014			2013
Expected life (in years)		1.25			1.25
Volatility		34.6	%		46.1	%
Risk-free interest rate		0.18	%		0.19	%
Expected dividend		—			—
Weighted average fair value of purchase rights granted under the Purchase Plan	$	7.18		$	5.28

During the three months ended June 30, 2014 and 2013, the Company did not issue any shares under the Purchase Plan. During the six months ended June 30, 2014 and 2013, a total of 52,000 and 104,000 shares, respectively, were issued at a weighted-average purchase price of $12.10 and $5.24 per share, respectively, under the Purchase Plan. For the three-month periods ended June 30, 2014 and 2013, the Purchase Plan compensation expense was $0.1 million and $0.2 million, respectively. For the six months ended June 30, 2014 and 2013, the Purchase Plan compensation expense was $0.3 million and $0.4 million, respectively. As of June 30, 2014, there was $0.4 million of unrecognized compensation cost related to the Purchase Plan. That cost is expected to be recognized over a weighted average period of 1.0 years. As of June 30, 2014, 1.2 million shares were available for future issuance under the Purchase Plan.

Stock Repurchase Program — On November 8, 2012, the Board of Directors adopted a 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 June 30, 2014, 230,311 shares had been repurchased at the average price of $17.56 per share under this new program, at a total purchase of $4.0 million, and $16.0 million remained available for future repurchases.

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Note 9 - Fair Value Measurements (Details) - Fair Value, Assets Measured on Recurring Basis (Money Market Mutual Funds [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Note 9 - Fair Value Measurements (Details) - Fair Value, Assets Measured on Recurring Basis [Line Items]
Assets at fair value	$ 26,354	$ 26,353
Fair Value, Inputs, Level 1 [Member]
Note 9 - Fair Value Measurements (Details) - Fair Value, Assets Measured on Recurring Basis [Line Items]
Assets at fair value	$ 26,354	$ 26,353

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Note 4 - Stockholders' Equity (Details) - Stock Options Activity (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Stock Options Activity [Abstract]
Outstanding - Number of Options	2,499	2,880
Outstanding - Weighted Average Exercise Price per Share	$ 7.53	$ 7.35
Outstanding - Weighted Average Remaining Contractual Term	6 years 80 days
Outstanding - Aggregate Intrinsic Value	$ 34,219
Vested and expected to vest, June 30, 2014	2,455
Vested and expected to vest, June 30, 2014	$ 7.50
Vested and expected to vest, June 30, 2014	6 years 69 days
Vested and expected to vest, June 30, 2014	33,704
Exercisable, June 30, 2014	1,751
Exercisable, June 30, 2014	$ 7.01
Exercisable, June 30, 2014	5 years 211 days
Exercisable, June 30, 2014	$ 24,871
Granted (weighted average fair value of $7.39 per share)	12
Granted (weighted average fair value of $7.39 per share)	$ 19.72
Exercised	(371)
Exercised	$ 6.46
Canceled	(16)
Canceled	$ 9.87
Expired	(6)
Expired	$ 5.91

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Note 4 - Stockholders' Equity (Details) - Stock Options, Valuation Assumptions (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Note 4 - Stockholders' Equity (Details) - Stock Options, Valuation Assumptions [Line Items]
Weighted average fair value per share of options granted during the period (in Dollars per share)			$ 7.39
Employee Stock Option [Member]
Note 4 - Stockholders' Equity (Details) - Stock Options, Valuation Assumptions [Line Items]
Expected life (in years)	4 years 211 days	4 years 284 days	4 years 211 days	4 years 284 days
Volatility	42.30%	55.00%	42.70%	56.10%
Risk-free interest rate	1.47%	1.33%	1.50%	0.93%
Weighted average fair value per share of options granted during the period (in Dollars per share)	$ 7.15	$ 8.50	$ 7.39	$ 7.77
Employee Stock Purchase Plan [Member]
Note 4 - Stockholders' Equity (Details) - Stock Options, Valuation Assumptions [Line Items]
Expected life (in years)			1 year 3 months	1 year 3 months
Volatility			34.60%	46.10%
Risk-free interest rate			0.18%	0.19%
Weighted average fair value per share of options granted during the period (in Dollars per share)			$ 7.18	$ 5.28

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Note 10 - Commitments and Contingencies (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Commitments and Contingencies Disclosure [Abstract]
Operating Leases, Rent Expense, Net	$ 500,000	$ 500,000	$ 1,000,000	$ 1,000,000
Loss Contingency, Loss in Period				0
Loss Contingency Accrual		$ 0		$ 0

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Note 4 - Stockholders' Equity (Details) - Stock Options Activity (Parentheticals) (USD $)	6 Months Ended
	Jun. 30, 2014
Stock Options Activity [Abstract]
Granted, weighted average fair value	$ 7.39

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Note 4 - Stockholders' Equity (Details) - Nonvested Restricted Stock Units Activity (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Dec. 30, 2013
Nonvested Restricted Stock Units Activity [Abstract]
Nonvested, January 1, 2014		759
Nonvested, January 1, 2014		$ 14.44
Granted	551
Granted	$ 19.53
Vested	(164)
Vested	$ 13.81
Forfeited	(7)
Forfeited	$ 17.86
Nonvested, June 30, 2014	1,139	759
Nonvested, June 30, 2014	$ 17.02	$ 14.44

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Note 3 - Balance Sheet Components

6 Months Ended

Jun. 30, 2014

Disclosure Text Block Supplement [Abstract]

Supplemental Balance Sheet Disclosures [Text Block]

3. BALANCE SHEET COMPONENTS

Accounts receivable include amounts that are unbilled at the end of the period. Unbilled accounts receivable are determined on an individual contract basis and were $10.2 million and $8.0 million as of June 30, 2014, and December 31, 2013, respectively.

Property and equipment consists of (in thousands): 

	June 30, 2014			December 31, 2013
Property and equipment, net:
Computer equipment	$	10,044		$	9,969
Software		3,428			3,441
Furniture, fixtures and equipment		739			734
Leasehold improvements		1,129			1,052
Test equipment		5,682			4,928
Construction-in-progress		2,171			1,421
		23,193			21,545
Less: accumulated depreciation		(14,496	)		(14,481	)
Total	$	8,497		$	7,064

Depreciation and amortization expense was $0.5 million and $0.3 million for the three months ended June 30, 2014 and 2013, respectively. Depreciation and amortization expense was $0.9 million and $0.6 million for the six months ended June 30, 2014 and 2013, respectively.

Intangible assets balance was zero and $31,000 as of June 30, 2014, and December 31, 2013, respectively. The balance was included in other non-current assets in the accompanying condensed consolidated balance sheets. For the three-months ended June 30, 2014 and 2013, intangible asset amortization expense was $12,000 and $19,000, respectively. For the six months ended June 30, 2014 and 2013, intangible asset amortization expense was $30,000 and $37,000, respectively.

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Note 5 - Restructuring (Details) (USD $)	3 Months Ended		6 Months Ended											6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Employee Severance [Member] October 2012 Plan [Member]	Jun. 30, 2014 Employee Severance [Member] October 2008 Plan [Member]	Jun. 30, 2014 Facility Closing [Member] October 2008 Plan [Member]	Jun. 30, 2014 October 2012 Plan [Member]	Mar. 31, 2014 October 2012 Plan [Member]	Dec. 31, 2013 October 2012 Plan [Member]	Jun. 30, 2013 October 2012 Plan [Member]	Mar. 31, 2013 October 2012 Plan [Member]	Dec. 31, 2012 October 2012 Plan [Member]	Jun. 30, 2013 October 2008 Plan [Member]	Jun. 30, 2014 October 2008 Plan [Member]	Mar. 31, 2013 October 2008 Plan [Member]	Dec. 31, 2012 October 2008 Plan [Member]
Note 5 - Restructuring (Details) [Line Items]
Restructuring Charges	$ 0	$ 9,000	$ 57,000	$ (43,000)										$ 102,000
Restructuring Reserve	0		0						62,000	13,000	66,000	210,000	896,000	105,000		224,000	448,000
Restructuring and Related Cost, Cost Incurred to Date					$ 2,100,000	$ 4,700,000	$ 2,700,000	$ 2,200,000							$ 7,400,000

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Note 8 - Customer and Geographic Information (Details) - Revenue by Geographical Areas (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Note 8 - Customer and Geographic Information (Details) - Revenue by Geographical Areas [Line Items]
Revenues	$ 24,610	$ 24,776	$ 51,696	$ 48,886
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member] | North America [Member]
Note 8 - Customer and Geographic Information (Details) - Revenue by Geographical Areas [Line Items]
Revenues	10,158	10,816	21,558	20,682
Concentration Risk Percentage	41.00%	44.00%	42.00%	42.00%
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member] | GERMANY
Note 8 - Customer and Geographic Information (Details) - Revenue by Geographical Areas [Line Items]
Revenues	9,034	5,241	18,134	9,866
Concentration Risk Percentage	37.00%	21.00%	35.00%	20.00%
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member] | KOREA, REPUBLIC OF
Note 8 - Customer and Geographic Information (Details) - Revenue by Geographical Areas [Line Items]
Revenues	1,242	3,631	3,502	8,544
Concentration Risk Percentage	5.00%	15.00%	7.00%	18.00%
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member] | JAPAN
Note 8 - Customer and Geographic Information (Details) - Revenue by Geographical Areas [Line Items]
Revenues	1,216	1,961	2,929	4,222
Concentration Risk Percentage	5.00%	8.00%	6.00%	9.00%
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member] | Rest of Asia [Member]
Note 8 - Customer and Geographic Information (Details) - Revenue by Geographical Areas [Line Items]
Revenues	1,223	2,098	2,717	3,642
Concentration Risk Percentage	5.00%	8.00%	5.00%	7.00%
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member] | Rest of Europe [Member]
Note 8 - Customer and Geographic Information (Details) - Revenue by Geographical Areas [Line Items]
Revenues	1,737	1,029	2,856	1,930
Concentration Risk Percentage	7.00%	4.00%	5.00%	4.00%
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member]
Note 8 - Customer and Geographic Information (Details) - Revenue by Geographical Areas [Line Items]
Revenues	$ 24,610	$ 24,776	$ 51,696	$ 48,886
Concentration Risk Percentage	100.00%	100.00%	100.00%	100.00%

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Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 106,909	$ 89,371
Accounts receivable, net of allowance of $327 and $354, respectively	30,705	34,860
Deferred tax assets - current portion	4,181	5,920
Prepaid expenses and other current assets	5,321	3,632
Total current assets	147,116	133,783
Property and equipment, net	8,497	7,064
Deferred tax assets - non-current portion	8,196	8,599
Other non-current assets	1,597	1,718
Total assets	165,406	151,164
Current liabilities:
Accounts payable	933	1,129
Accrued compensation and related benefits	6,024	7,707
Accrued and other current liabilities	1,668	1,593
Deferred revenues	3,442	2,096
Billings in excess of recognized revenues	128	343
Total current liabilities	12,195	12,868
Non-current liabilities	3,409	3,584
Total liabilities	15,604	16,452
Commitments and contingencies (Note 10)
Stockholders’ equity:
Preferred stock, $0.00015 par value, 5,000 shares authorized, no shares issued and outstanding	0	0
Common stock, $0.00015 par value, 70,000 shares authorized: shares issued 35,873 and 35,285, respectively; shares outstanding 30,786 and 30,437, respectively	5	5
Additional paid-in-capital	242,514	233,813
Treasury stock at cost, 5,087 and 4,848 shares, respectively	(33,326)	(28,905)
Accumulated deficit	(59,698)	(70,649)
Accumulated other comprehensive income	307	448
Total stockholders’ equity	149,802	134,712
Total liabilities and stockholders’ equity	$ 165,406	$ 151,164

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Note 10 - Commitments and Contingencies (Details) - Future Minimum Lease Payments Under Noncancelable Operating Leases (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014
Future Minimum Lease Payments Under Noncancelable Operating Leases [Abstract]
2014 (remaining six months)	$ 947
2015	1,787
2016	1,717
2017	1,408
2018	801
Thereafter	66
Total future minimum lease payments	$ 6,726

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Note 1 - Basis of Presentation

6 Months Ended

Jun. 30, 2014

Disclosure Text Block [Abstract]

Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]

1. BASIS OF PRESENTATION

Basis of Presentation

The interim unaudited condensed consolidated financial statements included herein have been prepared by PDF Solutions, Inc. (“the Company”) pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”), including the instructions to the Quarterly Report on Form 10-Q and Article 10 of Regulation S-X. Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted. The interim unaudited condensed consolidated financial statements reflect, in the opinion of management, all adjustments necessary (consisting only of normal recurring adjustments), to present a fair statement of results for the interim periods presented. The operating results for any interim period are not necessarily indicative of the results that may be expected for other interim periods or the full fiscal year. The accompanying interim unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto in the Company’s Annual Report on Form 10-K for the year ended December 31, 2013.

The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries after the elimination of all significant intercompany balances and transactions.

The condensed consolidated balance sheet at December 31, 2013, has been derived from the audited consolidated financial statements but does not include all disclosures required by accounting principles generally accepted in the United States of America.

Use of Estimates  —  The preparation of financial statements in conformity with generally accepted accounting principles in the United States (“U.S. GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Significant estimates in these financial statements include 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.

Revenue Recognition  — The Company derives revenue from two sources: Design-to-silicon-yield solutions and Gainshare performance incentives.

Design-to-Silicon-Yield Solutions — Revenue that is derived from Design-to-silicon-yield solutions comes from services and software licenses. The Company recognizes revenue of Design-to-silicon-yield solutions as follows:

The Company generates a significant portion of its Design-to-silicon-yield solutions revenue from fixed-price solution implementation service contracts delivered over a specific period of time. These contracts require reliable estimation of costs to perform obligations and the overall scope of each engagement. Revenue under project–based contracts for solution implementation services is recognized as services are performed using the cost-to-cost percentage of completion method of contract accounting. Losses on fixed-price solution implementation contracts are recognized in the period when they become probable. Revisions in profit estimates are reflected in the period in which the conditions that require the revisions become known and can be estimated. Revenue under time and materials contracts for solution implementation services are recognized as the services are performed. On occasion, the Company licenses its software products as a component of its fixed-price service contracts. In such instances, the software products are licensed to customers over a specified term of the agreement with support and maintenance to be provided at each customer's option over the license term. The amount of product and service revenue recognized in a given period is affected by the Company’s judgment as to whether an arrangement includes multiple deliverables and, if so, the Company’s determination of the fair value of each deliverable. In general, vendor-specific objective evidence of selling price (“VSOE”) does not exist for the Company’s solution implementation services and software products and because the Company’s services and products include our unique technology, the Company is not able to determine third-party evidence of selling price (“TPE”). Therefore, in such circumstances the Company uses best estimated selling prices (“BESP”) in the allocation of arrangement consideration. In determining BESP, the Company applies significant judgment as the Company’s weighs a variety of factors, based on the facts and circumstances of the arrangement. The Company typically arrives at BESP for a product or service that is not sold separately by considering company-specific factors such as geographies, internal costs, gross margin objectives, pricing practices used to establish bundled pricing, and existing portfolio pricing and discounting. After fair value is established for each deliverable, the total transaction amount is allocated to each deliverable based upon its relative fair value. Fees allocated to solution implementation services are recognized using the cost-to-cost percentage of completion method of contract accounting. Fees allocated to software and related support and maintenance are recognized under software revenue recognition guidance. 

 The Company also licenses its software products separately from its solution implementations. For software license arrangements that do not require significant modification or customization of the underlying software, software license revenue is recognized under the residual method when (1) persuasive evidence of an arrangement exists, (2) delivery has occurred, (3) the fee is fixed or determinable, (4) collectability is probable, and (5) the arrangement does not require services that are essential to the functionality of the software. When arrangements include multiple elements such as support and maintenance, consulting (other than for its fixed price solution implementations), installation, and training, revenue is allocated to each element of a transaction based upon its fair value as determined by the Company’s VSOE and such services are recorded as services revenue. VSOE for maintenance is generally established based upon negotiated renewal rates while VSOE for consulting, installation, and training services is established based upon the Company’s customary pricing for such services when sold separately. Revenue for software licenses with extended payment terms is not recognized in excess of amounts due. For software license arrangements that require significant modification or customization of the underlying software, the software license revenue is recognized as services are performed using the cost-to-cost percentage of completion method of contract accounting, and such revenue is recorded as services revenue.

Gainshare Performance Incentives  — When the Company enters into a contract to provide yield improvement services, the contract usually includes two components: (1) a fixed fee for performance by the Company of services delivered over a specific period of time; and (2) a Gainshare performance incentive component where the customer may pay a contingent variable fee, usually after the fixed fee period has ended. Revenue derived from Gainshare performance incentives represents profit sharing and performance incentives earned contingent upon the Company’s customers reaching certain defined operational levels established in related solution implementation service contracts. Gainshare performance incentives periods are usually subsequent to the delivery of all contractual services and therefore have no cost to the Company. Due to the uncertainties surrounding attainment of such operational levels, the Company recognizes Gainshare performance incentives revenue (to the extent of completion of the related solution implementation contract) upon receipt of performance reports or other related information from the customer supporting the determination of amounts and probability of collection.

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Note 7 - Net Income Per Share (Details) - Calculation of Earnings Per Share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Numerator:
Net income (in Dollars)	$ 4,696	$ 4,552	$ 10,951	$ 9,283
Denominator:
Basic weighted average common shares outstanding	30,590	29,650	30,533	29,501
Dilutive effect of equity incentive plans	1,292	1,504	1,390	1,484
Diluted weighted average common shares outstanding	31,882	31,154	31,923	30,985
Net income per share:
Basic (in Dollars per share)	$ 0.15	$ 0.15	$ 0.36	$ 0.31
Diluted (in Dollars per share)	$ 0.15	$ 0.15	$ 0.34	$ 0.30

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Note 9 - Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2014

Fair Value Disclosures [Abstract]

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	$	26,354	$	26,354	$	—	$	—

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	$	26,353	$	26,353	$	—	$	—

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Note 7 - Net Income Per Share (Details) - Antidilutive Securities In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities	268	286	70	198
Equity Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities	52	112	22	110
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities	173	174	2	88
Employee Stock Purchase Plan [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities	43		46

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Note 3 - Balance Sheet Components (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Disclosure Text Block Supplement [Abstract]
Unbilled Receivables, Current	$ 10,200,000		$ 10,200,000		$ 8,000,000
Depreciation, Depletion and Amortization, Nonproduction	500,000	300,000	900,000	600,000
Intangible Assets, Net (Excluding Goodwill)	0		0		31,000
Amortization of Intangible Assets	$ 12,000	$ 19,000	$ 30,000	$ 37,000

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Note 2 - Recent Accounting Pronouncements

6 Months Ended

Jun. 30, 2014

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

New Accounting Pronouncements and Changes in Accounting Principles [Text Block]

 2. RECENT ACCOUNTING PRONOUNCEMENTS

In May 2014, the Financial Accounting Standards Board ("FASB") issued new accounting guidance related to revenue recognition. The core principle is that a company should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration for which the entity expects to be entitled in exchange for those goods or services. The updated standard will replace most existing revenue recognition guidance under GAAP when it becomes effective and permits the use of either the retrospective or cumulative effect transition method. Early adoption is not permitted. The updated standard will be effective for the Company beginning January 1, 2017 and can be applied either retrospectively to each period presented or as a cumulative-effect adjustment as of the date of adoption. The Company has not yet selected a transition method and is currently evaluating the impact of adopting this new accounting standard on its financial statements.

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Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $) In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Accounts receivable, allowances (in Dollars)	$ 327	$ 354
Preferred stock, par value (in Dollars per share)	$ 0.00015	$ 0.00015
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)	$ 0.00015	$ 0.00015
Common stock, shares authorized	70,000	70,000
Common stock, shares issued	35,873	35,285
Common stock, shares outstanding	30,786	30,437
Treasury stock shares	5,087	4,848

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Note 3 - Balance Sheet Components (Tables)

6 Months Ended

Jun. 30, 2014

Disclosure Text Block Supplement [Abstract]

Property, Plant and Equipment [Table Text Block]

	June 30, 2014			December 31, 2013
Property and equipment, net:
Computer equipment	$	10,044		$	9,969
Software		3,428			3,441
Furniture, fixtures and equipment		739			734
Leasehold improvements		1,129			1,052
Test equipment		5,682			4,928
Construction-in-progress		2,171			1,421
		23,193			21,545
Less: accumulated depreciation		(14,496	)		(14,481	)
Total	$	8,497		$	7,064

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Document And Entity Information	6 Months Ended
	Jun. 30, 2014	Aug. 01, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	PDF SOLUTIONS INC
Document Type	10-Q
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		30,854,866
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	Jun. 30, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q2

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Note 4 - Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2014

Disclosure Text Block Supplement [Abstract]

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,
	2014		2013		2014		2013
Cost of design-to-silicon yield-solutions	$	797	$	649	$	1,520	$	1,183
Research and development		434		337		805		659
Selling, general and administrative		1,143		723		1,709		1,176
Stock-based compensation expenses	$	2,374	$	1,709	$	4,034	$	3,018

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Three Months Ended June 30,						Six Months Ended June 30,
	2014			2013			2014			2013
Expected life (in years)		4.58			4.78			4.58			4.78
Volatility		42.3	%		55.0	%		42.7	%		56.1	%
Risk-free interest rate		1.47	%		1.33	%		1.50	%		0.93	%
Expected dividend		—			—			—			—
Weighted average fair value per share of options granted during the period	$	7.15		$	8.50		$	7.39		$	7.77

	Six Months Ended June 30,
	2014			2013
Expected life (in years)		1.25			1.25
Volatility		34.6	%		46.1	%
Risk-free interest rate		0.18	%		0.19	%
Expected dividend		—			—
Weighted average fair value of purchase rights granted under the Purchase Plan	$	7.18		$	5.28

Schedule of 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, 2014		2,880		$	7.35
Granted (weighted average fair value of $7.39 per share)		12		$	19.72
Exercised		(371	)	$	6.46
Canceled		(16	)	$	9.87
Expired		(6	)	$	5.91
Outstanding, June 30, 2014		2,499		$	7.53		6.22	$	34,219
Vested and expected to vest, June 30, 2014		2,455		$	7.50		6.19	$	33,704
Exercisable, June 30, 2014		1,751		$	7.01		5.58	$	24,871

Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]

	Shares (in thousands)			Weighted Average Grant Date Fair Value Per Share
Nonvested, January 1, 2014		759		$	14.44
Granted		551		$	19.53
Vested		(164	)	$	13.81
Forfeited		(7	)	$	17.86
Nonvested, June 30, 2014		1,139		$	17.02

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Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues:
Design-to-silicon-yield solutions	$ 13,091,000	$ 14,950,000	$ 28,010,000	$ 29,798,000
Gainshare performance incentives	11,519,000	9,826,000	23,686,000	19,088,000
Total revenues	24,610,000	24,776,000	51,696,000	48,886,000
Cost of design-to-silicon-yield solutions	8,847,000	9,741,000	18,552,000	19,398,000
Gross profit	15,763,000	15,035,000	33,144,000	29,488,000
Operating expenses:
Research and development	3,337,000	3,184,000	6,933,000	6,548,000
Selling, general and administrative	4,661,000	4,404,000	8,990,000	9,198,000
Amortization of other acquired intangible assets	12,000	19,000	30,000	37,000
Restructuring charges (credits)	0	9,000	57,000	(43,000)
Total operating expenses	8,010,000	7,616,000	16,010,000	15,740,000
Income from operations	7,753,000	7,419,000	17,134,000	13,748,000
Interest and other income (expense), net	(27,000)	(76,000)	(114,000)	174,000
Income before income taxes	7,726,000	7,343,000	17,020,000	13,922,000
Income tax provision	3,030,000	2,791,000	6,069,000	4,639,000
Net income	4,696,000	4,552,000	10,951,000	9,283,000
Net income per share:
Basic (in Dollars per share)	$ 0.15	$ 0.15	$ 0.36	$ 0.31
Diluted (in Dollars per share)	$ 0.15	$ 0.15	$ 0.34	$ 0.30
Weighted average common shares:
Basic (in Shares)	30,590	29,650	30,533	29,501
Diluted (in Shares)	31,882	31,154	31,923	30,985
Net income	4,696,000	4,552,000	10,951,000	9,283,000
Other comprehensive income:
Foreign currency translation adjustments, net of tax	(89,000)	182,000	(141,000)	13,000
Comprehensive income	$ 4,607,000	$ 4,734,000	$ 10,810,000	$ 9,296,000

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Note 7 - Net Income Per Share

6 Months Ended

Jun. 30, 2014

Earnings Per Share [Abstract]

Earnings Per Share [Text Block]

7. NET INCOME PER SHARE

Basic net income per share is computed by dividing net income by weighted average number of common shares outstanding for the period (excluding outstanding stock options and shares subject to repurchase). Diluted net income per share is computed using the weighted-average number of common shares outstanding for the period plus the potential effect of dilutive securities which are convertible into common shares (using the treasury stock method), except in cases in which the effect would be anti-dilutive. Under the treasury stock method, the amount that the employee must pay for exercising stock options, the amount of compensation cost for future service that the Company has not yet recognized, and the amount of the tax benefits that would be recorded in additional paid-in capital when the award becomes deductible are assumed to be used to repurchase shares.  The following is a reconciliation of the numerators and denominators used in computing basic and diluted net income per share (in thousands except per share amount):

	Three Months Ended June 30,				Six Months Ended June 30,
	2014		2013		2014		2013
Numerator:
Net income	$	4,696	$	4,552	$	10,951	$	9,283
Denominator:
Basic weighted average common shares outstanding		30,590		29,650		30,533		29,501
Dilutive effect of equity incentive plans		1,292		1,504		1,390		1,484
Diluted weighted average common shares outstanding		31,882		31,154		31,923		30,985
Net income per share:
Basic	$	0.15	$	0.15	$	0.36	$	0.31
Diluted	$	0.15	$	0.15	$	0.34	$	0.30

The following table sets forth potential shares of common stock that are not included in the diluted net income per share calculation above because to do so would be anti-dilutive for the periods indicated (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2014		2013		2014		2013
Outstanding options		52		112		22		110
Nonvested restricted stock units		173		174		2		88
Employee Stock Purchase Plan		43		—		46		—
Total		268		286		70		198

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Note 6 - Income Taxes

6 Months Ended

Jun. 30, 2014

Income Tax Disclosure [Abstract]

Income Tax Disclosure [Text Block]

6. INCOME TAXES

Income tax provision increased $1.4 million for the six months ended June 30, 2014, to $6.1 million as compared to an income tax provision of $4.6 million for the six months ended June 30, 2013.  The Company’s effective tax rate was 35.66% and 33.32% for the six months ended June 30, 2014, and June 30, 2013, respectively.  The income tax provision for the six months ended June 30, 2014, was less than the provision at the statutory rate primarily due to changes in unrecognized tax benefits. The income tax provision for the six months ended June 30, 2013, was less than the provision at the statutory rate primarily due to the utilization of U.S. tax credits, offset by foreign withholding taxes, statutory taxes, and changes in unrecognized tax benefits.

On January 2, 2013, the President signed into law the American Taxpayer Relief Act which reinstated the U.S. Federal Research and Development tax credit retroactive to January 1, 2012, and extended the tax credit through December 31, 2013.  As a result of the new legislation, the Company recognized a benefit in the six months ended June 30, 2013 related to 12 months of fiscal 2012 as well as a benefit to the annual effective tax rate for the full year research tax credit for fiscal 2013, which amounted to $0.4 million. The expiration of the U.S Federal research tax credit resulted in zero tax credit for the six months ended June 30, 2014.

The Company’s total amount of unrecognized tax benefits, excluding interest and penalties, as of June 30, 2014, was $10.2 million, of which $6.2 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, 2013, was $10.2 million, of which $6.3 million, if recognized, would affect the Company's effective tax rate. As of June 30, 2014, the Company has recorded unrecognized tax benefits of $2.8 million, including interest and penalties, as long-term taxes payable in its condensed consolidated balance sheet. The remaining $7.8 million has been recorded net of our deferred tax assets, of which $4.0 million is subject to a full valuation allowance.

As of June 30, 2014, the Company believes that most of its deferred tax assets are “more likely than not” to be realized with the exception of California R&D tax credits that have not met the “more likely than not” realization threshold criteria because on an annual basis and pursuant to current law, the Company generates more California credits than California tax. As a result, at June 30, 2014, the excess California R&D tax credits continue to be subject to a full valuation allowance. In the event the Company concludes at a future financial reporting period that there has been a change in its ability to realize the California R&D credit deferred tax assets, and it is at such time no longer “more likely than not” that the Company will realize the tax credits before applicable expiration dates, the Company’s tax provision will increase in the period in which the Company makes such determination.

The Company conducts business globally and, as a result, files numerous consolidated and separate income tax returns in the U.S. federal, various state and foreign jurisdictions. Because the Company used some of the tax attributes carried forward from previous years to tax years that are still open, statutes of limitation remain open for all tax years to the extent of the attributes carried forward into tax year 2002 for federal and California tax purposes. The Company is not subject to income tax examinations in any other of its major foreign subsidiaries’ jurisdictions.

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Note 10 - Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2014

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

Year Ending December 31,	Amount
2014 (remaining six months)	$	947
2015		1,787
2016		1,717
2017		1,408
2018		801
Thereafter		66
Total future minimum lease payments	$	6,726

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Note 5 - Restructuring (Tables) (October 2008 Plan [Member])

6 Months Ended

Jun. 30, 2014

October 2008 Plan [Member]

Note 5 - Restructuring (Tables) [Line Items]

Restructuring and Related Costs [Table Text Block]

	Three Months Ended June 30,						Six Months Ended June 30,
	2014			2013			2014			2013
Beginning balance	$	62		$	210		$	13		$	896
Restructuring charges (credits)		—			9			57			59
Cash payments		(62	)		(153	)		(70	)		(889	)
Ending balance	$	—		$	66		$	—		$	66

	Three Months Ended June 30,					Six Months Ended June 30,
	2014		2013			2014		2013
Beginning balance	$	—	$	224		$	—	$	448
Restructuring charges (credits)		—		—			—		(102	)
Adjustments		—		3			—		3
Cash payments		—		(122	)		—		(244	)
Ending balance	$	—	$	105		$	—	$	105

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Note 10 - Commitments and Contingencies

6 Months Ended

Jun. 30, 2014

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies Disclosure [Text Block]

10. COMMITMENTS AND CONTINGENCIES

 Leases

The Company leases administrative and sales offices and certain equipment under noncancelable operating leases, which contain various renewal options and, in some cases, require payment of common area costs, taxes and utilities. These operating leases expire at various times through 2019. Rent expense was both $0.5 million for the three months ended June 30, 2014 and 2013. Rent expense was $1.0 million for both the six months ended June 30, 2014 and 2013.

Future minimum lease payments under noncancelable operating leases at June 30, 2014, are as follows (in thousands):

Year Ending December 31,	Amount
2014 (remaining six months)	$	947
2015		1,787
2016		1,717
2017		1,408
2018		801
Thereafter		66
Total future minimum lease payments	$	6,726

Litigation  — From time to time, the Company is subject to various claims and legal proceedings that arise in the ordinary course of business. The Company accrues for losses related to litigation when a potential loss is probable and the loss can be reasonably estimated in accordance with FASB requirements. During the reported period, the Company was not party to any material legal proceedings, thus no loss was probable and no amount was accrued at June 30, 2014. 

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Note 8 - Customer and Geographic Information

6 Months Ended

Jun. 30, 2014

Segment Reporting [Abstract]

Segment Reporting Disclosure [Text Block]

 8. CUSTOMER AND GEOGRAPHIC INFORMATION

Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision maker, or group, in deciding how to allocate resources and in assessing performance.

The Company’s chief operating decision maker, the chief executive officer, reviews discrete financial information presented on a consolidated basis for purposes of regularly making operating decisions and assessing financial performance. Accordingly, the Company considers itself to be in one operating segment, specifically the licensing and implementation of yield improvement solutions for companies designing and/or manufacturing integrated circuits.

The Company had revenues from individual customers in excess of 10% of total revenues as follows:

	Three Months Ended June 30,						Six Months Ended June 30,
Customer	2014			2013			2014			2013
A		50	%		32	%		48	%		32	%
B		14	%		23	%		16	%		19	%
C		11	%		18	%		12	%		21	%

The Company had gross accounts receivable from the following individual customers in excess of 10% of gross accounts receivable as follows:

Customer	June 30, 2014			December 31, 2013
A		45	%		36	%
B		21	%		17	%
C		11	%		23	%

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,
	2014					2013
	Revenues		Percentage of Revenues			Revenues		Percentage of Revenues
North America	$	10,158		41	%	$	10,816		44	%
Germany		9,034		37			5,241		21
South Korea		1,242		5			3,631		15
Japan		1,216		5			1,961		8
Rest of Asia		1,223		5			2,098		8
Rest of Europe		1,737		7			1,029		4
Total revenue	$	24,610		100	%	$	24,776		100	%

	Six Months Ended June 30,
	2014					2013
	Revenues		Percentage of Revenues			Revenues		Percentage of Revenues
North America	$	21,558		42	%	$	20,682		42	%
Germany		18,134		35			9,866		20
South Korea		3,502		7			8,544		18
Japan		2,929		6			4,222		9
Rest of Asia		2,717		5			3,642		7
Rest of Europe		2,856		5			1,930		4
Total revenue	$	51,696		100	%	$	48,886		100	%

Long-lived assets, net by geographic area are as follows (in thousands):

	June 30, 2014		December 31, 2013
North America	$	7,962	$	6,578
Asia		415		364
Europe		120		122
Total long-lived assets, net	$	8,497	$	7,064

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Note 9 - Fair Value Measurements

6 Months Ended

Jun. 30, 2014

Fair Value Disclosures [Abstract]

Fair Value Disclosures [Text Block]

9. FAIR VALUE MEASUREMENTS

Fair value is the exit price, or the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants as of the measurement date. The multiple assumptions used to value financial instruments are referred to as inputs, and a hierarchy for inputs used in measuring fair value is established, that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs reflect assumptions market participants would use in pricing an asset or liability based on market data obtained from independent sources while unobservable inputs reflect a reporting entity’s pricing based upon its own market assumptions. These inputs are ranked according to a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels.

Level 1 -	Inputs are quoted prices in active markets for identical assets or liabilities.
Level 2 -	Inputs are quoted prices for similar assets or liabilities in an active market, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable and market-corroborated inputs which are derived principally from or corroborated by observable market data.
Level 3 -	Inputs are derived from valuation techniques in which one or more significant inputs or value drivers are unobservable.

The following table represents the Company’s assets measured at fair value on a recurring basis as of June 30, 2014, and the basis for that measurement (in thousands):

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	$	26,354	$	26,354	$	—	$	—

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 Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Money market mutual funds	$	26,353	$	26,353	$	—	$	—

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 both the three months and six months ended June 30, 2014, the Company recognized a realized loss on the contracts of $0.1 million, which is recorded in other income (expense), net in the Company’s Statement of Operations and Comprehensive Income.

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 June 30, 2014, the Company had one outstanding forward contract with a notional amount of $7.2 million and recorded $23,000 other current assets associated with this outstanding forward contract. 

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Accounting Policies, by Policy (Policies)

6 Months Ended

Jun. 30, 2014

Accounting Policies [Abstract]

Basis of Accounting, Policy [Policy Text Block]

Basis of Presentation

The interim unaudited condensed consolidated financial statements included herein have been prepared by PDF Solutions, Inc. (“the Company”) pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”), including the instructions to the Quarterly Report on Form 10-Q and Article 10 of Regulation S-X. Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted. The interim unaudited condensed consolidated financial statements reflect, in the opinion of management, all adjustments necessary (consisting only of normal recurring adjustments), to present a fair statement of results for the interim periods presented. The operating results for any interim period are not necessarily indicative of the results that may be expected for other interim periods or the full fiscal year. The accompanying interim unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto in the Company’s Annual Report on Form 10-K for the year ended December 31, 2013.

The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries after the elimination of all significant intercompany balances and transactions.

The condensed consolidated balance sheet at December 31, 2013, has been derived from the audited consolidated financial statements but does not include all disclosures required by accounting principles generally accepted in the United States of America.

Use of Estimates, Policy [Policy Text Block]

Use of Estimates  —  The preparation of financial statements in conformity with generally accepted accounting principles in the United States (“U.S. GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Significant estimates in these financial statements include 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.

Revenue Recognition, Policy [Policy Text Block]

Revenue Recognition  — The Company derives revenue from two sources: Design-to-silicon-yield solutions and Gainshare performance incentives.

Design-to-Silicon-Yield Solutions — Revenue that is derived from Design-to-silicon-yield solutions comes from services and software licenses. The Company recognizes revenue of Design-to-silicon-yield solutions as follows:

The Company generates a significant portion of its Design-to-silicon-yield solutions revenue from fixed-price solution implementation service contracts delivered over a specific period of time. These contracts require reliable estimation of costs to perform obligations and the overall scope of each engagement. Revenue under project–based contracts for solution implementation services is recognized as services are performed using the cost-to-cost percentage of completion method of contract accounting. Losses on fixed-price solution implementation contracts are recognized in the period when they become probable. Revisions in profit estimates are reflected in the period in which the conditions that require the revisions become known and can be estimated. Revenue under time and materials contracts for solution implementation services are recognized as the services are performed. On occasion, the Company licenses its software products as a component of its fixed-price service contracts. In such instances, the software products are licensed to customers over a specified term of the agreement with support and maintenance to be provided at each customer's option over the license term. The amount of product and service revenue recognized in a given period is affected by the Company’s judgment as to whether an arrangement includes multiple deliverables and, if so, the Company’s determination of the fair value of each deliverable. In general, vendor-specific objective evidence of selling price (“VSOE”) does not exist for the Company’s solution implementation services and software products and because the Company’s services and products include our unique technology, the Company is not able to determine third-party evidence of selling price (“TPE”). Therefore, in such circumstances the Company uses best estimated selling prices (“BESP”) in the allocation of arrangement consideration. In determining BESP, the Company applies significant judgment as the Company’s weighs a variety of factors, based on the facts and circumstances of the arrangement. The Company typically arrives at BESP for a product or service that is not sold separately by considering company-specific factors such as geographies, internal costs, gross margin objectives, pricing practices used to establish bundled pricing, and existing portfolio pricing and discounting. After fair value is established for each deliverable, the total transaction amount is allocated to each deliverable based upon its relative fair value. Fees allocated to solution implementation services are recognized using the cost-to-cost percentage of completion method of contract accounting. Fees allocated to software and related support and maintenance are recognized under software revenue recognition guidance. 

 The Company also licenses its software products separately from its solution implementations. For software license arrangements that do not require significant modification or customization of the underlying software, software license revenue is recognized under the residual method when (1) persuasive evidence of an arrangement exists, (2) delivery has occurred, (3) the fee is fixed or determinable, (4) collectability is probable, and (5) the arrangement does not require services that are essential to the functionality of the software. When arrangements include multiple elements such as support and maintenance, consulting (other than for its fixed price solution implementations), installation, and training, revenue is allocated to each element of a transaction based upon its fair value as determined by the Company’s VSOE and such services are recorded as services revenue. VSOE for maintenance is generally established based upon negotiated renewal rates while VSOE for consulting, installation, and training services is established based upon the Company’s customary pricing for such services when sold separately. Revenue for software licenses with extended payment terms is not recognized in excess of amounts due. For software license arrangements that require significant modification or customization of the underlying software, the software license revenue is recognized as services are performed using the cost-to-cost percentage of completion method of contract accounting, and such revenue is recorded as services revenue.

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.

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Note 6 - Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Note 6 - Income Taxes (Details) [Line Items]
Income Tax Expense Benefit Period Increase Decrease			$ 1,400,000
Income Tax Expense (Benefit)	3,030,000	2,791,000	6,069,000	4,639,000
Effective Income Tax Rate Reconciliation, Percent			35.66%	33.32%
Income Tax Credits and Adjustments			0
Unrecognized Tax Benefits	10,200,000		10,200,000		10,200,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	6,200,000		6,200,000		6,300,000
Unrecognized Tax Benefits In Long Term Liabilities	2,800,000		2,800,000
Unrecognized Tax Benefits In Deferred Tax Assets	7,800,000		7,800,000
Unrecognized Tax Benefits In Deferred Tax Asset Subject To Full Valuation Allowance	4,000,000		4,000,000
Research Tax Credit Carryforward [Member]
Note 6 - Income Taxes (Details) [Line Items]
Income Tax Credits and Adjustments				$ 400,000

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Note 8 - Customer and Geographic Information (Tables)

6 Months Ended

Jun. 30, 2014

Segment Reporting [Abstract]

Disclosure on Geographic Areas, Description of Revenue from External Customers

	Three Months Ended June 30,						Six Months Ended June 30,
Customer	2014			2013			2014			2013
A		50	%		32	%		48	%		32	%
B		14	%		23	%		16	%		19	%
C		11	%		18	%		12	%		21	%

Disclosure on Geographic Areas, Long-Lived Assets

Customer	June 30, 2014			December 31, 2013
A		45	%		36	%
B		21	%		17	%
C		11	%		23	%

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]

	Three Months Ended June 30,
	2014					2013
	Revenues		Percentage of Revenues			Revenues		Percentage of Revenues
North America	$	10,158		41	%	$	10,816		44	%
Germany		9,034		37			5,241		21
South Korea		1,242		5			3,631		15
Japan		1,216		5			1,961		8
Rest of Asia		1,223		5			2,098		8
Rest of Europe		1,737		7			1,029		4
Total revenue	$	24,610		100	%	$	24,776		100	%

	Six Months Ended June 30,
	2014					2013
	Revenues		Percentage of Revenues			Revenues		Percentage of Revenues
North America	$	21,558		42	%	$	20,682		42	%
Germany		18,134		35			9,866		20
South Korea		3,502		7			8,544		18
Japan		2,929		6			4,222		9
Rest of Asia		2,717		5			3,642		7
Rest of Europe		2,856		5			1,930		4
Total revenue	$	51,696		100	%	$	48,886		100	%

Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]

	June 30, 2014		December 31, 2013
North America	$	7,962	$	6,578
Asia		415		364
Europe		120		122
Total long-lived assets, net	$	8,497	$	7,064

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Note 4 - Stockholders' Equity (Details) (USD $)	6 Months Ended				3 Months Ended	6 Months Ended			6 Months Ended		31 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	May 27, 2014	Nov. 08, 2012	Mar. 31, 2014 Employee Stock Option [Member]	Jun. 30, 2014 Employee Stock Option [Member]	Jun. 30, 2014 Restricted Stock [Member]	May 27, 2014 Shares Previously Issued Under the 2001 Plan [Member]	Jun. 30, 2014 2011 Stock Incentive Plan [Member]	Jun. 30, 2014 IDS Plan [Member]	Jun. 30, 2014 2001 Stock Incentive Plan [Member]	Jun. 30, 2014 Employee Stock Purchase Plan [Member]	Jun. 30, 2013 Employee Stock Purchase Plan [Member]	Jun. 30, 2014 Employee Stock Purchase Plan [Member]	Jun. 30, 2013 Employee Stock Purchase Plan [Member]
Note 4 - Stockholders' Equity (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years								4 years	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)			6,550,000					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)									7,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)									3,900,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period (in Shares)	16,000										400,000
Share Price (in Dollars per share)	$ 21.22
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value						$ 5,000,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized						3,100,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition					1 year 255 days		3 years 36 days							1 year
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	1,200,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options							16,700,000					400,000		400,000
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate												10.00%		10.00%
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent														85.00%
ESPP Maximum Annual Share Replenishment (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)	52,000	104,000
Employee Stock Purchase Plan Weighted Average Purchase Price Of Shares Purchased (in Dollars per share)	$ 12.10	$ 5.24
Share-based Compensation	4,034,000	3,018,000										100,000	200,000	300,000	400,000
Number Of ESPP Shares Available For Future Issuance (in Shares)						1,200,000
Stock Repurchase Program, Authorized Amount				20,000,000
Stock Repurchased During Period, Shares (in Shares)	230,311
Stock Repurchsed During Period Average Per Share Price (in Dollars per share)	$ 17.56
Stock Repurchased During Period, Value	4,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 16,000,000

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Note 8 - Customer and Geographic Information (Details) - Long-lived Assets, by Geographical Areas (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Note 8 - Customer and Geographic Information (Details) - Long-lived Assets, by Geographical Areas [Line Items]
Long-lived assets net, by geographical areas	$ 8,497	$ 7,064
North America [Member]
Note 8 - Customer and Geographic Information (Details) - Long-lived Assets, by Geographical Areas [Line Items]
Long-lived assets net, by geographical areas	7,962	6,578
Asia [Member]
Note 8 - Customer and Geographic Information (Details) - Long-lived Assets, by Geographical Areas [Line Items]
Long-lived assets net, by geographical areas	415	364
Europe [Member]
Note 8 - Customer and Geographic Information (Details) - Long-lived Assets, by Geographical Areas [Line Items]
Long-lived assets net, by geographical areas	$ 120	$ 122

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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Operating activities:
Net income	$ 10,951,000	$ 9,283,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	940,000	575,000
Stock-based compensation expense	4,034,000	3,018,000
Amortization of acquired intangible assets	30,000	37,000
Deferred taxes	2,224,000	2,494,000
Loss (gain) on disposal of property and equipment	(93,000)	3,000
Purchases of treasury stock in connection with tax withholdings on restricted stock grants	(855,000)	(385,000)
Reversal of allowance for doubtful accounts	(28,000)	(82,000)
Unrealized gain on foreign currency forward contract	(23,000)
Tax benefit related to stock-based compensation expense	1,657,000	141,000
Excess tax benefit from stock-based compensation	(1,543,000)	(79,000)
Changes in operating assets and liabilities:
Accounts receivable	4,183,000	7,707,000
Prepaid expenses and other assets	(1,658,000)	(2,027,000)
Accounts payable	(321,000)	(1,079,000)
Accrued compensation and related benefits	(1,660,000)	(3,622,000)
Accrued and other liabilities	(649,000)	(1,170,000)
Deferred revenues	1,380,000	(219,000)
Billings in excess of recognized revenues	(215,000)	(291,000)
Net cash provided by operating activities	18,354,000	14,304,000
Investing activities:
Purchases of property and equipment	(1,946,000)	(2,537,000)
Proceeds from the sales of property and equipment	135,000
Net cash used in investing activities	(1,811,000)	(2,537,000)
Financing activities:
Proceeds from exercise of stock options	2,398,000	2,810,000
Proceeds from employee stock purchase plan	632,000	546,000
Excess tax benefit from stock-based compensation	1,543,000	79,000
Purchases of treasury stock	(3,566,000)
Net cash provided by financing activities	1,007,000	3,435,000
Effect of exchange rate changes on cash and cash equivalents	(12,000)	(72,000)
Net change in cash and cash equivalents	17,538,000	15,130,000
Cash and cash equivalents, beginning of period	89,371,000	61,637,000
Cash and cash equivalents, end of period	106,909,000	76,767,000
Cash paid during the period for:
Taxes	2,702,000	2,303,000
Property and equipment received and accrued in accounts payable and accrued and other liabilities	$ 788,000	$ 350,000

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Note 5 - Restructuring

6 Months Ended

Jun. 30, 2014

Restructuring and Related Activities [Abstract]

Restructuring and Related Activities Disclosure [Text Block]

5. RESTRUCTURING

The Company implemented restructuring plans during fiscal years 2012 and 2008, and recorded total restructuring charges of zero and $9,000 for the three months ended on June 30, 2014 and 2013, respectively. The Company recorded total restructuring charges of $57,000 for the six months ended June 30, 2014 and restructuring credits of $43,000 for the six months ended June 30, 2013. As of June 30, 2014, the Company had no outstanding restructuring accrual balance.

October 2012 Plan

On October 24, 2012, the Company announced a restructuring plan as part of the Company’s continuing efforts to simplify the organization, leverage cross-training and learning, and reduce annual operations expenses. Under this plan, the Company has recorded restructuring charges of $2.2 million, which primarily consisted of employee severance costs of $2.1 million. All outstanding accrual balance under this plan had been paid out as of June 30, 2014. The following table summarizes the activities of restructuring liabilities (in thousands) under this plan for the periods covered below:

	Three Months Ended June 30,						Six Months Ended June 30,
	2014			2013			2014			2013
Beginning balance	$	62		$	210		$	13		$	896
Restructuring charges (credits)		—			9			57			59
Cash payments		(62	)		(153	)		(70	)		(889	)
Ending balance	$	—		$	66		$	—		$	66

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. All remaining accrual balance under this plan had been paid out as of December 31, 2013. There were no restructuring activities incurred under this plan during the three and six months ended June 30, 2014. The following table summarizes the activities of restructuring liabilities (in thousands) under this plan for the periods covered below:

	Three Months Ended June 30,					Six Months Ended June 30,
	2014		2013			2014		2013
Beginning balance	$	—	$	224		$	—	$	448
Restructuring charges (credits)		—		—			—		(102	)
Adjustments		—		3			—		3
Cash payments		—		(122	)		—		(244	)
Ending balance	$	—	$	105		$	—	$	105

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Note 4 - Stockholders' Equity (Details) - Allocation of Recognized Period Costs (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Allocation of Recognized Period Costs	$ 2,374	$ 1,709	$ 4,034	$ 3,018
Cost of Sales [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Allocation of Recognized Period Costs	797	649	1,520	1,183
Research and Development Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Allocation of Recognized Period Costs	434	337	805	659
Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Allocation of Recognized Period Costs	$ 1,143	$ 723	$ 1,709	$ 1,176

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Note 8 - Customer and Geographic Information (Details) - Revenue Percentage by Major Customers (Customer Concentration Risk [Member])	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Note 8 - Customer and Geographic Information (Details) - Revenue Percentage by Major Customers [Line Items]
Revenue Percentage by Major Customers			10.00%
Customer A [Member] | Sales Revenue, Net [Member]
Note 8 - Customer and Geographic Information (Details) - Revenue Percentage by Major Customers [Line Items]
Revenue Percentage by Major Customers	50.00%	32.00%	48.00%	32.00%
Customer B [Member] | Sales Revenue, Net [Member]
Note 8 - Customer and Geographic Information (Details) - Revenue Percentage by Major Customers [Line Items]
Revenue Percentage by Major Customers	14.00%	23.00%	16.00%	19.00%
Customer C [Member] | Sales Revenue, Net [Member]
Note 8 - Customer and Geographic Information (Details) - Revenue Percentage by Major Customers [Line Items]
Revenue Percentage by Major Customers	11.00%	18.00%	12.00%	21.00%

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Note 7 - Net Income Per Share (Tables)

6 Months Ended

Jun. 30, 2014

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Three Months Ended June 30,				Six Months Ended June 30,
	2014		2013		2014		2013
Numerator:
Net income	$	4,696	$	4,552	$	10,951	$	9,283
Denominator:
Basic weighted average common shares outstanding		30,590		29,650		30,533		29,501
Dilutive effect of equity incentive plans		1,292		1,504		1,390		1,484
Diluted weighted average common shares outstanding		31,882		31,154		31,923		30,985
Net income per share:
Basic	$	0.15	$	0.15	$	0.36	$	0.31
Diluted	$	0.15	$	0.15	$	0.34	$	0.30

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

	Three Months Ended June 30,				Six Months Ended June 30,
	2014		2013		2014		2013
Outstanding options		52		112		22		110
Nonvested restricted stock units		173		174		2		88
Employee Stock Purchase Plan		43		—		46		—
Total		268		286		70		198