Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (unaudited) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues:
Design-to-silicon-yield solutions	$ 14,950,000	$ 13,793,000	$ 29,798,000	$ 27,179,000
Gainshare performance incentives	9,826,000	8,738,000	19,088,000	15,995,000
Total revenues	24,776,000	22,531,000	48,886,000	43,174,000
Costs of design-to-silicon-yield solutions:
Direct costs of design-to-silicon-yield solutions	9,741,000	8,801,000	19,398,000	17,373,000
Amortization of acquired technology		105,000		261,000
Total costs of design-to-silicon-yield solutions	9,741,000	8,906,000	19,398,000	17,634,000
Gross profit	15,035,000	13,625,000	29,488,000	25,540,000
Operating expenses:
Research and development	3,184,000	3,291,000	6,548,000	6,448,000
Selling, general and administrative	4,404,000	4,719,000	9,198,000	9,624,000
Amortization of other acquired intangible assets	19,000	51,000	37,000	102,000
Restructuring charges (credits)	9,000	91,000	(43,000)	83,000
Total operating expenses	7,616,000	8,152,000	15,740,000	16,257,000
Income from operations	7,419,000	5,473,000	13,748,000	9,283,000
Interest and other income (expense), net	(76,000)	155,000	174,000	13,000
Income before income taxes	7,343,000	5,628,000	13,922,000	9,296,000
Income tax provision	2,791,000	808,000	4,639,000	977,000
Net income	4,552,000	4,820,000	9,283,000	8,319,000
Net income per share:
Basic (in Dollars per share)	$ 0.15	$ 0.17	$ 0.31	$ 0.29
Diluted (in Dollars per share)	$ 0.15	$ 0.16	$ 0.30	$ 0.28
Weighted average common shares:
Basic (in Shares)	29,650	28,560	29,501	28,472
Diluted (in Shares)	31,154	29,560	30,985	29,303
Net income	4,552,000	4,820,000	9,283,000	8,319,000
Other comprehensive income:
Foreign currency translation adjustments, net of tax	182,000	(457,000)	13,000	(267,000)
Reclassification adjustment for other-than-temporary impairment on auction-rate-securities recognized in earnings		216,000		216,000
Comprehensive income	$ 4,734,000	$ 4,579,000	$ 9,296,000	$ 8,268,000