Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues:
Design-to-silicon-yield solutions	$ 77,162	$ 63,839	$ 52,769
Gainshare performance incentives	30,299	34,138	47,394
Total revenues	107,461	97,977	100,163
Cost of Design-to-silicon-yield solutions:
Direct costs of Design-to-silicon-yield solutions	44,074	38,847	37,822
Impairment of deferred cost			1,892
Amortization of acquired technology	374	176
Total cost of Design-to-silicon-yield solutions	44,448	39,023	39,714
Gross profit	63,013	58,954	60,449
Operating expenses:
Research and development	27,559	19,096	14,064
Selling, general and administrative	22,056	20,421	18,457
Amortization of other acquired intangible assets	432	196	31
Restructuring charges			57
Total operating expenses	50,047	39,713	32,609
Income from operations	12,966	19,241	27,840
Interest and other (expense) income, net	(10)	181	119
Income before taxes	12,956	19,422	27,959
Income tax provision	3,853	7,015	9,497
Net income	$ 9,103	$ 12,407	$ 18,462
Net income per share
Basic (in dollars per share)	$ 0.29	$ 0.39	$ 0.60
Diluted (in dollars per share)	$ 0.28	$ 0.39	$ 0.58
Weighted average common shares
Basic (in shares)	31,373	31,424	30,743
Diluted (in shares)	32,431	32,164	31,939
Net income	$ 9,103	$ 12,407	$ 18,462
Other comprehensive (loss) income:
Foreign currency translation adjustments, net of tax	(448)	(862)	(1,129)
Comprehensive income	$ 8,655	$ 11,545	$ 17,333