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
	Mar. 31, 2013	Mar. 31, 2012
Revenues:
Design-to-silicon-yield solutions	$ 14,848,000	$ 13,386,000
Gainshare performance incentives	9,262,000	7,257,000
Total revenues	24,110,000	20,643,000
Cost of design-to-silicon-yield solutions:
Direct costs of design-to-silicon-yield solutions	9,657,000	8,572,000
Amortization of acquired technology		156,000
Total cost of design-to silicon-yield solutions	9,657,000	8,728,000
Gross profit	14,453,000	11,915,000
Operating expenses:
Research and development	3,364,000	3,157,000
Selling, general and administrative	4,794,000	4,905,000
Amortization of other acquired intangible assets	18,000	51,000
Restructuring credits	(52,000)	(8,000)
Total operating expenses	8,124,000	8,105,000
Income from operations	6,329,000	3,810,000
Interest and other income (expense), net	250,000	(142,000)
Income before income taxes	6,579,000	3,668,000
Income tax provision	1,848,000	169,000
Net income	4,731,000	3,499,000
Net income per share:
Basic (in Dollars per share)	$ 0.16	$ 0.12
Diluted (in Dollars per share)	$ 0.15	$ 0.12
Weighted average common shares
Basic (in Shares)	29,353	28,384
Diluted (in Shares)	30,815	29,046
Net income	4,731,000	3,499,000
Other comprehensive income:
Foreign currency translation adjustments, net of tax	(169,000)	191,000
Comprehensive income	$ 4,562,000	$ 3,690,000