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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
Mar. 31, 2014
Mar. 31, 2013
Revenues:    
Design-to-silicon-yield solutions $ 14,919,000 $ 14,848,000
Gainshare performance incentives 12,167,000 9,262,000
Total revenues 27,086,000 24,110,000
Costs of Design-to-silicon-yield solutions 9,705,000 9,657,000
Gross profit 17,381,000 14,453,000
Operating expenses:    
Research and development 3,596,000 3,364,000
Selling, general and administrative 4,329,000 4,794,000
Amortization of other acquired intangible assets 18,000 18,000
Restructuring charges (credits) 57,000 (52,000)
Total operating expenses 8,000,000 8,124,000
Income from operations 9,381,000 6,329,000
Interest and other income (expense), net (87,000) 250,000
Income before income taxes 9,294,000 6,579,000
Income tax provision 3,039,000 1,848,000
Net income 6,255,000 4,731,000
Net income per share:    
Basic (in Dollars per share) $ 0.21 $ 0.16
Diluted (in Dollars per share) $ 0.20 $ 0.15
Weighted average common shares    
Basic (in Shares) 30,477 29,353
Diluted (in Shares) 31,965 30,815
Net income 6,255,000 4,731,000
Other comprehensive income:    
Foreign currency translation adjustments, net of tax (52,000) (169,000)
Comprehensive income $ 6,203,000 $ 4,562,000