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INCOME TAXES - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred tax asset:    
Net operating loss carry forwards $ 3,405 $ 3,716
Capitalized technology license 4,163 3,922
Capitalized research expenditures 8,100 10,206
Accruals and reserves 1,112 3,275
Retirement plan 9,723 8,062
Deferred revenue 516 731
Tax credit carry forwards 1,846 7,973
Stock-based compensation 2,889 2,012
Other 874 1,857
Deferred Tax Assets, Gross 32,628 41,754
Valuation allowance (7,950) (14,483)
Deferred tax assets 24,678 27,271
Deferred tax liability:    
Acquisition goodwill (185)  
Deferred tax liabilities (185)  
Net deferred tax assets $ 24,493 $ 27,271