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INCOME TAXES - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred tax asset:    
Capitalized technology license $ 560 $ 553
Capitalized research expenditures 3,319 4,710
Accruals and reserves 4,130 2,890
Retirement plan 11,363 9,570
Deferred revenue 14,354 12,028
Tax credit carry forwards 3,997 2,895
Stock-based compensation 1,884 1,701
Other 1,682 47
Deferred Tax Assets, Gross 41,289 34,394
Valuation allowance (3,368) (2,893)
Deferred tax assets 37,921 31,501
Deferred tax liability:    
Accruals and reserves (7,546) (7,124)
Deferred tax liabilities (7,546) (7,124)
Net deferred tax assets $ 30,375 $ 24,377