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Income Taxes (Deferred Tax Assets, Liabilities and Valuation Allowance) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Research and experimentation credit and deduction carryforwards $ 65,772 $ 67,648
Net operating loss carryforwards 50,917 47,779
Depreciation and amortization 2,282 1,956
Deferred stock-based compensation 1,158 1,134
Foreign tax credit carryforwards 275 719
Reserves and accrued expenses 145 1,785
Other 2,074 1,434
Total gross deferred tax assets 122,623 122,455
Deferred tax liabilities:    
Other (1,526) (1,300)
Total gross deferred tax liabilities (1,526) (1,300)
Less valuation allowance (120,981) (121,005)
Net deferred tax assets $ 116 $ 150