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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

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