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Income Taxes (Deferred Tax Assets, Liabilities and Valuation Allowance) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Deferred tax assets: |  |
Research and experimentation credit and deduction carryforwards | $ 60,041 | $ 62,771
Net operating loss carryforwards | 44,424 | 45,985
Depreciation and amortization | 5,568 | 5,664
Reserves and accrued expenses | 1,000 | 992
Deferred stock-based compensation | 821 | 994
Foreign tax credit carryforwards | 163 | 208
Other | 1,201 | 1,451
Total gross deferred tax assets | 113,218 | 118,065
Deferred tax liabilities: |  |
Foreign earnings | (212) | 0
Other | (620) | (812)
Total gross deferred tax liabilities | (832) | (812)
Less valuation allowance | (111,941) | (116,372)
Net deferred tax assets | $ 445 | $ 881

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