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Income Taxes - Reconciliation for Provision for Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]      
Tax benefit at U.S. statutory rate $ (5,154) $ 4,402 $ (3,470)
State income taxes, net of federal benefit 10 32 24
Foreign income and withholding taxes 79 89 (22)
Expenses from resolution of certain tax audits and expiration of statute of limitations 64 (32) (16)
Stock-based compensation (6,386) 113 258
Section 162(m) 621 0 0
Expired attributes 3,118 1,964 846
Change in valuation allowance 6,986 (5,857) (3)
Research and development credits (43) (261) (72)
Global Intangible Low-Taxed Income 0 6 176
Adoption of accounting principles 0 0 2,464
Other 420 (159) 170
Provision for (benefit from) income taxes $ (285) $ 297 $ 355