Annual report pursuant to Section 13 and 15(d)

Income Taxes - Schedule of Reconciliation of Statutory Federal Income Tax Rate to Income Tax Expense (Benefit) (Details)

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Income Taxes - Schedule of Reconciliation of Statutory Federal Income Tax Rate to Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]      
Income tax at statutory rate $ (919) $ 240 $ 369
Change in valuation allowance 1,288 (165) (17)
State tax (288) (37) (133)
Stock-based compensation 62 (11) (420)
Research and development credit (160) (103) (82)
Foreign rate differential 7 (40) (43)
Other 66 26 285
Total income tax expense (benefit) $ 56 $ (90) $ (41)