Annual report pursuant to Section 13 and 15(d)

Income Taxes - Schedule of Reconciliation of Statutory Federal Income Tax Rate to Net Income (Loss) Taxes (Details)

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Income Taxes - Schedule of Reconciliation of Statutory Federal Income Tax Rate to Net Income (Loss) Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Income tax at statutory rate $ 240 $ 369 $ (575)
Change in valuation allowance (165) (17) 1,595
Change in deferreds 8 100 7
State tax (37) (133) (309)
Stock-based compensation (11) (420) (615)
Research and development credit (103) (82) (220)
Foreign rate differential (40) (43) (86)
Other 18 185 190
Total tax expense (benefit) $ (90) $ (41) $ (13)