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Income Taxes - Reconciliation of Provision (Benefit) for Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of Provision (Benefit) for Income Taxes [Abstract]    
Tax provision at expected statutory rate $ 274 $ 821
State taxes, net of federal benefit 31 92
Permanent differences 45 34
Credits 7 (108)
Foreign tax expense, and other 1 13
Change in rate (38) 63
Change in valuation allowance (9) (4,709)
Provision to return 15 0
Permanent true-ups 0 687
Other 10 0
Income tax provision (benefit) $ 336 $ (3,107)