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Income Taxes - Reconciliation of Income taxes Provided at Federal Statutory Rate to Actual Income Tax Provision (Benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Tax Disclosure [Abstract]    
Income tax benefit computed at U.S. statutory rate $ (1,503) $ (794)
Research and development credits (131) (66)
Amortization of intangible assets (60) (60)
Valuation allowance changes affecting tax provision 1,693 919
Other $ 1 $ 1