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Income Taxes - Summary of Components of Expense for (Benefit) from Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
U.S. federal $ 391 $ 243
U.S. state 234 40
Total current tax expense 625 283
U.S. federal (86) (63)
U.S. state (36) (26)
Total deferred tax benefit (122) (89)
Total income tax expense $ 503 $ 194