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Income Taxes - Schedule of Components of Provision for Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current:      
Federal $ 0 $ 0 $ 0
State and local 84 168 229
Total current tax expense 84 168 229
Deferred tax (benefit):      
Federal 0 0 0
State and local 0 0 0
Total deferred tax (benefit) 0 0 0
Provision for income taxes $ 84 $ 168 $ 229