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Income Taxes - Reconciliation of Effective Tax Rate To Statutory U.S. Federal Rate (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes      
Statutory U.S. federal rate 21.00%    
U.S. Federal provision (benefit)      
At Statutory Rate $ 25,693 $ 5,956 $ 5,608
State taxes 90    
Valuation Allowance 26,245 6,320 5,671
Stock Based Compensation (7,257) (182) (141)
Permanent Differences 6,730 (182) $ 78
Provision for income taxes $ 115 $ 0