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Income Taxes - Reconciliation of Statutory Income Tax Rate (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Income tax provision at statutory rate (as a percent) 21.00% 21.00% 21.00%
State income taxes, net of federal benefit (as a percent) (38.00%) 6.00% 5.00%
Share-based compensation (as a percent) (100.00%) 56.00% (2.00%)
Warrant valuation (as a percent)   (45.00%) (10.00%)
Change in valuation allowance (as a percent) (317.00%) (35.00%) 13.00%
State rate change (as a percent)     2.00%
Other (as a percent) (2.00%) (3.00%) (3.00%)
Effective tax rate (as a percent) (436.00%) 0.00% 26.00%