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Income Taxes - Reconciliation of Income Taxes (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
U.S. statutory rate | 21.00% | 21.00% | 21.00%
Increase (decrease) resulting from: |  |  |
Permanent differences | 0.00% | (0.20%) | (1.00%)
State income taxes | 9.00% | 0.40% | (2.90%)
Other | 0.00% | 0.00% | 1.90%
Vesting of common stock | (0.70%) | 0.00% | (0.10%)
Change in valuation allowance | (29.10%) | (21.00%) | (21.70%)
Income tax (expense) benefit | 0.20% | 0.20% | (2.80%)

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