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Income Taxes - Reconciliation (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Income tax computed at federal statutory tax rate 21.00% 21.00% 21.00%
State taxes, net of federal benefit 6.30% 6.70% 6.10%
Permanent differences (0.20%) 1.20% (2.00%)
General business credits 3.80% 3.40% 10.30%
Stock compensation 0.10% 0.00% 0.00%
Impact of ownership shift 0.00% 0.00% (53.30%)
Change in valuation allowance (31.00%) (32.30%) 17.90%
Income tax benefit 0.00% 0.00% 0.00%