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Income Taxes - Reconciliation of Effective Income Tax Rate (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]    
Federal statutory tax rate (21.00%) (21.00%)
State income taxes, net of federal tax benefits (3.60%) (3.90%)
Change in fair value of preferred stock liabilities (0.50%) 0.80%
Change in valuation allowance (36.10%) 23.20%
Limitation of net operating losses 59.80% 0.00%
Other 1.60% 1.60%
Effective tax rate 0.20% 0.70%