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Income Taxes - Reconciliation of U.S Statutory Rate (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]    
Tax at federal statutory rate $ (11,007) $ (7,902)
State taxes, net of federal benefit (2,270) (1,582)
Permanent differences (4,731) 289
Loss on Series C warrant liability 5,330 2,500
Change in valuation allowance 12,797 6,197
General business credits (319) 136
Other 208 376
Provision for income taxes $ 8 $ 14