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Income Taxes Income Taxes - Effective Income Tax Rate Reconciliation (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]    
Federal tax provision (benefit) rate (21.00%) (21.00%)
State tax provision, net of federal provision 19.90% (19.60%)
EffectiveIncomeTaxRateReconciliationImpactOfPermanentDifferences 1.10% (315.00%)
Federal research and development credits (0.00%) 659.20%
Effective Income Tax Rate Reconciliation 382 Limitation 861.50% (0.00%)
Change in statutory tax rate (0.00%) (0.00%)
Valuation allowance (861.50%) (303.60%)
Effective income tax rate 0.00% 0.00%