Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Percent of pre-tax income:
U.S. federal statutory income tax rate	21.00%	21.00%	35.00%
State taxes, net of federal benefit	10.90%	18.50%	14.60%
Permanent items	(1.00%)	4.00%	4.00%
Remeasurement of deferred tax assets	0.00%	0.00%	49.90%
Impact of state rate changes	0.10%	(0.20%)	(27.90%)
Research and development credit	2.80%	(2.40%)	(0.00%)
Alternative minimum tax credit	0.00%	0.00%	(1.30%)
Change in valuation allowance	(33.60%)	(42.60%)	(78.60%)
Effective income tax rate	0.20%	(1.70%)	(4.30%)