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Income Taxes - Effective Tax Rate (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Tax at federal statutory rate	21.00%	34.00%	34.00%
State tax, net of federal benefit	1.88%	1.03%	0.15%
Stock-based compensation	(5.84%)	(38.63%)	(8.19%)
Warrant expense	(6.98%)	(1.00%)	(0.03%)
Other items	(1.46%)	(1.10%)	(0.66%)
Research and development credits	10.54%	102.35%	0.00%
Net operating loss expiration	0.00%	(9.29%)	0.00%
Change in valuation allowance	(19.21%)	458.55%	(25.26%)
Rate differential impact of Tax Cuts and Jobs Act of 2017	0.00%	(545.38%)	0.00%
Effective tax rate	(0.07%)	0.53%	0.01%

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