Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Income tax benefits for the net losses incurred	$ 0	$ 0	$ 0
Income tax benefits for the research and development tax credits	$ 0	0	$ 0
Period of measurement for change in ownership	3 years
Unrecognized tax benefits	$ 0	0
Interest and penalties accrued	$ 0	$ 0
Income tax examination, description	The Company is currently under examination by the Internal Revenue Service ("IRS") for the period ended December 31, 2016.
Minimum
Operating Loss Carryforwards [Line Items]
Percentage increase in the ownership	50.00%
Federal
Operating Loss Carryforwards [Line Items]
Income tax benefits for the net losses incurred	$ 71,495,000
Net operating loss carryforwards, expiration year	2034
State
Operating Loss Carryforwards [Line Items]
Income tax benefits for the net losses incurred	$ 73,021,000
Net operating loss carryforwards, expiration year	2034
Research and Development | Federal
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	$ 4,501,000
Tax credit carryforwards, expiration year	2034
Research and Development | State
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	$ 2,025,000
Tax credit carryforwards, expiration year	2030