Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Increase in valuation allowance	$ 30,200,000	$ 14,000,000.0
U.S. statutory income tax rate	21.00%	21.00%	34.00%
Changes in deferred tax assets related to Tax Cuts and Jobs Act of 2017	$ 25,000,000.0
Federal net operating loss carryforwards	$ 225,400,000
Maturity period for net operating loss carryovers	20 years
unrecognized tax benefits	$ 2,100,000
Accrued interest or penalties related to uncertain tax positions	0	$ 0
Domestic Tax Authority [Member]
Income Taxes [Line Items]
U.S. federal net operating losses	65,100,000
U.S. federal tax credits	$ 11,000,000.0
Tax credit carryforwards expiration year	2028
Net operating loss expiration year	2028
Maximum
Income Taxes [Line Items]
U.S. statutory income tax rate			35.00%