Income Taxes - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Tax Contingency
Increase in valuation allowance for deferred tax assets	$ 17.3	$ 19.2
Federal operating loss carryforwards without expiration date	47.6
Federal
Income Tax Contingency
Net operating loss carryforwards	98.1
Tax credit carryforward amount	8.0
State
Income Tax Contingency
Net operating loss carryforwards	100.1
Tax credit carryforward amount	$ 2.0