Income Taxes - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Valuation allowance for deferred tax assets			$ 8.7
Decrease in valuation allowance resulting in income tax expense		$ (8.7)
Statutory income tax rate	21.00%	35.00%
Remeasurement result in decrease to net deferred tax asset		$ 25.6