Defined Contribution Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Contribution Plan [Abstract]
Required time period for employees for profit sharing plan	3 months
Maximum employer contribution as a percentage of employee contribution	50.00%
Contribution expense recognized	$ 0.0	$ 0.0	$ 0.0
Employer matching contribution amount	$ 1.8	$ 1.5	$ 1.1