Leases - (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Lease
Discount rate for the leases	6.76%		6.76%
Rent expense for operating leases	$ 1.5		$ 3.1
Operating leases, rent expense		$ 1.5		$ 3.0
Sublease income	$ 0.2	$ 0.1	$ 0.4	$ 0.4
Lease, Practical Expedients, Package			true