Leases - Additional information (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($) term	Jun. 30, 2019 USD ($) term	Jun. 30, 2018 USD ($)
Leases [Abstract]
Operating lease, term of contract	5 years	5 years
Operating lease, number of renewal terms | term	1	1
Operating lease, renewal term	5 years	5 years
Short-term lease expense	$ 0.1	$ 0.2
Operating leases, rent expense	$ 1.0		$ 2.1