Leases - Additional information (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($) term	Sep. 30, 2019 USD ($) term	Sep. 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	$ 30	$ 242
Operating leases, rent expense	$ 1,000		$ 3,200