Leases - Summary of Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Finance lease cost:
Amortization of right-of-use asset	$ 45	$ 105
Interest expense on lease liability	34	80
Total finance lease cost	79	185
Operating lease cost	515	1,545
Sublease income	(6)	(18)
Total lease costs	$ 588	$ 1,712