Leases - Maturity Analysis of Lease Liabilities (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Operating Leases
Three months ending December 31, 2019	$ 1,365
Year ending December 31, 2020	5,210
Year ending December 31, 2021	4,827
Year ending December 31, 2022	4,668
Year ending December 31, 2023	3,247
Thereafter	9,202
Total undiscounted lease payments	28,519
Less: imputed interest	6,086
Total lease liabilities	22,433
Finance Leases
Three months ending December 31, 2019	59
Year ending December 31, 2020	236
Year ending December 31, 2021	236
Year ending December 31, 2022	169
Year ending December 31, 2023	101
Thereafter	178
Total undiscounted lease payments	979
Less: imputed interest	139
Total lease liabilities	$ 840