Leases - Maturity Analysis of Lease Liabilities (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Operating Leases
Six months ending December 31, 2019	$ 2,737
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	29,891
Less: imputed interest	6,504
Total lease liabilities	23,387
Finance Leases
Six months ending December 31, 2019	118
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	1,038
Less: imputed interest	153
Total lease liabilities	$ 885