Leases - Maturity (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Operating leases
2019 - remaining	$ 2,318
2020	4,691
2021	4,717
2022	4,567
2023	3,813
Thereafter	8,081
Total undiscounted lease payments	28,187
Less imputed interest	(3,670)
Total lease liabilities	$ 24,517