Leases - Maturity (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Operating leases
2019 - remaining	$ 1,164
2020	4,682
2021	4,712
2022	4,566
2023	3,812
Thereafter	8,082
Total undiscounted lease payments	27,018
Less imputed interest	(3,397)
Total lease liabilities	$ 23,621