Leases - Future maturities of lease liabilities (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Future maturities of lease liabilities
2019 (remaining)	$ 1,738
2020	6,071
2021	4,629
2022	3,261
2023	1,242
Thereafter	79
Total lease payments	17,020
Less: imputed interest	(1,327)
Total lease liability	$ 15,693