Leases - Future minimum payments for finance and operating leases (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Finance leases
2020	$ 251
2021	251
2022	209
Total future minimum lease payments	711
Amounts representing interest	(71)
Total operating lease liabilities	640
Operating leases
2020	2,197
2021	1,560
2022	1,563
2023	1,488
2024	898
Thereafter	2,272
Total future minimum lease payments	9,978
Amounts representing interest	(1,114)
Total operating lease liabilities	$ 8,864