Leases - Future minimum payments for finance and operating leases (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Finance leases
2020	$ 251
2021	251
2022	150
Total future minimum lease payments	652
Amounts representing interest	(63)
Total operating lease liabilities	589	$ 640
Operating leases
2020	2,037
2021	1,630
2022	1,592
2023	1,441
2024	761
Thereafter	2,083
Total future minimum lease payments	9,544
Amounts representing interest	(1,064)
Total operating lease liabilities	$ 8,480	$ 8,864