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Leases - Future minimum payments for finance and operating leases (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Finance leases
2021	$ 251
2022	209
Total future minimum lease payments	460
Amounts representing interest	(30)
Total finance lease liabilities	430	$ 640
Operating leases
2021	1,788
2022	1,826
2023	1,584
2024	852
2025	640
Thereafter	1,597
Total future minimum lease payments	8,287
Amounts representing interest	(426)
Total operating lease liabilities	$ 7,861	$ 8,864

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