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Leases - Future minimum payments for finance and operating leases (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Finance leases
2022	$ 251
2023	146
Total future minimum lease payments	397
Amounts representing interest	(22)
Total finance lease liabilities	375	$ 430
Operating leases
2022	1,787
2023	1,823
2024	1,317
2025	596
2026	552
Thereafter	1,494
Total future minimum lease payments	7,569
Amounts representing interest	(429)
Total operating lease liabilities	$ 7,140	$ 7,861

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