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Leases - Future minimum payments for finance and operating leases (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Finance leases
2022	$ 251
2023	21
Total future minimum lease payments	272
Amounts representing interest	(11)
Total finance lease liabilities	261	$ 430
Operating leases
2022	1,597
2023	1,439
2024	676
2025	389
2026	250
Thereafter	238
Total future minimum lease payments	4,589
Amounts representing interest	(161)
Total operating lease liabilities	$ 4,428	$ 7,861

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