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Leases - Future minimum payments for finance and operating leases (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Finance leases
2022	$ 251
2023	84
Total future minimum lease payments	335
Amounts representing interest	(16)
Total finance lease liabilities	319	$ 430
Operating leases
2022	1,664
2023	1,616
2024	1,112
2025	392
2026	345
Thereafter	326
Total future minimum lease payments	5,455
Amounts representing interest	(587)
Total operating lease liabilities	$ 4,868	$ 7,861

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