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Leases - Future minimum lease payments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Rent expense	$ 3,390	$ 2,644	$ 2,160
Operating leases
2022	3,795
2023	3,909
2024	4,027
2025	4,147
2026 and thereafter	1,310
Total lease payments	17,188
Present value adjustment	(3,638)
Present value of lease liabilities	13,550
Finance leases
2022	269
2023	262
2024	141
2025	48
2026 and thereafter	8
Total lease payments	728
Present value adjustment	(40)
Present value of lease liabilities	$ 688

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Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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