Leases - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Lease cost
Total operating lease cost	$ 6,009	$ 5,159	$ 4,794
Depreciation of leased assets	1,306	1,336	1,348
Interest on lease liabilities	5,086	5,211	5,155
Total finance lease cost	6,392	6,547	6,503
Total lease cost	12,401	11,706	11,297
Short-term lease and variable lease costs	1,900	1,200	900
Service
Lease cost
Total operating lease cost	2,978	2,402	2,315
Research and development
Lease cost
Total operating lease cost	430	491	313
Sales and marketing*
Lease cost
Total operating lease cost	1,605	1,389	1,378
General and administrative*
Lease cost
Total operating lease cost	$ 996	$ 877	$ 788