Lease obligation (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Jun. 22, 2022	Jun. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2021
Change in operating lease, right-of-use assets			$ (3,462)	$ (2,606)	$ 7,592
Change in operating lease liabilities			(3,922)	(3,428)	13,439
Gain on termination of lease			2,468
Restricted cash included in deposits and other noncurrent assets			1,515	1,779	1,779
Lease expense			$ 4,600	$ 6,800	$ 6,200
Weighted average remaining lease term			6 years
Weighted average incremental borrowing rate			7.40%
Total minimum lease payments
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]			Other Liabilities, Current	Other Liabilities, Current
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]			Other Liabilities, Noncurrent	Other Liabilities, Noncurrent
75 Sidney Street
Sublease term						3 years 3 months 18 days
Change in operating lease, right-of-use assets	$ (14,500)
Change in operating lease liabilities		$ (17,000)
Gain on termination of lease		$ 2,500
Restricted cash included in deposits and other noncurrent assets			$ 1,500