Lease obligation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021	Sep. 30, 2021
Operating lease, right-of-use asset			$ 2,556	$ 1,922
Operating lease liabilities			(2,647)	(1,891)
Restricted cash included in deposits and other noncurrent assets	$ 1,515		1,515		$ 1,779
Lease expense	$ 1,400	$ 1,900	$ 2,800	$ 3,700
Weighted average remaining lease term	6 years 6 months		6 years 6 months
Weighted average incremental borrowing rate	7.40%		7.40%
Total minimum lease payments
Current lease liabilities	$ 2,526		$ 2,526		5,571
Non-current lease liabilities	21,741		21,741		$ 38,608
75 Sidney Street
Lease term						3 years 3 months 18 days
Operating lease, right-of-use asset	14,500
Operating lease liabilities	17,000
Gain on termination of lease	2,500
Restricted cash included in deposits and other noncurrent assets	1,800		1,800
Deposits and other non-current assets | 75 Sidney Street
Restricted cash included in deposits and other noncurrent assets	1,500		1,500
Other current assets | 75 Sidney Street
Restricted cash included in deposits and other noncurrent assets	$ 300		$ 300