Loans payable - Components (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Loans payable
Loan payable, beginning of period	$ 28,941	$ 29,844	$ 29,844
Payments	(881)	(13)
Interest and final fee	0		1,808
Foreign exchange (gain) loss	46		(1,903)
Loan payable, end of period	28,106		28,941
Discount
Discount, beginning of period	(19,459)	$ (17,391)	(17,391)
Interest expense	437		2,483
Non-cash interest income from SIF	0		(5,673)
Foreign exchange (gain) loss	(34)		1,122
Total discount, end of period	(19,056)		(19,459)
Total loans payable	9,050		9,482
Current portion of operating lease liabilities	790		1,671
Loans payable, noncurrent	8,260		7,811
Other notes payable | Venture Loan
Loans payable
Contributions	0		20,000
Payments	0		(21,808)
Other notes payable | Other Loans
Loans payable
Payments	(881)		(1,893)
Other notes payable | Directors and Officers Insurance financing
Loans payable
Contributions	0		2,893
Payments	$ (900)		(1,500)
Other notes payable | TPC Government Loans
Loans payable
Payments			$ (400)