Loans payable, net - Components (Details) - USD ($) $ in Thousands		12 Months Ended
	Aug. 05, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Loans payable
Loan payable, beginning of period		$ 29,844	$ 13,624
Contributions		0	16,786
Payments		(21,511)	(31)	$ 0
Interest and final fee on Venture Loan		1,808	0
Foreign exchange (gain) loss		(1,903)	(167)
Loan payable, end of period		28,941	29,844	13,624
Discount
Discount, beginning of period		(17,391)	(11,948)
SIF discount on additional contribution		0	(7,167)
Interest expense		2,483	1,728
Non-cash interest income from SIF		(5,673)	0
Foreign exchange (gain) loss		1,122	(4)
Discount, end of period		(19,459)	(17,391)	$ (11,948)
Total loans payable, net		9,482	12,453
Current portion of long term debt, net		1,671	220
Loans payable, net, noncurrent		7,811	12,233
Other notes payable | Financing of Directors and Officers Insurance
Loans payable
Contributions		2,893	0
Payments		(1,500)
Discount
Total loans payable, net		1,400
Other notes payable | Venture Loan
Loans payable
Contributions		20,000	0
Payments	$ (21,800)	(21,808)	0
Other notes payable | Other Loans
Loans payable
Payments		(1,893)	(399)
Other notes payable | TPC Government Loans
Loans payable
Payments		$ (400)	$ (400)