Warrant liabilities - Summary of outstanding warrants (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Class of Warrant or Right [Roll Forward]
Fair Value Adjustments	$ 5,321	$ (9,493)
Exercise Period	5 years
Warrant liabilities
Class of Warrant or Right [Roll Forward]
Beginning balance (in shares)	22,200,731
Beginning balance	$ 669
Fair Value Adjustments	$ 5,321
Ending balance (in shares)	22,200,731
Ending balance	$ 5,990
Outstanding warrants (in shares)	22,200,731
5-Year Private Warrants
Class of Warrant or Right [Roll Forward]
Beginning balance (in shares)	9,478,830
Beginning balance	$ 664
Fair Value Adjustments	$ 5,308
Ending balance (in shares)	9,478,830
Ending balance	$ 5,972
Warrants, exercise price (in dollars per share)	$ 11.50
Exercise Period	5 years
Outstanding warrants (in shares)	9,478,830
Seller Warrants
Class of Warrant or Right [Roll Forward]
Beginning balance (in shares)	12,721,901
Beginning balance	$ 5
Fair Value Adjustments	$ 13
Ending balance (in shares)	12,721,901
Ending balance	$ 18
Warrants, exercise price (in dollars per share)	$ 40.31
Exercise Period	7 years
Outstanding warrants (in shares)	12,721,901