Stockholders' equity - Summary of SARs Activity (Details) - Stock Appreciation Rights - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
SARs Outstanding
Outstanding, beginning balance (in shares)	106,155
Granted (in shares)	0
Exercised (in shares)	(743)
Canceled in connection with the Equity Exchange (in shares)	(21,055)
Canceled (in shares)	(2,587)
Outstanding, ending balance (in shares)	81,770	106,155
Vested and expected to vest, SARs outstanding (in shares)	81,770
Exercisable, SARs outstanding (in shares)	66,325
Weighted Average Exercise Price
Outstanding, beginning balance (in USD per share)	$ 8.45
Granted (in USD per share)	0
Exercised (in USD per share)	3.63
Canceled in connection with the Equity Exchange (in USD per share)	19.19
Canceled (in USD per share)	12.63
Outstanding, ending balance (in USD per share)	5.44	$ 8.45
Vested and expected to vest, weighted average exercise price (in USD per shares)	5.44
Exercisable, weighted average exercise price (in USD per share)	$ 5.21
Outstanding, weighted average remaining contractual term	6 years 10 months 24 days	8 years 3 months
Outstanding, aggregate intrinsic value	$ 418	$ 1,267
Vested and expected to vest, weighted average remaining contractual term	6 years 10 months 24 days
Vested and expected to vest, aggregate intrinsic value	$ 418
Exercisable, weighted average remaining contractual term	6 years 9 months 21 days
Exercisable, aggregate intrinsic value	$ 354