Stockholders' equity - Summary of SARs Activity (Details) - Stock Appreciation Rights - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
SARs Outstanding
Outstanding, beginning balance (in shares)	4,700
Granted (in shares)	0	0
Exercised (in shares)	(1,558)
Canceled (in shares)	(1,142)
Outstanding, ending balance (in shares)	2,000	4,700
Vested and expected to vest, SARs outstanding (in shares)	2,000
Exercisable, SARs outstanding (in shares)	2,000
Weighted Average Exercise Price
Outstanding, beginning balance (in USD per share)	$ 5.11
Granted (in USD per share)	0
Exercised (in USD per share)	6.58
Canceled (in USD per share)	3.55
Outstanding, ending balance (in USD per share)	4.85	$ 5.11
Vested and expected to vest, weighted average exercise price (in USD per shares)	4.85
Exercisable, weighted average exercise price (in USD per share)	$ 4.85
Outstanding, weighted average remaining contractual term	2 years 3 months 25 days	5 years 11 months 23 days
Outstanding, aggregate intrinsic value	$ 7	$ 45
Vested and expected to vest, weighted average remaining contractual term	2 years 3 months 25 days
Vested and expected to vest, aggregate intrinsic value	$ 7
Exercisable, weighted average remaining contractual term	2 years 3 months 25 days
Exercisable, aggregate intrinsic value	$ 7