Stockholders' equity - Summary of Stock Option Activity (Details) - 2021 Stock incentive Plan $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2025 USD ($) $ / shares shares	Dec. 31, 2024 USD ($) $ / shares shares
Options Outstanding
Outstanding, beginning balance (in shares) | shares	1,351,086
Granted (in shares) | shares	0
Exercised (in shares) | shares	(353,118)
Canceled (in shares) | shares	(90,609)
Outstanding, ending balance (in shares) | shares	907,359	1,351,086
Vested & expected to vest, awards outstanding (in shares) | shares	907,359
Weighted Average Exercise Price
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 5.28
Granted (in dollars per share) | $ / shares	0
Exercised (in dollars per share) | $ / shares	3.57
Canceled (in dollars per share) | $ / shares	6.50
Outstanding, ending balance (in dollars per share) | $ / shares	5.82	$ 5.28
Vested & expected to vest, weighted average exercise price (in dollars per share) | $ / shares	$ 5.82
Outstanding, weighted average remaining contractual term	3 years 10 months 28 days	4 years 18 days
Outstanding, aggregate intrinsic value | $	$ 1,855	$ 4,666
Vested & expected to vest, weighted average remaining contractual term	3 years 10 months 28 days
Vested & expected to vest, aggregate intrinsic value | $	$ 1,855