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Employee benefit plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ESPP weighted average purchase price of shares purchased (usd per share)		$ 0.73	$ 0.68
Unearned stock-based compensation, expected recognition period	1 year 11 months 4 days
Share-based Payment Arrangement, Expense, Tax Benefit		$ 0	$ 0
Stock Issued During Period, Shares, Employee Stock Purchase Plans		400,000	600,000
Stock-based compensation		$ 2,998	$ 5,370
Deferred Bonus
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation		$ 500	$ 200
RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (shares)		104,000
Weighted average price of shares granted (usd per share)		$ 0.81
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (shares)		0
Weighted average price of shares granted (usd per share)		$ 0
Employee Stock Purchase Plan Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase Price of Common Stock, Percent		85.00%
Stock Options, ESPP and Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unearned stock-based compensation costs		$ 11,300
2024 Equity Incentive Plans \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration Period		10 years
2024 Equity Incentive Plans \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period		3 years
2024 Equity Incentive Plans \| Minimum [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period		1 year
2024 Equity Incentive Plans \| Minimum [Member] \| RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period		2 years
2024 Equity Incentive Plans \| Maximum [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period		4 years
2024 Equity Incentive Plans \| Maximum [Member] \| RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period		4 years