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Stock-based compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended
--- | --- | ---
Jan. 01, 2025 | Mar. 31, 2025 | Mar. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock options granted (in shares) |  | 0 | 0
Exercised (in shares) |  | 0 |
Aggregate intrinsic value of stock options exercised |  |  | $ 300
Fair value of stock options vested |  | $ 600 | 700
Total stock-based compensation expense |  | 4,050 | $ 3,090
Weighted-average grant date fair value of restricted stock units granted (in dollars per share) |  |  | $ 5.90
Grant date fair value of restricted stock units vested |  |  | $ 1,900
Share-based compensation capitalized |  | 100 | 100
Unrecognized compensation expense |  | $ 24,100 |
Restricted stock units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted-average grant date fair value of restricted stock units granted (in dollars per share) |  | $ 2.99 |
Grant date fair value of restricted stock units vested |  | $ 3,000 |
Restricted stock units | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period |  | 3 years |
Restricted stock units | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period |  | 4 years |
RSU, Initial Awards | Board of Directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period |  | 3 years |
RSU, Annual Awards | Board of Directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period |  | 1 year |
Employee Stock Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation expense |  | $ 100 | $ 200
Unrecognized compensation expense, weighted-average period for recognition |  | 2 years 4 months 24 days |
ESPP |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum shares that may be issued (in shares) |  | 2,329,934 |
Maximum number of shares that may be issued, annual increase percentage |  | 1.00% |
Increase in common stock available for future issuance (in shares) | 358,279 |  |
Annual increase in number of shares that may be issued, term (in years) |  | 10 years |
Maximum number of shares that may be issued, annual increase (in shares) |  | 400,000 |
Maximum percentage of eligible compensation |  | 15.00% |
Purchase price percentage |  | 85.00% |
Common stock shares purchased for issuance under award plan (in shares) |  | 0 | 0
2011 Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration period (in years) |  | 10 years |
Vesting period |  | 48 months |
2011 Plan | Stock Options - New Employees |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration period (in years) |  | 10 years |
Vesting period |  | 4 years |
2011 Plan | Stock Options - New Employees | Vesting Tranche One |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period |  | 1 year |
Vesting percentage |  | 25.00% |
2011 Plan | Stock Options - New Employees | Vesting Tranche Two |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period |  | 36 months |
2021 Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum shares that may be issued (in shares) |  | 4,333,333 |
Maximum shares that may be issued, annual increase, period (in years) |  | 10 years |
Maximum number of shares that may be issued, annual increase percentage |  | 5.00% |
Increase in common stock available for future issuance (in shares) | 1,791,393 |  |
Shares available for future grants (in shares) |  | 2,339,561 |
2021 Plan | Restricted stock units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period |  | 4 years |
Vesting percentage |  | 25.00% |

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