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Stock-based compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 01, 2026 | Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock options granted (in shares) |  | 0 | 0 | 0 | 0
Aggregate intrinsic value of stock options exercised |  | $ 100 |  | $ 100 |
Exercised (in shares) |  |  | 0 | 9,351 | 0
Fair value of stock options vested |  | 100 | $ 300 | $ 300 | $ 1,000
Total stock-based compensation expense |  | 3,002 | 3,542 | 5,993 | 7,592
Share-based compensation capitalized |  | 100 | $ 100 | 100 | $ 100
Unrecognized compensation expense |  | $ 19,000 |  | $ 19,000 |
2011 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expiration period (in years) |  |  |  | 10 years |
Vesting period |  |  |  | 48 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 |  | 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) | 1,842,415 |  |  |  |
Shares available for future grants (in shares) |  | 1,951,086 |  | 1,951,086 |
Stock Options - New Employees | 2011 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expiration period (in years) |  |  |  | 10 years |
Vesting period |  |  |  | 4 years |
Stock Options - New Employees | 2011 Plan | Vesting Tranche One |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  |  | 1 year |
Vesting percentage |  |  |  | 25.00% |
Stock Options - New Employees | 2011 Plan | Vesting Tranche Two |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  |  | 36 months |
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) |  | $ 4.21 | $ 2.66 | $ 5.24 | $ 2.96
Grant date fair value of restricted stock units vested |  | $ 3,200 | $ 4,200 | $ 5,700 | $ 7,100
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 |
Restricted stock units | 2021 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  |  | 4 years |
Vesting percentage |  |  |  | 25.00% |
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] |  |  |  |  |
Unrecognized compensation expense, weighted-average period for recognition |  |  |  | 2 years 3 months 18 days |
ESPP |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Maximum shares that may be issued (in shares) |  | 2,698,417 |  | 2,698,417 |
Maximum number of shares that may be issued, annual increase percentage |  |  |  | 1.00% |
Increase in common stock available for future issuance (in shares) | 368,483 |  |  |  |
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% |  | 15.00% |
Purchase price percentage |  |  |  | 85.00% |
Common stock shares purchased for issuance under award plan (in shares) |  | 0 | 0 | 0 | 0

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