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Share capital, stock options and other stock-based plans (Tables) | 9 Months Ended
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Sep. 30, 2025
Share-Based Payment Arrangement [Abstract] |
Schedule of Share-based Compensation, Stock Options, Activity | A continuity of the Units issued under the Westport Omnibus Plan are as follows:
|  | Nine months ended September 30, 2025 |  | Nine months ended September 30, 2024
|  | Number of Units |  | Weighted average grant date fair value (CDN $) |  | Number of Units |  | Weighted average grant date fair value (CDN $)
Outstanding, beginning of period |  | 524,322 |  |  | $ | 11.75 |  |  | 478,643 |  |  | $ | 15.68 |
Granted |  | 427,691 |  |  | 3.28 |  |  | 224,050 |  |  | 8.23 |
Exercised |  | (68,071) |  |  | 17.48 |  |  | (90,362) |  |  | 17.58 |
Forfeited/expired |  | (146,457) |  |  | 11.82 |  |  | (54,614) |  |  | 22.15 |
Outstanding, end of period |  | 737,485 |  |  | $ | 6.28 |  |  | 557,717 |  |  | $ | 11.73 |
Units outstanding and exercisable, end of period |  | 491 |  |  | $ | 31.07 |  |  | — |  |  | $ | — |
Schedule of Share Based Compensation Arrangement by Share Based Payment Award Intrinsic Value | The aggregate intrinsic value of the Company’s share units at September 30, 2025 as follows:
|  | September 30, 2025
|  | (CDN $)
Share units: |  |
Outstanding |  | $ | 2,358 |
Exercisable |  | 15 |
Exercised |  | 218 |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs | Stock-based compensation associated with the Unit plans is included in operating expenses as follows:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
Cost of revenue |  | $ | — |  |  | $ | 36 |  |  | $ | — |  |  | $ | 113 |
Research and development |  | 12 |  |  | 53 |  |  | 40 |  |  | 216 |
General and administrative |  | (215) |  |  | (269) |  |  | 465 |  |  | 875 |
Sales and marketing |  | (18) |  |  | 40 |  |  | 10 |  |  | 148 |
|  | $ | (221) |  |  | $ | (140) |  |  | $ | 515 |  |  | $ | 1,352 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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