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Share capital, stock options and other stock-based plans (Tables)
 6 Months Ended
Jun. 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:
 Six months ended June 30, 2025Six months ended June 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 period524,322 $11.75 478,643 $15.68 
Granted137,151 3.99 169,835 8.56 
Exercised(68,071)17.48 (83,862)17.93 
Forfeited/expired(117,296)11.36 (38,406)26.07 
Outstanding, end of period476,106 $8.78 526,210 $12.23 
Units outstanding and exercisable, end of period491 $31.07 15,052 $11.41 
Schedule of Share Based Compensation Arrangement by Share Based Payment Award Intrinsic Value
The aggregate intrinsic value of the Company’s share units at June 30, 2025 as follows:
 June 30, 2025
(CDN $)
Share units:
Outstanding$2,578 
Exercisable15 
Exercised285 
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Stock-based compensation associated with the Unit plans is included in operating expenses as follows:
Three Months Ended June 30,Six Months Ended June 30,
 2025202420252024
Cost of revenue$— $36 $— $77 
Research and development15 53 28 163 
General and administrative433 945 680 1,144 
Sales and marketing3 49 28 108 
 $451 $1,083 $736 $1,492