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Related party transactions (Tables)
 12 Months Ended
Dec. 31, 2025
Related Party [Abstract]  
Schedule of Transactions Between Related Parties
For the year ended December 31, 2025 and 2024, related party transactions and balances with the Corporation's 49% owned equity accounted investee, Weichai Ballard JV, were as follows:
Balances with related party - Weichai Ballard JV20252024
Trade and other receivables$1,607 $3,447 
Equity-accounted investment— 8,238 
Deferred revenue1,607 1,831 
Transactions during the year with related party - Weichai Ballard JV20252024
Revenues$1,531 $2,480 
Cost of goods sold and operating expenses974 10,997 
Impairment charges on equity-accounted investment4,634 — 
Key management personnel compensation is comprised of:
20252024
Salaries and employee benefits$4,112 $4,587 
Post-employment retirement benefits83 102 
Termination benefits2,892 1,039 
Share-based compensation (note 19)3,638 1,557 
$10,725 $7,285