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Intangible assets (Tables)
 12 Months Ended
Dec. 31, 2018
Intangible Assets [Abstract]  
Disclosure of detailed information about intangible assets
 
December 31, 2018

 
December 31, 2017

Intellectual property acquired from UTC
$
1,417

 
$
1,864

Intellectual property acquired from H2 Logic A/S
43

 
129

Intellectual property acquired from Protonex
787

 
8,507

Internally generated fuel cell intangible assets
1,199

 
1,690

ERP management reporting software system
4,825

 
5,738

Intellectual property acquired by Ballard Power Systems Europe
14

 
22

 
$
8,285

 
$
17,950
Disclosure of reconciliation of changes in intangible assets
Intangible assets
 
 
Accumulated

 
Net carrying

Balance
Cost

 
amortization

 
amount

At January 1, 2017
$
66,171

 
$
48,088

 
$
18,083

Additions to and acquisition of intangible assets
3,376

 
—

 
3,376

Amortization expense
—

 
2,309

 
(2,309
)
Impairment charges (note 28)
—

 
1,200

 
(1,200
)
At December 31, 2017
69,547

 
51,597

 
17,950

Amortization expense
—

 
2,354

 
(2,354
)
Disposals
(9,138
)
 
(1,827
)
 
(7,311
)
At December 31, 2018
$
60,409

 
$
52,124

 
$
8,285