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Investments - Capital contribution commitments (Details) - Weichai Ballard JV $ in Thousands	Dec. 31, 2018 USD ($)
Disclosure of joint ventures [line items]
Total capital contributions	$ 64,121
Less than 1 year
Disclosure of joint ventures [line items]
Total capital contributions	20,839
1-3 years
Disclosure of joint ventures [line items]
Total capital contributions	34,198
4-5 years
Disclosure of joint ventures [line items]
Total capital contributions	$ 9,084

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- Definition

The commitments that the entity has relating to its joint ventures as specified in paragraphs B18-B20 of IFRS 12. [Refer: Joint ventures [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2017-01-01
-Paragraph 23
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_23_a&doctype=Standard
-URIDate 2017-03-09

+ Details

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Period Type:	instant

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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