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Investments - Narrative (Details) ¥ in Thousands, $ in Thousands |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 13, 2018 | Sep. 26, 2016 | Feb. 28, 2019 CNY (¥) | Feb. 28, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Investments |  |  |  |  | $ 13,994 | $ 681 | $ 1,185
Synergy Ballard JVCo |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Investments |  |  |  |  | $ 0 | 676 | $ 1,185
Capital contribution |  |  |  |  |  | 972 |
Percentage ownership interest |  | 10.00% |  |  | 10.00% |  |
Weichai Ballard JV |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Investments |  |  |  |  | $ 13,989 | 0 |
Capital contribution |  |  |  |  | $ 14,286 | $ 0 |
Percentage ownership interest | 49.00% |  |  |  | 49.00% |  |
Weichai Ballard JV | Capital Contribution |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |
Capital contribution |  |  | ¥ 98,000 | $ 14,500 |  |  |

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- Definition The aggregate cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 39 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_39&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2017-01-01 -Paragraph 24 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2017-03-01&anchor=para_24_a&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph B16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_B16&doctype=Appendix&seq=2 -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_e&doctype=Standard -URIDate 2017-03-09 + Details
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