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Investments - Financial Information of Weichai Ballard (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Nov. 13, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of joint ventures [line items] |  |  |  |
Trade and other payables |  | $ (21,154) | $ (25,243) |
Foreign exchange |  | (1,078) | 1,692 |
Carrying amount of investment |  | 13,994 | 681 | $ 1,185
Operating expenses |  | 50,472 | 46,477 |
Net loss |  | 27,323 | 8,048 |
Corporate share of net loss |  | $ 1,154 | (201) |
Weichai Ballard JV |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Percentage ownership interest | 49.00% | 49.00% |  |
Net assets |  | $ 13,642 |  |
Incorporation costs |  | 320 | 0 |
Foreign exchange |  | 27 |  |
Carrying amount of investment |  | 13,989 | 0 |
Operating expenses |  | 1,259 |  |
Net loss |  | 1,259 |  |
Corporate share of net loss |  | 617 | $ 0 |
Weichai Ballard JV | Weichai Ballard JV |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Cash |  | 20,107 |  |
Prepaid expenses and other current assets |  | 8,856 |  |
Trade and other payables |  | (1,123) |  |
Net assets |  | $ 27,840 |  |

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