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Equity-accounted Investments - Narrative (Details) ¥ in Thousands, $ in Thousands	1 Months Ended	12 Months Ended
	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)		Dec. 31, 2022 CNY (¥)
Disclosure of joint ventures [line items]
Equity in loss of investment in joint venture and associates		$ 10,131	$ 11,617	[1]
Synergy Ballard JVCo
Disclosure of joint ventures [line items]
Equity in loss of investment in joint venture and associates		$ 200	18
Proportion of ownership interest in joint venture		10.00%
Weichai Ballard JV
Disclosure of joint ventures [line items]
Equity in loss of investment in joint venture and associates		$ 9,931	$ 11,599
Proportion of ownership interest in joint venture		49.00%	49.00%		49.00%
Contributions (Proceeds)		$ 0	$ 9,272		¥ 62,475
Synergy Ballard JVCo
Disclosure of joint ventures [line items]
Investment fair value cost		$ 0
Past downstream transactions	$ 736
[1] Comparative information has been restated due to a discontinued operation (note 7).

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Past Downstream Transactions

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The cash outflow to acquire interests in joint ventures (other than payments for those instruments considered to be cash equivalents or those held for dealing or trading purposes), classified as investing activities. [Refer: Joint ventures [member]]

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The proportion of ownership interest in a joint venture attributable to the entity. [Refer: Joint ventures [member]]

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The entity's share of the profit (loss) of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Investments accounted for using equity method; Joint ventures [member]; Profit (loss)]

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