Related party transactions - Key Management Compensation (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of transactions between related parties [line items]
Investment fair value cost	$ 13,901	$ 24,026
Maximum obligation, notice period (months)	12 months
Maximum obligation, notice period per each year (months)	1 month
Number of years due to change in control	2 years
Payment equivalent period (months)	24 months
Salaries and employee benefits	$ 3,817	3,416
Post-employment retirement benefits	65	61
Termination benefits	0	247
Share-based compensation	2,622	1,793
Key management personnel compensation	$ 6,504	5,517
Maximum
Disclosure of transactions between related parties [line items]
Maximum obligation, notice period per each year (months)	24 months
Synergy Ballard JVCo
Disclosure of transactions between related parties [line items]
Proportion of ownership interest in joint venture	10.00%
Investment fair value cost	$ 0	$ 0	$ 0

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Key Management Personnel Compensation, Maximum Obligation Notice, Period

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Key Management Personnel Compensation, Maximum Obligation Notice, Period Per Each Year

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Key Management Personnel Compensation, Number Of Years Due To Change In Control

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

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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]]

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The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]]

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The amount of compensation to key management personnel in the form of post-employment benefits. [Refer: Key management personnel of entity or parent [member]]

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The amount of compensation to key management personnel in the form of share-based payments. [Refer: Key management personnel of entity or parent [member]]

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The amount of compensation to key management personnel in the form of short-term employee benefits. [Refer: Key management personnel of entity or parent [member]]

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The amount of compensation to key management personnel in the form of termination benefits. [Refer: Termination benefits expense; Key management personnel of entity or parent [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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