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Supplemental disclosure of cash flow information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Cash Flow Statement [Abstract]
Compensatory shares	$ 2,505	$ 1,688

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- Definition

Cash Flow Statement [Abstract]

+ References

No definition available.

+ Details

Name:	bldp_CashFlowStatementAbstract
Namespace Prefix:	bldp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Noncash, compensatory shares

+ References

No definition available.

+ Details

Name:	bldp_Noncashcompensatoryshares
Namespace Prefix:	bldp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration