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Supplemental disclosure of cash flow information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Cash Flow Statement [Abstract] |  |
Compensatory shares | $ 693 | $ 1,003
Constrained earn-out receivable on sale of assets | $ 2,000 | $ 0

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- Definition Cash Flow Statement [Abstract] + References No definition available. + Details
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Namespace Prefix: | bldp_
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Balance Type: | na
Period Type: | duration

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- Definition Earn-out Receivable On Sale Of Assets + References No definition available. + Details
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Namespace Prefix: | bldp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Noncash, compensatory shares + References No definition available. + Details
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Namespace Prefix: | bldp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration