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Canadian Government Research and Development Program Liability - Narrative (Detail) - USD ($) $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2019 | Sep. 30, 2021 | Dec. 31, 2020
Research and Development [Abstract] |  |  |
Lesser eligible costs percentage | 22.14% |  |
Lesser eligible costs | $ 23.0 |  |
Funding repayment period | 15 years |  |
Funding reduction percentage | 50.00% |  |
Minimum costs of commercial plants | $ 500.0 |  |
Commercial plants constructed and operational period | 30 months |  |
Funding liability |  | $ 6.5 | $ 6.2

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