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Intangible Assets - Narrative (Detail) - Micromidas, Inc. - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Finite-Lived Intangible Assets [Line Items]      
Intangible assets weighted average useful life     9 years 10 months 13 days
Amortization expense $ 0.0 $ 0.0