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Intangible Assets - Schedule of Intangible Assets (Detail) - Micromidas, Inc. - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Patents $ 431 $ 430
Less accumulated amortization (206) (172)
Intangible assets, net $ 225 $ 258