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Property, Plant and Equipment - Narrative (Detail) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Property, Plant and Equipment [Abstract]      
Depreciation expense $ 0.1 $ 0.1  
Capitalized interest cost 0.9   $ 0.7
Cumulative translation adjustment $ 1.2   $ 0.9