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Property, Plant and Equipment - Schedule of Property Plant and Equipment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 57,321 $ 52,146
Less accumulated depreciation and amortization (7,370) (7,042)
Total property, plant, and equipment, net 49,951 45,104
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 222 39
Pilot plant    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 5,476 5,237
Lab equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 2,167 1,958
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 655 655
Computer and other equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 330 295
Construction in process    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 48,471 $ 43,962