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Intangible Assets, Net - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Aug. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2020
Jul. 31, 2020
Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]                
Cost of sales - amortization of intangible assets   $ 0 $ 2,300 $ 2,500 $ 6,894      
Accounts and other receivables, net   35,023   35,023       $ 8,886
Selling, general and administrative   21,538 $ 18,459 61,418 $ 54,668      
Asset Purchase Agreement                
Finite Lived Intangible Assets [Line Items]                
Upfront payment receivable             $ 5,000  
Gain on sale of assets   6,900            
Accounts and other receivables, net   4,000   4,000        
Selling, general and administrative   2,500            
Asset Purchase Agreement | Symphony Dynamo Holdings Llc                
Finite Lived Intangible Assets [Line Items]                
Additional milestone payments receivable   $ 250,000   $ 250,000        
Amount paid to third party $ 2,500              
Asset Purchase Agreement | Forecast                
Finite Lived Intangible Assets [Line Items]                
Upfront payment receivable           $ 4,000