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Legal Proceedings - Additional Information (Detail)
$ / shares in Units, $ in Millions
1 Months Ended 9 Months Ended 12 Months Ended
Jul. 16, 2018
$ / shares
Dec. 26, 2017
USD ($)
$ / shares
shares
Feb. 28, 2018
USD ($)
Sep. 30, 2020
LegalMatter
Jul. 15, 2019
shares
Dec. 31, 2017
USD ($)
Sep. 30, 2019
$ / shares
Jun. 29, 2018
USD ($)
Loss Contingencies [Line Items]                
Attorney fees cost and expenses   $ 15.0            
Reserve for settlement of fines           $ 17.1    
Estimated insurance recoveries           15.0    
Non-cash charge for Settlement warrants           $ 2.1    
Reversal of cash settlement from contingent liability               $ 15.0
Settlement Warrants                
Loss Contingencies [Line Items]                
Warrants to purchase of common stock shares | shares   200,000            
Warrants exercisable period 1 year 1 year            
Warrants exercise price | $ / shares $ 30.00 $ 3.00         $ 30.00  
Cash settlement from insurance carriers     $ 15.0          
Warrant expired | shares         200,000      
Warrant expiration date       Jul. 15, 2019        
Warrants exercised during period | shares         0      
Derivative Lawsuits                
Loss Contingencies [Line Items]                
Loss contingency claims filed against company | LegalMatter       2