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Subsequent Event - Additional Information (Detail) - USD ($)
$ in Thousands
Mar. 21, 2019
Feb. 02, 2019
Subsequent Event [Line Items]    
Insurance recovery receivable   $ 50,000
Provision for legal settlement   50,000
Subsequent Event [Member]    
Subsequent Event [Line Items]    
Aggregate settlement amount $ 50,000  
Prepaid Expenses and Other Current Assets [Member]    
Subsequent Event [Line Items]    
Insurance recovery receivable   50,000
Other Current Liabilities [Member]    
Subsequent Event [Line Items]    
Provision for legal settlement   $ 50,000