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Subsequent Event - Additional Information (Detail) - Subsequent Event - Corporate Restructuring [Member]
$ in Millions
1 Months Ended
Oct. 31, 2018
USD ($)
Subsequent Event [Line Items]  
Restructuring charges $ 2.0
Minimum  
Subsequent Event [Line Items]  
Percentage of global workforce reduction in restructuring 12.00%
Maximum  
Subsequent Event [Line Items]  
Percentage of global workforce reduction in restructuring 15.00%