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Acquisitions - Additional Information (Detail)
$ in Millions
1 Months Ended
Jul. 31, 2018
USD ($)
Business Acquisition [Line Items]  
Intangible assets acquired $ 30
Allocated fair value to purchased intangible asset $ 33
Purchased intangible asset useful life 12 years
Minimum [Member]  
Business Acquisition [Line Items]  
Future contractual obligation to pay a minimum royalty $ 3