v3.8.0.1
Financial Statement Details - Inventory (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2017
Raw materials $ 20.1 $ 20.0
Work-in-process 2.3 8.2
Finished goods 23.0 17.0
Total 45.4 $ 45.2
Customer Notification Related Inventory Reserve [Member]    
Inventory Write-down $ 3.5