Goodwill and Identified Intangible Assets - Estimated Future Amortization Expense of Purchased Intangible Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
2017 (remaining six months)	$ 4,168
2018	8,336
2019	8,336
2020	3,977
2021	500
Total future amortization expense	25,317	$ 29,231
Cost of Sales [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2017 (remaining six months)	2,590
2018	5,180
2019	5,180
2020	951
2021	0
Total future amortization expense	13,901
Operating Expense [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2017 (remaining six months)	1,578
2018	3,156
2019	3,156
2020	3,026
2021	500
Total future amortization expense	$ 11,416