Balance Sheet Components - Accrued Liabilities (Detail) - USD ($) $ in Thousands	Apr. 01, 2017	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued employee related costs	$ 9,791	$ 25,468
Accrued inventory and other purchases	2,668	1,778
Accrued taxes payable	2,886	1,977
Accrued professional services	798	667
Other accruals	4,347	4,759
Total accrued liabilities	$ 20,490	$ 34,649