Balance Sheet Components - Schedule of Deferred Revenue (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Deferred Revenue [Line Items]
Total deferred revenue	$ 17,369	$ 10,433
Less: current portion of deferred revenue	(13,787)	(6,515)
Noncurrent portion of deferred revenue	3,582	3,918
Product
Deferred Revenue [Line Items]
Total deferred revenue	11,950	5,050
Services
Deferred Revenue [Line Items]
Total deferred revenue	1,834	1,561
Distribution Rights
Deferred Revenue [Line Items]
Total deferred revenue	$ 3,585	$ 3,822