Balance Sheet Components - Schedule of Deferred Revenue (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Deferred Revenue [Line Items]
Total deferred revenue	$ 19,857	$ 14,010
Less: current portion of deferred revenue	(16,788)	(10,457)
Noncurrent portion of deferred revenue	3,069	3,553
Product
Deferred Revenue [Line Items]
Total deferred revenue	9,028	3,141
Service
Deferred Revenue [Line Items]
Total deferred revenue	8,671	8,473
Distribution Rights
Deferred Revenue [Line Items]
Total deferred revenue	$ 2,158	$ 2,396