BALANCE SHEET COMPONENTS - Schedule of Deferred Revenue (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Deferred Revenue [Line Items]
Total deferred revenue	$ 12,111	$ 12,666
Less: current portion of deferred revenue	(10,022)	(10,094)
Noncurrent portion of deferred revenue	2,089	2,572
Product
Deferred Revenue [Line Items]
Total deferred revenue	1,228	1,888
Service
Deferred Revenue [Line Items]
Total deferred revenue	9,081	8,857
Distribution Rights
Deferred Revenue [Line Items]
Total deferred revenue	$ 1,802	$ 1,921