BALANCE SHEET COMPONENTS - Schedule of Deferred Revenue (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	$ 16,003	$ 12,666
Less: current portion of deferred revenue	(11,041)	(10,094)
Deferred revenue, net of current portion	4,962	2,572
Product
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	343	1,888
Service
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	13,977	8,857
Distribution Rights
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	$ 1,683	$ 1,921