BALANCE SHEET COMPONENTS - Schedule of Deferred Revenue (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	$ 17,138	$ 12,666
Less: current portion of deferred revenue	(12,468)	(10,094)
Noncurrent portion of deferred revenue	4,670	2,572
Product
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	747	1,888
Service
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	14,827	8,857
Distribution rights
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	$ 1,564	$ 1,921