BALANCE SHEET COMPONENTS (Tables)

9 Months Ended

Sep. 30, 2021

Balance Sheet Related Disclosures [Abstract]

Property and Equipment, Net

Property and equipment, net consisted of the following (in thousands): 

	September 30, 2021		December 31, 2020
Prototype	$	17,730	$	17,711
Machinery and equipment	17,714		17,486
Leasehold improvements	14,041		14,196
Furniture and fixtures	1,295		1,295
Software	1,389		1,389
Construction in progress	187		486
Property and equipment, gross	52,356		52,563
Less: accumulated depreciation and amortization	(32,019)		(28,501)
Property and equipment, net	$	20,337	$	24,062

Schedule of Accrued Liabilities

Accrued liabilities consisted of the following (in thousands):

	September 30, 2021		December 31, 2020
Accrued payroll and related benefits	$	12,472	$	12,810
Accrued accounts payable	2,185		2,810
Payroll withholding tax, sales and other tax payable	597		1,398
Accrued legal, accounting and professional fees	222		305
Product upgrade reserve	2,500		1,500
Other	1,347		458
Total accrued liabilities	$	19,323	$	19,281

Schedule of Deferred Revenue

Deferred revenue consisted of the following (in thousands):

	September 30, 2021		December 31, 2020
Deferred revenue:
Product	$	747	$	1,888
Service	14,827		8,857
Distribution rights	1,564		1,921
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

Other Noncurrent Liabilities

Other long-term liabilities consisted of the following (in thousands):

	September 30, 2021		December 31, 2020
Accrued interest, noncurrent portion	$	556	$	99
Asset retirement obligation	940		857
Other accrued costs	1,020		—
Total other-long term liabilities	$	2,516	$	956