BALANCE SHEET COMPONENTS (Tables)

3 Months Ended

Mar. 31, 2021

Balance Sheet Related Disclosures [Abstract]

Schedule of Property and Equipment, Net

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

	March 31, 2021			December 31, 2020
Prototype	$	17,711		$	17,711
Machinery and equipment		17,587			17,486
Leasehold improvements		14,205			14,196
Furniture and fixtures		1,295			1,295
Software		1,389			1,389
Construction in progress		782			486
Property and equipment, gross		52,969			52,563
Less: accumulated depreciation and amortization		(30,147	)		(28,501	)
Property and equipment, net	$	22,822		$	24,062

Schedule of Accrued Liabilities

Accrued liabilities consisted of the following (in thousands):

	March 31, 2021		December 31, 2020
Accrued payroll and related benefits	$	8,051	$	12,810
Accrued accounts payable		1,945		2,810
Payroll withholding tax, sales and other tax payable		1,271		1,398
Accrued legal, accounting and professional fees		298		305
Product upgrade reserve		2,100		1,500
Other		499		458
Total accrued liabilities	$	14,164	$	19,281

Schedule of Deferred Revenue

Deferred revenue consisted of the following (in thousands):

	March 31, 2021			December 31, 2020
Deferred revenue:
Product	$	1,228		$	1,888
Service		9,081			8,857
Distribution rights		1,802			1,921
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

Schedule of Other Long Term Liabilities

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

	March 31, 2021		December 31, 2020
Accrued interest, noncurrent portion	$	256	$	99
Asset retirement obligation		890		857
Total other-long term liabilities	$	1,146	$	956