BALANCE SHEET COMPONENTS (Tables)

6 Months Ended

Jun. 30, 2022

Balance Sheet Related Disclosures [Abstract]

Property and Equipment, Net

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

	June 30, 2022		December 31, 2021
Prototype	$	17,785	$	17,730
Machinery and equipment	19,213		17,701
Leasehold improvements	14,005		14,088
Furniture and fixtures	1,540		1,295
Software	1,389		1,389
Construction in progress	2,074		1,397
Property and equipment, gross	56,006		53,600
Less: accumulated depreciation and amortization	(35,773)		(33,358)
Property and equipment, net	$	20,233	$	20,242

Schedule of Accrued Liabilities

Accrued liabilities consisted of the following (in thousands):

	June 30, 2022		December 31, 2021
Accrued payroll and related benefits	$	9,559	$	17,080
Accrued accounts payable	1,172		3,740
Payroll withholding tax, sales and other tax payable	1,268		1,094
Accrued legal, accounting and professional fees	571		230
Product upgrade reserve	900		2,500
Other	2,467		1,911
Total accrued liabilities	$	15,937	$	26,555

Schedule of Deferred Revenue

Deferred revenue consisted of the following (in thousands):

	June 30, 2022		December 31, 2021
Deferred revenue:
Product	$	1,991	$	1,322
Service	19,461		15,385
Distribution rights	1,208		1,445
Total deferred revenue	22,660		18,152
Less: current portion of deferred revenue	(16,284)		(13,920)
Noncurrent portion of deferred revenue	$	6,376	$	4,232

Other Noncurrent Liabilities

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

	June 30, 2022		December 31, 2021
Accrued interest, noncurrent portion	$	45	$	704
Asset retirement obligation	1,008		962
Other accrued costs	982		981
Total other-long term liabilities	$	2,035	$	2647