BALANCE SHEET COMPONENTS

3 Months Ended

Mar. 31, 2022

Balance Sheet Related Disclosures [Abstract]

BALANCE SHEET COMPONENTS

BALANCE SHEET COMPONENTS

Property and Equipment, Net

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

	March 31, 2022		December 31, 2021
Prototype	$	17,730	$	17,730
Machinery and equipment	17,701		17,701
Leasehold improvements	14,088		14,088
Furniture and fixtures	1,295		1,295
Software	1,389		1,389
Construction in progress	2,755		1,397
Property and equipment, gross	54,958		53,600
Less: accumulated depreciation and amortization	(34,601)		(33,358)
Property and equipment, net	$	20,357	$	20,242

Depreciation and amortization expense related to property and equipment was $1.2 million and $1.5 million during the three months ended March 31, 2022 and 2021, respectively.

Accrued Liabilities

Accrued liabilities consisted of the following (in thousands):

	March 31, 2022		December 31, 2021
Accrued payroll and related benefits	$	7,760	$	17,080
Accrued accounts payable	4,420		3,740
Payroll withholding tax, sales and other tax payable	1,044		1,094
Accrued legal, accounting and professional fees	1,354		230
Product upgrade reserve	2,500		2,500
Other	1,349		1,911
Total accrued liabilities	$	18,427	$	26,555

Deferred Revenue

Deferred revenue consisted of the following (in thousands):

	March 31, 2022		December 31, 2021
Deferred revenue:
Product	$	1,721	$	1,322
Service	18,338		15,385
Distribution rights	1,327		1,445
Total deferred revenue	21,386		18,152
Less: current portion of deferred revenue	(13,879)		(13,920)
Noncurrent portion of deferred revenue	$	7,507	$	4,232

Other Long-Term Liabilities

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

	March 31, 2022		December 31, 2021
Accrued interest, noncurrent portion	$	865	$	704
Asset retirement obligation	985		962
Other accrued costs	981		981
Total other-long term liabilities	$	2,831	$	2,647