Balance Sheet Components

12 Months Ended

Dec. 31, 2022

Balance Sheet Related Disclosures [Abstract]

BALANCE SHEET COMPONENTS

Accounts Receivable, Net

Accounts receivable consists of the following:


	December 31,
	2022		2021
Accounts receivable, gross	$	10,124	$	8,744
Allowance for doubtful accounts	(77)		(36)
Accounts receivable, net	$	10,047	$	8,708

The following is a summary of the change in our allowance for doubtful accounts:


	Year Ended December 31,
	2022		2021
Balance at beginning of year	$	36	$	41
Additions charged (reductions credited)	41		(5)

Balance at end of year	$	77	$	36

Inventories

Inventories consist of the following:


	December 31,
	2022		2021
Finished goods	$	480	$	461
Work-in-process	1,280		1,008
Inventories	$	1,760	$	1,469

We recorded inventory write-downs of $99 and $488 for the years ended December 31, 2022 and 2021, respectively. The inventory write-downs were for lower of cost or net realizable value and excess and obsolescence exposure. The inventory write-downs were offset by sales of previously written-down inventory of $17 and $9 for the years ended December 31, 2022 and 2021, respectively.

Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consist of current prepaid expenses, deposits, income taxes receivable and other receivables.

Property and Equipment, Net

Property and equipment consists of the following:


	December 31,
	2022		2021
Equipment, furniture and fixtures	$	9,637	$	9,463
Tooling	2,903		5,749
Software	6,739		5,230
Leasehold improvements	1,513		1,375
	20,792		21,817
Accumulated depreciation and amortization	(16,160)		(16,161)
Property and equipment, net	$	4,632	$	5,656

Software amortization was $1,505 and $1,214 for the years ended December 31, 2022 and 2021, respectively. Depreciation and amortization expense for equipment, furniture, fixtures, tooling and leasehold improvements was $2,620 and $2,281 for the years ended December 31, 2022 and 2021, respectively.

Other Assets, Net

Other assets consist primarily of deposits, deferred tax assets and licensed technology. Amortization of licensed technology was $532 and $153 for the years ended December 31, 2022 and 2021, respectively.

Acquired Intangible Assets, Net

In connection with the Acquisition, we recorded certain identifiable intangible assets. Acquired intangible assets resulting from this transaction consist of the following:


	December 31,
	2022		2021
Developed technology	$	5,050	$	5,050
Customer relationships	1,270		1,270
Backlog and tradename	410		410
	6,730		6,730
Less: accumulated amortization	(6,730)		(6,640)
Acquired intangible assets, net	$	—	$	90

Developed technology and customer relationships were fully amortized as of March 31, 2022, tradename was fully amortized as of March 31, 2019 and backlog was fully amortized as of September 30, 2018.

Amortization expense for intangible assets was $90 for the year ended December 31, 2022, $72 was included in cost of revenue and $18 was included in selling, general and administrative for the year ended December 31, 2022, in the condensed consolidated statements of operations.

Goodwill

Goodwill resulted from the Acquisition, whereby we recorded goodwill of $18,407. See Note 2: "Summary of Significant Accounting Policies" for information on our assessment of goodwill impairment.

Accrued Liabilities and Current Portion of Long-Term Liabilities

Accrued liabilities and current portion of long-term liabilities consist of the following:


	December 31,
	2022		2021
Accrued payroll and related liabilities	$	3,632	$	3,490
Operating lease liability, current	1,391		2,439
Current portion of accrued liabilities for asset financings	876		1,077
Accrued interest payable	246		361
Deferred revenue	230		50
Accrued commissions and royalties	210		259
Liability for warranty returns	15		—
Deferred research and development reimbursement	—		1,838

Other	2,249		4,049
Accrued liabilities and current portion of long-term liabilities	$	8,849	$	13,563

The following is a summary of the change in deferred revenue:


	Year Ended December 31,
	2022		2021
Deferred revenue:
Balance at beginning of period	$	50	$	179
Revenue recognized	(1,474)		(1,127)
Revenue deferred	1,654		998
Balance at end of period	$	230	$	50