BALANCE SHEET COMPONENTS

6 Months Ended

Jun. 30, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

BALANCE SHEET COMPONENTS

BALANCE SHEET COMPONENTS

Cash and Cash Equivalents

Highly liquid investments with maturities of three months or less as of the date of acquisition are classified as cash equivalents, of which we had $2.2 million and $4.8 million as of June 30, 2023 and December 31, 2022, respectively, included within cash and cash equivalents in the condensed balance sheets.

Accounts Receivable, Net

Accounts receivable, net consisted of the following (in thousands):

	June 30, 2023		December 31, 2022
Accounts receivable	$	48	$	119
Allowance for uncollectible accounts	(4)		(6)
Accounts receivable, net	$	44	$	113

The following was the activity in the allowance for uncollectible accounts (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
Balance as of beginning of period	$	4	$	—	$	6	$	—
Increase in provision	—		12		—		12
Amounts written off, less recoveries	—		—		(2)		—
Balance as of end of period	$	4	$	12	$	4	$	12

Inventory, net

Inventory, net consisted of the following (in thousands):

	June 30, 2023		December 31, 2022
Raw materials	$	729	$	772
Finished goods	54		99
Total inventory	783		871
Less: reserve for obsolescence	(18)		(18)
Inventory, net	$	765	$	853

The following was the activity in the reserve for obsolescence (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
Balance as of beginning of period	$	18	$	26	$	18	$	29
Increase in reserve	—		—		—		—
Amounts relieved	—		(4)		—		(7)
Balance as of end of period	$	18	$	22	$	18	$	22

Prepaid Expenses

Prepaid expenses consisted of the following (in thousands):

	June 30, 2023		December 31, 2022
Professional services	$	107	$	41
Insurance	97		61
Software licenses	94		157
Other	14		6
Patents	10		39
Marketing programs and conferences	8		74
Total prepaid expenses	$	330	$	378

Property and Equipment, Net

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

	June 30, 2023		December 31, 2022
Research and development equipment	$	1,569	$	1,558
Office and computer equipment	803		800
Autos	54		54
Furniture and fixtures	41		41
Leasehold improvements	119		119
Total in service	2,586		2,572
Accumulated depreciation and amortization	(2,353)		(2,283)
Total in service, net	233		289
Construction in progress	12		5
Property and equipment, net	$	245	$	294

Accrued Expenses

Accrued expenses consisted of the following (in thousands):

	June 30, 2023		December 31, 2022
Compensation, severance and related benefits	$	468	$	497
Legal services	138		36
Product warranty	15		18
Personal property and franchise tax	—		6
Other	—		3
Total accrued expenses	$	621	$	560