BALANCE SHEET COMPONENTS (Tables)

3 Months Ended

Mar. 31, 2026

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of accounts receivable, net and activity in allowance for uncollectible accounts

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

	March 31, 2026		December 31, 2025
Accounts receivable	$	171	$	219
Allowance for uncollectible accounts	(8)		(18)
Accounts receivable, net	$	163	$	201

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

	Three Months Ended March 31,
	2026		2025
Balance as of beginning of period	$	18	$	4
Increase in provision	5		—
Amounts written off, less recoveries	(15)		—
Balance as of end of period	$	8	$	4

Schedule of inventory, net and activity in reserve for obsolescence

Inventory consisted of the following (in thousands):

	March 31, 2026		December 31, 2025
Raw materials	$	747	$	726
Work in progress	1		—
Finished goods	300		268
Total inventory	1,048		994

Schedule of prepaid expenses

Prepaid expenses and other current assets consisted of the following (in thousands):

	March 31, 2026		December 31, 2025
Software licenses	$	126	$	127
Equity offering costs	79		29
Insurance	55		47
Rent	32		32
Marketing programs and conferences	31		25
Professional services	15		14
Other	—		23
Total prepaid expenses and other current assets	$	338	$	297

Schedule of property and equipment, net

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

	March 31, 2026		December 31, 2025
Research and development equipment	$	1,291	$	1,291
Office and computer equipment	84		84
Autos	54		54
Furniture and fixtures	47		47
Leasehold improvements	105		105
Total in service	1,581		1,581
Accumulated depreciation and amortization	(1,202)		(1,171)
Property and equipment, net	$	379	$	410

Schedule of accrued expenses

Accrued expenses consisted of the following (in thousands):

	March 31, 2026		December 31, 2025
Compensation and related benefits	$	428	$	313
Legal and consulting professional services	124		66
Product warranty and other	21		4
Franchise tax	20		—
Total accrued expenses	$	593	$	383

Schedule of maturities of notes payable

As of March 31, 2026, future principal payments were as follows (in thousands):

2026	$	46
2027	68
2028	65
2029	12
Total principal payments	191
Less: current portion of notes payable	(63)
Notes payable, less current portion	$	128