BALANCE SHEET COMPONENTS

3 Months Ended

Mar. 31, 2026

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 $6.6 million and $7.1 million as of March 31, 2026 and December 31, 2025, respectively, included within cash and cash equivalents in the condensed balance sheets.

Short-term Investments

From time-to-time we have held investments in U.S. Treasuries, which are classified as held-to-maturity and measured at amortized cost, which approximates fair value. We have both the intent and the ability to hold these securities to maturity. U.S. Treasuries with original maturities greater than 90 days and less than one year are presented as short-term investments on the condensed balance sheet.

Accounts Receivable, Net

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

Inventory

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

Prepaid Expenses and Other Current Assets

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

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

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

Notes Payable

We have financing arrangements related to the purchase of certain equipment. The notes payable for that certain equipment have a weighted average annual interest rate of 10.4% with original terms of five years and are secured by the underlying equipment.

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