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BALANCE SHEET COMPONENTS
 6 Months Ended
Jun. 30, 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 $4.9 million and $7.1 million as of June 30, 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):
June 30,
2026		December 31,
2025
Accounts receivable$363 $219 
Allowance for uncollectible accounts(2)(18)
Accounts receivable, net$361 $201 
The following was the activity in the allowance for uncollectible accounts (in thousands):
Three Months Ended
June 30,		Six Months Ended
June 30,
2026202520262025
Balance as of beginning of period$8 $4 $18 $4 
Increase in provision— 6 5 6 
Amounts written off, less recoveries(6)— (21)— 
Balance as of end of period$2 $10 $2 $10 
Inventory
Inventory consisted of the following (in thousands):
June 30,
2026		December 31,
2025
Raw materials$719 $726 
Work in progress1 — 
Finished goods249 268 
Total inventory$969 $994 
Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets consisted of the following (in thousands):
June 30,
2026		December 31,
2025
Software licenses$76 $127 
Equity offering costs134 29 
Insurance55 47 
Rent32 32 
Marketing programs and conferences12 25 
Professional services15 14 
Other49 23 
Total prepaid expenses and other current assets$373 $297 
Property and Equipment, Net
Property and equipment, net consisted of the following (in thousands):
June 30,
2026		December 31,
2025
Research and development equipment$1,291 $1,291 
Office and computer equipment84 84 
Autos54 54 
Furniture and fixtures47 47 
Leasehold improvements105 105 
Total in service1,581 1,581 
Accumulated depreciation and amortization(1,233)(1,171)
Property and equipment, net$348 $410 
Accrued Expenses
Accrued expenses consisted of the following (in thousands):
June 30,
2026		December 31,
2025
Compensation and related benefits$450 $313 
Legal and consulting professional services3 66 
Product warranty and other11 4 
Total accrued expenses$464 $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 June 30, 2026, future principal payments were as follows (in thousands):
2026$31 
202768 
202865 
202912 
Total principal payments176 
Less: current portion of notes payable(65)
Notes payable, less current portion$111