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BALANCE SHEET COMPONENTS | 6 Months Ended
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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,
| 2026 |  | 2025 |  | 2026 |  | 2025
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 progress | 1 |  |  | — |
Finished goods | 249 |  |  | 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 costs | 134 |  |  | 29 |
Insurance | 55 |  |  | 47 |
Rent | 32 |  |  | 32 |
Marketing programs and conferences | 12 |  |  | 25 |
Professional services | 15 |  |  | 14 |
Other | 49 |  |  | 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 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 | (1,233) |  |  | (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 services | 3 |  |  | 66 |
Product warranty and other | 11 |  |  | 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 |
2027 |  | 68 |
2028 |  | 65 |
2029 |  | 12 |
Total principal payments |  | 176 |
Less: current portion of notes payable |  | (65) |
Notes payable, less current portion |  | $ | 111 |

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/210/tableOfContent + Details
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