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Condensed Statements of Cash Flows (unaudited) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 31, 2025 | Sep. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Cash flows from operating activities |  |  |  |  |  |  |  |
Net loss |  | $ (3,496) | $ (6,589) | $ (5,452) | $ (8,925) | $ (18,736) | $ (21,891) |
Adjustments to reconcile net loss to net cash used in operating activities |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  | 8,482 | 7,679 |
Depreciation |  | 100 |  | 100 |  | 158 | 159 |
Amortization of debt discount and issuance costs |  |  |  |  |  | 174 | 179 |
Non-cash interest expense |  |  |  |  |  | 463 | 743 |
Loss on debt extinguishment |  |  |  |  |  | 527 | 0 |
PIK interest incurred but not paid on term loan |  |  |  |  |  | 0 | 1,389 |
Amortization of right-of-use asset |  |  |  |  |  | 1,268 | 1,159 |
Gain on short-term investments |  |  |  |  |  | (41) | (315) |
Inventory write-downs |  |  |  |  |  | 140 | 196 |
Loss on disposal of property and equipment |  |  |  |  |  | 2 | 0 |
Changes in operating assets and liabilities |  |  |  |  |  |  |  |
Accounts receivable |  |  |  |  |  | (2,087) | 753 |
Inventory |  |  |  |  |  | (4,894) | (1,066) |
Prepaid expenses and other assets |  |  |  |  |  | 134 | 621 |
Accounts payable |  |  |  |  |  | 1,655 | (102) |
Accrued liabilities |  |  |  |  |  | 2,530 | (1,108) |
Deferred revenue |  |  |  |  |  | 93 | (341) |
Operating lease liabilities |  |  |  |  |  | (1,380) | (1,207) |
Net cash used in operating activities |  |  |  |  |  | (11,512) | (13,152) |
Cash flows from investing activities |  |  |  |  |  |  |  |
Acquisition of property and equipment |  |  |  |  |  | (235) | (267) |
Proceeds from sale of short-term investments |  |  |  |  |  | 0 | 7,300 |
Net cash (used in) provided by investing activities |  |  |  |  |  | (235) | 7,033 |
Cash flows from financing activities |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  | (49,546) | 0 |
Proceeds from issuance of common stock under employee plans |  |  |  |  |  | 1,152 | 1,336 |
Taxes withheld and paid related to net share settlement of equity awards |  |  |  |  |  | (455) | (789) |
Net cash provided by financing activities |  |  |  |  |  | 18,965 | 3,479 |
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  | 7,218 | (2,640) |
Cash, cash equivalents and restricted cash |  |  |  |  |  |  |  |
Beginning of the period | $ 13,552 |  | $ 13,552 |  | $ 18,180 | 13,552 | 18,180 | $ 18,180
End of the period |  | 20,770 |  | 15,540 |  | 20,770 | 15,540 | 13,552
Reconciliation of cash, cash equivalents and restricted cash to balance sheets: |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 20,648 |  | 15,418 |  | 20,648 | 15,418 | 13,430
Restricted cash |  | 122 |  | 122 |  | 122 | 122 | 122
Cash, cash equivalents and restricted cash in balance sheets |  | $ 20,770 |  | $ 15,540 |  | 20,770 | 15,540 | 13,552
Supplemental disclosure of cash flow information: |  |  |  |  |  |  |  |
Cash paid for interest |  |  |  |  |  | 4,735 | 4,294 |
Supplemental disclosures of non-cash investing and financing information: |  |  |  |  |  |  |  |
Deferred offering costs offset against additional paid-in capital |  |  |  |  |  | 277 | 99 |
Purchase of property and equipment included in accounts payable |  |  |  |  |  | 1 | 0 |
Net change in accrued liabilities from early exercise of options |  |  |  |  |  | 0 | (1) |
Follow-on Offering |  |  |  |  |  |  |  |
Cash flows from financing activities |  |  |  |  |  |  |  |
Proceeds from issuance of stock |  |  |  |  |  | 69,654 | 0 |
At-the-Market Equity Offering |  |  |  |  |  |  |  |
Cash flows from financing activities |  |  |  |  |  |  |  |
Proceeds from issuance of stock | $ 200 |  |  |  |  | 232 | 2,932 | $ 3,400
Proceeds from debt, net of discounts and issuance costs |  |  |  |  |  | 58,435 | 0 |
Repayment of debt |  |  |  |  |  | $ (60,507) | $ 0 |

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