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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Dec. 31, 2025
Cash flows from operating activities: |  |  |  |  |  |
Net loss |  |  | $ (17,921) | $ (18,643) |  |
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |  |  |  |
Depreciation | $ 264 | $ 283 | 538 | 512 |  |
Stock-based compensation expense |  |  | 1,550 | 1,492 |  |
Loss on disposal of property and equipment, net |  |  | 6 | 0 |  |
Change in fair value of warrant liabilities | 571 | (46) | 812 | (1,664) |  |
Amortization of debt discount and issuance costs |  |  | 129 |  |  |
Other |  |  | 16 | 15 |  |
Changes in assets and liabilities: |  |  |  |  |  |
Accounts receivable, net |  |  | 1,037 | 899 |  |
Unbilled receivables |  |  | (304) | 457 |  |
Inventory |  |  | 274 | 733 |  |
Prepaid expenses and other current assets |  |  | (669) | (749) |  |
Other long term assets |  |  | 170 | (34) |  |
Accounts payable |  |  | (1,603) | 1,339 |  |
Deferred grant funding |  |  | 349 | 130 |  |
Deferred revenue |  |  | 223 | (230) |  |
Due to related parties |  |  | 11 | (2) |  |
Accrued expenses and other current liabilities |  |  | (897) | (1,404) |  |
Operating lease liabilities, net |  |  | 3 | (10) |  |
Net cash used in operating activities |  |  | (16,276) | (17,159) |  |
Cash flows from investing activities: |  |  |  |  |  |
Purchases of property and equipment |  |  | (272) | (992) |  |
Net cash used in investing activities |  |  | (272) | (992) |  |
Cash flows from financing activities: |  |  |  |  |  |
Proceeds from issuance of debt, net |  |  | 13,641 |  |  |
Proceeds from exercise of stock options |  |  | 254 | 37 |  |
Net cash provided by financing activities |  |  | 25,270 | 6,056 |  |
Net increase (decrease) in cash and cash equivalents and restricted cash |  |  | 8,722 | (12,095) |  |
Cash, cash equivalents and restricted cash, beginning of period |  |  | 36,042 | 37,673 | $ 25,578 |
Cash, cash equivalents and restricted cash, end of period | 44,764 | 25,578 | 44,764 | 25,578 | 44,764 |
Reconciliation of cash, cash equivalents, and restricted cash reported in the balance sheets |  |  |  |  |  |
Cash and cash equivalents | 43,458 | 25,420 | 43,458 | 25,420 | 43,458 | $ 35,085
Restricted cash | 1,306 | 158 | 1,306 | 158 | 1,306 |
Total cash, cash equivalents and restricted cash | $ 44,764 | $ 25,578 | 44,764 | 25,578 | $ 44,764 | $ 36,042
Supplemental disclosure of noncash information: |  |  |  |  |  |
Issuance of warrants in connection with Loan Agreement, net |  |  | 495 |  |  |
Initial measurement of warrant liabilities |  |  |  | 2,858 |  |
Unpaid purchase of property and equipment |  |  | 5 | 86 |  |
Noncash acquisition of fixed assets |  |  | 27 |  |  |
Unpaid debt issuance and financing costs |  |  | 15 | 2 |  |
Class A Common Stock | At-the-market Offering Program |  |  |  |  |  |
Cash flows from financing activities: |  |  |  |  |  |
Gross proceeds from issuance of common stock |  |  | $ 11,375 | 835 |  |
Class A Common Stock | February 2025 Offering |  |  |  |  |  |
Cash flows from financing activities: |  |  |  |  |  |
Gross proceeds from issuance of common stock |  |  |  | $ 5,184 |  |

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