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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2025 | Jun. 30, 2024
Cash flows from operating activities |  |
Net income (loss) attributable to common stockholders | $ 469 | $ (10,384)
Adjustments to reconcile net income (loss) attributable to common stockholders to net cash used in operating activities: |  |
Accrued final fee |  | 111
Amortization of debt discount | 381 |
Depreciation and amortization | 773 | 798
Amortization of right-of-use asset | 72 | 92
Write-off of patent cost |  | 250
Write-off of inventory | 253 |
Bad debt expense | 9 | 29
Stock-based compensation | 1,391 | 1,949
Foreign currency transaction (gains) losses | (9,192) | 1,970
Changes in operating assets and liabilities |  |
Grants and accounts receivable | 257 | (1,952)
Inventories | (925) | (1,030)
Prepaid expenses and other current assets | 1,897 | 574
Other assets |  | 1
Accounts payable and accrued expenses | (360) | (2,032)
Net cash used in operating activities | (4,975) | (9,624)
Cash flows from investing activities |  |
Purchases of property and equipment | (39) | (63)
Payments for patent costs | (140) | (183)
Net cash used in investing activities | (179) | (246)
Cash flows from financing activities |  |
Proceeds from long-term debt |  | 15,000
Repayment of long-term debt |  | (5,000)
Payment of final fee |  | (150)
Payment of loan costs |  | (640)
Equity contributions - net of fees incurred |  | 53
Proceeds from exercise of common stock warrants | 1,439 |
Proceeds from rights offering, net of fees incurred | 5,392 |
Net cash provided by financing activities | 6,831 | 9,263
Effect of exchange rates on cash | 285 | (64)
Net change in cash, cash equivalents, and restricted cash | 1,962 | (671)
Cash, cash equivalents, and restricted cash at beginning of year | 9,764 | 15,615
Cash, cash equivalents, and restricted cash - end of period | 11,726 | 14,944
Supplemental disclosure of cash flow information |  |
Cash paid for interest | 1,018 | 538
Supplemental disclosure of non-cash financing activities |  |
Warrants issued in connection with long-term debt | $ 556 | $ 691

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