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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Cash flows from operating activities: |  |
Net loss | $ (24,852) | $ (16,202)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Stock option compensation expense | 6,014 | 3,322
Depreciation expense | 62 | 59
Warrant liability fair value adjustment | 10,367 | (1,160)
Non-cash lease expense | 37 | 195
Amortization of debt discount | 447 | 388
Interest expense accrued related to convertible notes | 80 | 80
Amortization of premiums and discounts on marketable securities | (379) | 0
Changes in operating assets and liabilities: |  |
Prepaid expenses and other assets | (488) | (306)
Accounts receivable | (3,485) | 239
Inventory | (2,994) | (482)
Accounts payable and accrued expenses | 1,339 | 132
Other liabilities, non-current | (183) | (177)
Net cash used in operating activities | (14,035) | (13,912)
Cash flows from investing activities: |  |
Purchase of investment | (20,482) | 0
Maturities of investments | 35,540 | 0
Purchase of property, plant and equipment | (114) | (40)
Net cash provided by (used in) investing activities | 14,944 | (40)
Cash flows from financing activities: |  |
Net proceeds from private placement | 6,771 | 22,960
Proceeds from the issuance of common stock relating to the employee stock purchase plan | 75 | 47
Repayment of debt | (6,107) | (6,313)
Proceeds from exercise of warrants | 259 | 5
Proceeds from exercise of stock options | 169 | 2
Net cash provided by financing activities | 1,167 | 16,701
Foreign currency effects on cash | 10 | 19
Net increase in total cash | 2,086 | 2,768
Total Cash, Cash Equivalents and Restricted Cash: |  |
Beginning of period | 12,696 | 11,822
End of period | 14,782 | 14,590
Cash, Cash Equivalents and Restricted Cash consisted of the following: |  |
Cash and Cash Equivalents | 14,782 | 14,540
Restricted Cash | 0 | 50
Total | 14,782 | 14,590
Cash paid during the periods for: |  |
Interest expense | 375 | 787
Supplemental Disclosure of Non-Cash Investing and Financing Activities: |  |
Right of use assets obtained in exchange for lease obligations | 1,029 | 84
Conversion of mezzanine equity to common shares | 0 | 11,269
Conversion of mezzanine equity to preferred shares | $ 0 | $ 7,099

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