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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) | 6 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Operating activities: |  |
Net loss | $ (3,824,000) | $ (25,592,000)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Stock-based compensation expense | 900,000 | 11,589,000
Depreciation | 29,000 | 27,000
Change in the fair value of warrant liability | (7,890,000) | (1,146,000)
Change in the fair value of convertible promissory notes | 0 | (2,022,000)
Transaction costs associated with warrants | 776,000 | 0
Non-cash interest expense | 0 | 110,000
Accretion of discount on short-term investment | (381,000) | (55,000)
Changes in operating assets and liabilities: |  |
Prepaid expenses and other current and non-current assets | (1,004,000) | 1,548,000
Accounts payable | 726,000 | (20,000)
Accrued expenses and other liabilities | (839,000) | (1,986,000)
Net cash used in operating activities | (11,507,000) | (17,547,000)
Investing activities: |  |
Purchase of investments | (17,853,000) | 0
Maturity of investments | 9,850,000 | 14,580,000
Purchases of property and equipment | 0 | (78,000)
Net cash provided by (used in) investing activities | (8,003,000) | 14,502,000
Financing activities: |  |
Proceeds from issuance of common stock, net of issuance costs | 18,983,000 | 10,340,000
Acquisition of stock of Grabug, net of cash | 0 | 14,859,000
Proceeds from exercise of stock options | 4,000 | 0
Merger transaction costs | 0 | (4,546,000)
Proceeds from issuance of common stock from ATM Facility, net of issuance costs | 49,000 | 0
Net cash provided by financing activities | 19,036,000 | 20,653,000
Net increase (decrease) in cash and cash equivalents | (474,000) | 17,608,000
Cashand cash equivalents at beginning of period | 5,530,000 | 1,476,000
Cash and cash equivalents at end of period | 5,056,000 | 19,084,000
Supplemental cash flow information: |  |
Conversion of Series A, B, C-1, C-2 and D convertible preferred stock to common stock | 0 | 62,071,000
Issuance of common stock to Graybug stockholders as a result of the Merger | 0 | 29,218,000
Short-term investments assumed in the Merger | 0 | 9,776,000
Prepaid expenses and other current assets assumed in the Merger | 0 | 2,096,000
Accounts payable and accrued liabilities assumed in the Merger | 0 | 2,258,000
Conversion of C-2 warrants to common stock | 0 | 442,000
Conversion of convertible promissory notes to common stock | 0 | 3,245,000
Conversion of convertible promissory note warrants to common stock | 0 | 841,000
Merger transaction costs in accounts payable | 0 | 1,000
Merger transactions costs in accrued expenses | 0 | 4,000
Financing costs included in accounts payable | 5,000 | 297,000
Reclassification of warrant liability to equity | $ 0 | $ 216,000

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