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Unaudited Consolidated Statement of Cash Flows - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Cash flows from operating activities: |  |
Net loss | $ (30,140) | $ (44,518)
Adjustment to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization expense | 1,948 | 1,420
Stock-based compensation expense | 1,682 | 595
Reduction in the operating right of use assets | 4,565 | 2,683
Amortization of debt discount | 0 | 1,283
Change in fair value of derivative liability | 0 | 84
Accretion on marketable securities | 0 | (569)
Write-off of property and equipment | 67 | 0
Non-cash interest expense | 159 | 68
Changes in operating assets and liabilities: |  |
Prepaid expenses and other assets | (7,493) | (1,210)
Accounts payable | (1,900) | 659
Accrued expenses | 1,580 | (1,618)
Deferred revenue | (4,504) | (1,043)
Operating lease liabilities | (4,614) | (1,915)
Other liabilities | 105 | 0
Net cash used in operating activities | (38,545) | (44,081)
Cash flows from investing activities: |  |
Purchase of marketable securities | 0 | (34,460)
Proceeds from the sale of marketable securities | 0 | 67,000
Purchases of property and equipment | (123) | (382)
Net cash (used in) provided by investing activities | (123) | 32,158
Cash flows from financing activities: |  |
Cash, cash equivalents and restricted cash acquired in connection with the reverse recapitalization | 0 | 37,903
Payment of reverse recapitalization finance costs | 0 | (5,202)
Proceeds from the issuance of common stock in pre-closing financing | 0 | 30,640
Payment of principal related to finance lease liabilities | (906) | (213)
Proceeds from failed sale-leaseback arrangement | 686 | 1,020
Payment of finance liability from failed sale-leaseback arrangement | (645) | (88)
Proceeds from the exercise of stock options | 4 | 52
Sale of common stock under Open Market Sales Agreement | 2,286 | 0
Net cash provided by financing activities | 1,425 | 64,112
Net (decrease) increase in cash, cash equivalents and restricted cash | (37,243) | 52,189
Cash, cash equivalents and restricted cash at beginning of the period | 77,605 | 24,194
Cash, cash equivalents and restricted cash at end of the period | 40,362 | 76,383
Supplemental disclosures of cash flow information: |  |
Cash paid for interest | 105 | 88
Supplemental disclosure of non-cash financing and investing activities: |  |
Conversion of convertible preferred stock and non-controlling interests upon Merger | 0 | 122,204
Conversion of convertible promissory note, accrued interest and derivative liability upon Merger | 0 | 42,447
Reverse recapitalization costs in accrued expenses | 0 | 611
Unrealized gain on marketable securities | 0 | 306
Deferred financing costs in accounts payable | 0 | 86
Deferred financing costs in accrued expenses | 0 | 60
Reclassification of deferred financing costs to additional paid-in capital | 4 | 0
Right-of-use assets obtained in exchange for new operating lease liabilities | 4,337 | 908
Right-of-use assets obtained in exchange for new financing lease liabilities | $ 1,660 | $ 0

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