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Unaudited Consolidated Statement of Cash Flows - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Cash flows from operating activities: |  |
Net loss | $ (18,978) | $ (24,642)
Adjustment to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization expense | 1,693 | 705
Stock-based compensation expense | 1,057 | 265
Reduction in the operating right of use assets | 1,360 | 1,329
Amortization of debt discount | 0 | 1,283
Change in fair value of derivative liability | 0 | 84
Accretion on marketable securities | 0 | (163)
Write-off of property and equipment | 67 | 0
Non-cash interest expense | 236 | 41
Changes in operating assets and liabilities: |  |
Prepaid expenses and other assets | (1,572) | (1,623)
Accounts payable | (1,826) | 2,823
Accrued expenses | (2,933) | (4,445)
Deferred revenue | (224) | (323)
Operating lease liabilities | (1,355) | (868)
Other long term liabilities | 50 | 0
Net cash used in operating activities | (22,425) | (25,534)
Cash flows from investing activities: |  |
Purchase of marketable securities | 0 | (34,460)
Proceeds from the sale of marketable securities | 0 | 31,000
Purchases of property and equipment | (17) | (135)
Net cash used in investing activities | (17) | (3,595)
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 | (1,742)
Proceeds from the issuance of common stock in pre-closing financing | 0 | 30,640
Payment of principal related to finance lease liabilities | (1,319) | (106)
Proceeds from failed sale-leaseback arrangement | 686 | 1,092
Payment of finance liability from failed sale-leaseback arrangement | (303) | (45)
Proceeds from the exercise of stock options | 2 | 0
Sale of common stock under Open Market Sales Agreement, net of issuance costs | 2,286 | 0
Net cash provided by financing activities | 1,352 | 67,742
Net (decrease) increase in cash, cash equivalents and restricted cash | (21,090) | 38,613
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 | 56,515 | 62,807
Supplemental disclosures of cash flow information: |  |
Cash paid for interest | 50 | 45
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 | 4,071
Unrealized gain on marketable securities | 0 | 177
Right-of-use assets obtained in exchange for new operating lease liabilities | 4,337 | 0
Right-of-use assets obtained in exchange for new financing lease liabilities | 2,470 | 0
Property and equipment in accounts payable | $ 59 | $ 49

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