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Consolidated Statements of Cash Flows - USD ($) | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2023 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Cash flows used in operating activities: |  |  |  |
Net loss | $ (76,532,000) | $ (86,438,000) | $ (116,537,000) | $ (87,966,000)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |  |
Amortization of operating lease asset |  |  | 374,000 | 373,000
Accretion on investment discounts |  |  | (1,203,000) |
Goodwill impairment |  |  | 0 | 48,648,000
Stock-based compensation |  |  | 6,545,000 | 8,153,000
Change in fair value of warrant liabilities and fair value of financial instruments issued in excess of proceeds | 56,181,000 | 55,738,000 | 76,211,000 |
Changes in operating assets and liabilities: |  |  |  |
Prepaid expenses and other assets |  |  | (1,954,000) | 654,000
Accounts payable, accrued expenses and other liabilities |  |  | (2,600,000) | 2,081,000
Operating lease liabilities |  |  | (363,000) | (367,000)
Net cash used in operating activities | (18,145,000) | (30,396,000) | (39,527,000) | (28,424,000)
Cash flows from investing activities: |  |  |  |
Purchase of available-for-sale short-term investments |  |  | (78,287,000) |
Proceeds from maturities of available-for-sale short-term investments |  |  | 33,000,000 |
Net cash used in investing activities |  |  | (45,287,000) |
Cash flows from financing activities: |  |  |  |
Proceeds from issuances of common stock and pre-funded warrants, net |  |  | 33,017,000 |
Net cash used in financing activities |  |  | 33,017,000 |
Net change in cash and cash equivalents |  |  | (51,797,000) | (28,424,000)
Cash and cash equivalents at beginning of year | $ 56,409,000 | $ 56,409,000 | 56,409,000 | 84,833,000
Cash and cash equivalents at end of year |  |  | 4,612,000 | 56,409,000
Non-cash activities: |  |  |  |
Common stock exchanged for X and X1 non-voting convertible preferred stock |  |  | $ 1,000 | 1,000
Increase in operating lease asset and liability due to lease modification |  |  |  | $ 344,000

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