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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Cash flows used in operating activities: |  |  |  |
Net loss | $ (44,907) | $ (65,760) | $ (68,538) | $ (76,532)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |  |
Gain on lease termination |  |  | (10) |
Amortization of operating lease asset |  |  | 192 | 186
Accretion on investment discounts |  |  | (951) | (97)
Stock-based compensation | 3,063 | 1,720 | 4,757 | 3,101
Change in fair value of warrant liabilities and fair value of financial instruments issued in excess of proceeds | 31,274 | 56,181 | 44,610 | 56,181
Changes in operating assets and liabilities: |  |  |  |
Prepaid expenses and other assets |  |  | 1,347 | 791
Accounts payable, accrued expenses and other liabilities |  |  | 2,244 | (1,603)
Operating lease liabilities |  |  | (166) | (172)
Net cash used in operating activities |  |  | (16,515) | (18,145)
Cash flows from investing activities: |  |  |  |
Purchase of available-for-sale short-term investments |  |  | (49,230) | (30,334)
Proceeds from maturities of available-for-sale short-term investments |  |  | 39,100 |
Net cash used in investing activities |  |  | (10,130) | (30,334)
Cash flows from financing activities: |  |  |  |
Proceeds from issuances of common stock and pre-funded warrants, net |  |  | 48,072 | 33,017
Net cash provided by financing activities |  |  | 48,072 | 33,017
Net change in cash and cash equivalents |  |  | 21,427 | (15,462)
Cash and cash equivalents at beginning of period |  |  | 4,612 | 56,409
Cash and cash equivalents at end of period | $ 26,039 | $ 40,947 | 26,039 | 40,947
Noncash activities: |  |  |  |
Common stock exchanged for X and X1 non-voting convertible preferred stock |  |  |  | $ 1
Increase in operating lease asset and liability due to new lease |  |  | $ 448 |

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