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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Operating activities |  |
Net loss | $ (19,928) | $ (11,188)
Reconciliation of net loss to net cash used in operating activities: |  |
Stock-based compensation expense | 2,754 | 1,220
Right-of-use asset - operating lease | 153 | 142
Other non-cash items | (665) | (26)
Changes in assets and liabilities: |  |
Prepaid expenses and other assets | (930) | (864)
Lease liability - operating lease | (161) | (145)
Accounts payable | (651) | 140
Accrued expenses | 334 | (2,532)
Net cash used in operating activities | (19,094) | (13,253)
Investing activities |  |
Purchases of short-term investments | (1,049,231) | (95,923)
Sales and maturities of short-term investments | 923,000 | 290,920
Purchases of property and equipment |  | (5)
Net cash (used in) provided by investing activities | (126,231) | 194,992
Financing activities |  |
Proceeds from public offering, net of underwriting discounts and issuance costs | 117,172 |
Proceeds from at-the-market offering, net of issuance costs | 20,002 |
Proceeds from exercise of stock options and warrants | 4,633 | 37
Net cash provided by financing activities | 141,807 | 37
Net (decrease) increase in cash, cash equivalents and restricted cash | (3,518) | 181,776
Cash, cash equivalents and restricted cash, beginning of period | 175,693 | 20,688
Cash, cash equivalents and restricted cash, end of period | 172,175 | 202,464
Supplemental disclosure of non-cash transactions: |  |
Conversion of Series X Preferred Stock into common stock |  | $ 1,074
Public offering issuance costs in accounts payable and accrued expenses | $ 280 |

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