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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Cash flows from operating activities: |  |
Net loss | $ (26,949) | $ (22,781)
Adjustments to reconcile net loss to net cash used in operations: |  |
Depreciation and amortization | 26 | 25
Stock-based compensation | 4,058 | 1,024
Noncash lease expense | 142 | 84
Changes in operating assets and liabilities: |  |
Prepaid expenses and other current assets | (4,112) | (908)
Accounts payable | (7,360) | (10,750)
Accrued expenses | 671 | (2,084)
Operating lease liabilities | (75) | (76)
Net cash used in operating activities | (33,599) | (35,466)
Cash flow from investing activities: |  |
Purchases of property and equipment | (67) | (29)
Net cash used in investing activities | (67) | (29)
Cash flow from financing activities: |  |
Proceeds from sale of common stock in offerings, net of issuance costs paid | 0 | 34,217
Proceeds from sale of pre-funded warrants in offerings, net of issuance costs paid | 0 | 28,262
Proceeds from sale of common stock in at-the-market offerings, net of issuance costs paid | 14,849 | 14,605
Proceeds from stock option exercises | 806 | 222
Contributions from employee stock purchase plan | 245 | 0
Net cash provided by financing activities | 15,900 | 77,306
Net increase (decrease) in cash, cash equivalents and restricted cash | (17,766) | 41,811
Cash, cash equivalents and restricted cash, beginning of period | 360,616 | 194,788
Cash, cash equivalents and restricted cash, end of period | 342,850 | 236,599
Supplemental cash flow information |  |
Cash paid for income taxes | 0 | 0
Supplemental disclosure of non-cash activities |  |
Purchases of property and equipment included in accounts payable and accrued expenses | 0 | 8
Receivable for proceeds from stock option exercises included in other current assets | 0 | 845
Deferred issuance costs on sale of common stock and pre-funded warrants in offerings included in accounts payable and accrued expenses | $ 0 | $ 222

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