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Condensed Statements of Cash Flows (unaudited) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Cash flows from operating activities |  |
Net loss | $ (62,091) | $ (50,231)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization | 26 | 11
Accretion of discount on purchase of debt securities, net | (4,475) | (1,641)
Accretion of loan exit fee and amortization of loan costs | 386 | 153
Reduction in the carrying amount of operating lease right-of-use assets | 1,020 | 1,143
Stock-based compensation | 8,997 | 5,349
Changes in operating assets and liabilities: |  |
Prepaid expense and other current assets | 2,328 | 1,451
Other assets | 22 | (274)
Accounts payable | (6,454) | 1,289
Accrued and other current liabilities | 2,889 | 31
Operating lease liabilities | (1,260) | (1,345)
Net cash used in operating activities | (58,612) | (44,064)
Cash flows from investing activities |  |
Purchase of property and equipment | (89) | 0
Purchase of marketable securities | (336,055) | (143,058)
Proceeds from maturities of marketable securities | 90,181 | 59,300
Proceeds from sale of marketable securities | 4,000 | 9,543
Net cash used in investing activities | (241,963) | (74,215)
Cash flows from financing activities |  |
Proceeds from exercise of stock options and employee stock purchase plan | 10,350 | 672
Proceeds from short swing settlement | 37 | 0
Proceeds from issuance of Class A common stock in follow-on offering | 287,500 | 115,000
Payment of costs and underwriting discounts and commissions related to follow-on offering | (17,908) | (7,256)
Net cash provided by financing activities | 279,979 | 108,416
Net decrease in cash and cash equivalents | (20,596) | (9,863)
Cash and cash equivalents, beginning of period | 45,681 | 43,752
Supplemental disclosure of cash flow information |  |
Cash paid for interest expense | 3,254 | 1,636
Cash paid for operating leases | 1,528 | 1,492
Receivable on exercise of stock options. | 0 | 5
Cash and cash equivalents [Member] |  |
Cash flows from financing activities |  |
Cash and cash equivalents, end of period | $ 25,085 | $ 33,889

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