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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Cash flows from operating activities: |  |
Net income | $ 64,495 | $ 2,859
Adjustments to reconcile net income to net cash (used in) provided by operating activities: |  |
Depreciation expense | 2,781 | 2,105
Stock‑based compensation expense | 13,215 | 9,270
Amortization/(accretion) of marketable securities | (7,511) | (3,780)
Changes in operating assets and liabilities: |  |
Collaboration receivable | 3,275 | (5,025)
Prepaid expenses and other current assets | (1,464) | (3,894)
Right-of-use assets, operating leases | 7,717 | 11,146
Other non-current assets | 2,044 | (11,754)
Accounts payable | (1,855) | (5,211)
Accrued expenses and other current liabilities | 2,133 | 1,857
Income tax payable | (1,773) | 0
Operating lease liabilities | (6,916) | (12,703)
Deferred revenue | (86,093) | 158,946
Net cash (used in) provided by operating activities | (9,952) | 143,816
Cash flows from investing activities: |  |
Purchases of property and equipment | (2,523) | (4,638)
Purchases of marketable securities | (373,220) | (318,686)
Maturities of marketable securities | 294,580 | 165,886
Net cash (used in) investing activities | (81,163) | (157,438)
Cash flows from financing activities: |  |
Proceeds from exercise of stock options | 1,691 | 754
Proceeds from issuance of common stock under the employee stock purchase plan | 263 | 186
Net cash provided by financing activities | 101,562 | 20,347
Net increase in cash, cash equivalents, and restricted cash | 10,447 | 6,725
Cash, cash equivalents, and restricted cash at beginning of period | 71,552 | 49,107
Cash, cash equivalents, and restricted cash at end of period | 81,999 | 55,832
Supplemental cash flow disclosures: |  |
Purchases of property and equipment included in accounts payable and accrued expenses | 60 | 299
Right-of-use assets obtained in exchange from operating lease liabilities | 0 | 77,584
Right-of-use assets surrendered as part of lease modification | 0 | 7,761
Transfer of deposits for equipment from operating to investing cash flows | 0 | 617
Vesting of options early exercised subject to repurchase | 38 | 72
Registered Direct Offering |  |
Cash flows from financing activities: |  |
Proceeds from issuance of common stock | 99,608 | 0
Vertex Agreement |  |
Cash flows from financing activities: |  |
Proceeds from issuance of common stock | $ 0 | $ 19,407

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