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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Cash flows from operating activities |  |
Net income (loss) | $ (107,854) | $ 19,460
Adjustments to reconcile net income (loss) to net cash used in operating activities: |  |
Depreciation and amortization expense | 3,652 | 5,795
Amortization of premiums and discounts on marketable securities | (2,254) | (1,404)
Stock-based compensation | 12,204 | 9,224
Gain on modification of debt | 0 | (100,930)
Non-cash interest expense recognized | 0 | 1,430
Operating Lease, Noncash Expense | 1,228 | 1,834
Other non-cash items | 21 | 339
Changes in operating assets and liabilities: |  |
Accounts receivable | 4,176 | 49,812
Inventory | 106 | 8
Prepaid expenses and other current assets | 673 | 3,686
Other non current assets | 200 | (7)
Accounts payable | (1,243) | (1,104)
Accrued expenses and other current liabilities | 450 | (1,293)
Lease liabilities | 86 | (513)
Deferred revenue | (1,573) | (1,259)
Net cash used in operating activities | (90,128) | (14,922)
Cash flows from investing activities |  |
Purchases of marketable securities | (58,505) | (148,040)
Proceeds from sale and maturities of marketable securities | 133,150 | 63,250
Purchases of property, equipment and software | (2,494) | (645)
Proceeds from Sale of Machinery and Equipment | 80 | 54
Net cash provided by (used in) investing activities | 72,231 | (85,381)
Cash flows from financing activities |  |
Proceeds from issuance of common stock, net of offering costs | 0 | 616
Proceeds from stock option exercises and ESPP purchases | 3,270 | 227
Taxes paid related to net share settlement of equity awards | (2,397) | (165)
Principal payments on royalty monetization arrangement | 0 | (156)
Net proceeds from sale of future royalties | 0 | 99,655
Net cash provided by financing activities | 873 | 100,177
Net change in cash and cash equivalents | (17,024) | (126)
Cash and cash equivalents at beginning of period | 100,956 | 108,884
Cash and cash equivalents at end of period | 83,932 | 108,758
Supplemental Cash Flow Information |  |
Property, equipment and software included in accounts payable or accruals | $ 36 | $ 177

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