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CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Operating activities |  |
Net loss | $ (42,972) | $ (43,894)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization expense | 1,004 | 639
Non-cash lease expense | 1,953 | 1,821
Stock-based compensation | 18,385 | 6,111
Non-cash interest expense | 3,411 | 2,090
Non-cash royalty revenue related to the sale of future royalties | (967) | 0
Other, net | (2,483) | (521)
Changes in operating assets and liabilities: |  |
Accounts receivable | (15,210) | (1,376)
Inventory | (33,945) | (19,566)
Prepaid commercial manufacturing | 8,363 | 401
Prepaid expenses and other assets | (4,626) | 817
Accounts payable | (257) | (5,565)
Accrued compensation and benefits | (2,139) | (668)
Operating lease liabilities | (2,200) | (1,892)
Accrued and other liabilities | 11,947 | 110
Deferred revenue | 4,616 | 1,961
Net cash used in operating activities | (55,120) | (59,532)
Investing activities |  |
Proceeds from maturities and redemptions of investments | 78,112 | 19,250
Purchases of investments | (56,870) | (88,127)
Purchases of property and equipment | (281) | (107)
Net cash provided by (used in) investing activities | 20,961 | (68,984)
Financing activities |  |
Proceeds from 2022 Loan Agreement, net of issuance costs | 49,750 | 0
Proceeds from issuance of common stock in at the market offering, net of issuance costs | 0 | 62,085
Proceeds from issuance of common stock under equity incentive and stock purchase plans | 4,829 | 349
Net cash provided by financing activities | 54,579 | 62,434
Net increase (decrease) in cash and cash equivalents | 20,420 | (66,082)
Cash and cash equivalents at beginning of period | 21,470 | 96,140
Cash and cash equivalents at end of period | 41,890 | 30,058
Supplementary disclosure of cash flow information: |  |
Cash paid for interest | 4,034 | 1,757
Cash paid for income taxes | 272 | 19
Supplementary disclosure of non-cash activities: |  |
Right-of-use assets obtained in exchange for lease obligations | 689 | 0
Issuance of common stock for services | $ 257 | $ 337

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