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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Cash flows from operating activities: |  |
Net loss | $ (53,743) | $ (42,809)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Amortization of debt discount and issuance costs | 87 | 100
Depreciation expense | 499 | 370
Loss on disposal of property and equipment | 0 | 23
Stock-based compensation expense | 1,428 | 1,238
Non-cash lease expense | 544 | 776
Change in fair value of convertible notes | 6,193 | 2,402
Changes in operating assets and liabilities: |  |
Prepaid expenses and other current assets | (94) | (1,209)
Other noncurrent assets | (4,503) | 195
Accounts payable | 2,033 | (1,241)
Operating lease liability | (471) | (409)
Accrued expenses and other current liabilities | 199 | 3,758
Contingent liability | 55,000 | 0
Deferred revenue | (25,849) | 25,849
Net cash used in operating activities | (18,677) | (10,957)
Cash flows from investing activities: |  |
Purchases of property and equipment | (5) | (2,485)
Proceeds from sale of property and equipment | 0 | 19
Net cash used in investing activities | (5) | (2,466)
Cash flows from financing activities: |  |
Proceeds from borrowings under loan and security agreement, net | 5,500 | 0
Payments on borrowings under loan and security agreement, net | (5,200) |
Proceeds from exercise of common stock options | 106 | 69
Proceeds from issuance of convertible debt | 0 | 30,000
Net cash provided by financing activities | 406 | 30,069
Net increase (decrease) in cash, cash equivalents, restricted cash and restricted cash equivalents | (18,276) | 16,646
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of period | 49,540 | 32,894
Cash, cash equivalents, restricted cash and restricted cash equivalents at end of period | 31,264 | 49,540
Supplemental disclosure of non-cash operating, investing and financing activities: |  |
Interest payments on venture debt | 422 | 229
Right-of-use asset obtained in exchange for new operating lease liability | $ 0 | $ 7,666

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