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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Cash flows from operating activities |  |  |  |  |
Net loss |  |  | $ (20,376) | $ (31,491) |
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |  |  |
Depreciation and amortization |  |  | 123 | 273 |
Accretion related to marketable securities |  |  | (767) | 12 |
Stock-based compensation |  |  | 1,575 | 2,072 |
Loss from equity method investment | $ 865 | $ 2,730 | 3,880 | 5,367 |
Changes in operating assets and liabilities: |  |  |  |  |
Accounts receivable - related party |  |  | 577 | 4 |
Prepaid and other current assets |  |  | (142) | 202 |
Operating lease right-of-use asset |  |  | 794 | 723 |
Other assets |  |  | 40 | (12) |
Accounts payable |  |  | (572) | 2,662 |
Accrued and other liabilities |  |  | (2,989) | 1,489 |
Operating lease liability |  |  | (911) | (777) |
Net cash used in operating activities |  |  | (18,768) | (19,476) |
Cash flows from investing activities |  |  |  |  |
Purchases of marketable securities |  |  | (35,623) | (46,890) |
Maturities of marketable securities |  |  | 53,516 | 27,765 |
Purchases of property and equipment |  |  | (34) | (269) |
Net cash provided by (used in) investing activities |  |  | 17,859 | (19,394) |
Cash flows from financing activities |  |  |  |  |
Proceeds from issuance of common stock in connection with at-the-market offering, net |  |  | 7,843 |  |
Proceeds from exercise of common stock options |  |  | 12 |  |
Net cash provided by financing activities |  |  | 7,855 |  |
Net increase (decrease) in cash and cash equivalents |  |  | 6,946 | (38,870) |
Cash and cash equivalents at beginning of the period |  |  | 13,159 | 63,458 | $ 63,458
Cash and cash equivalents at end of the period | $ 20,105 | $ 24,588 | $ 20,105 | $ 24,588 | $ 13,159

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