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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