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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Cash flows used in operating activities:        
Net loss $ (11,216) $ (44,907) $ (17,711) $ (68,538)
Adjustments to reconcile net loss to net cash used in operating activities:        
Gain on lease termination       (10)
Non-cash lease expense     153 192
Accretion on investment discounts     (1,124) (951)
Stock-based compensation 2,694 3,063 5,558 4,757
Change in fair value of warrant liabilities (12,293) 31,274 (22,353) 44,610
Changes in operating assets and liabilities:        
Prepaid expenses and other assets     (265) 1,347
Accounts payable, accrued expenses and other liabilities     2,120 2,244
Operating lease liabilities     (151) (166)
Net cash used in operating activities     (33,773) (16,515)
Cash flows from investing activities:        
Purchase of available-for-sale short-term investments     (59,254) (49,230)
Proceeds from maturities of available-for-sale short-term investments     78,104 39,100
Net cash provided by (used in) investing activities     18,850 (10,130)
Cash flows from financing activities:        
Proceeds from exercise of stock options     115  
Proceeds from issuances of common stock and pre-funded warrants, net       48,072
Net cash provided by financing activities     115 48,072
Net change in cash and cash equivalents     (14,808) 21,427
Cash and cash equivalents at beginning of period     20,549 4,612
Cash and cash equivalents at end of period $ 5,741 $ 26,039 5,741 26,039
Noncash activities:        
Increase in operating lease asset and liability due to new lease       $ 448
Unrealized loss on available-for-sale securities, net     $ (74)