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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Cash flows from operating activities:        
Net income (loss) $ 6,155,000 $ (26,376,000) $ 31,198,000 $ (50,647,000)
Adjustments to reconcile net loss to net cash used in operating activities:        
Stock-based compensation     4,939,000 1,508,000
Gain from change in fair value of warrant liabilities (65,142,000) (0) (108,183,000) (0)
Depreciation 244,000 272,000 496,000 544,000
Amortization of intangible assets 56,000 119,000 117,000 238,000
Changes in operating assets and liabilities:        
Prepaid and other current assets     (6,334,000) 4,116,000
Operating lease right-of-use assets and liabilities     0 (17,000)
Accounts payable and accrued expenses     41,979,000 6,661,000
Accrued development expense     (1,441,000) 4,764,000
Accrued compensation and benefits     18,000 50,000
Other liabilities     (157,000) (396,000)
Net cash used in operating activities     (37,368,000) (33,179,000)
Cash flows from investing activities:        
Purchases of property and equipment     (29,000) (351,000)
Net cash used in investing activities     (29,000) (351,000)
Cash flows from financing activities:        
Proceeds from exercise of common stock warrants, net of exercise costs     123,552,000 0
Proceeds from issuance of common stock upon exercise of stock options   889,000 0 953,000
Net cash provided by financing activities     123,552,000 953,000
Net increase (decrease) in cash and cash equivalents     86,155,000 (32,577,000)
Cash and cash equivalents at beginning of period     121,136,000 201,015,000
Cash and cash equivalents at end of period $ 207,291,000 $ 168,438,000 207,291,000 168,438,000
Non-cash financing activities        
Issuance of warrants resulting in recognition of warrant liabilities     113,363,000 0
Derecognition of warrant liabilities upon exercise of warrants     $ (5,180,000) $ 0