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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Cash flows used in operating activities:        
Net income (loss) $ 76,971 $ (9,906) $ 8,433 $ (86,438)
Adjustments to reconcile net income (loss) to net cash used in operating activities:        
Gain on lease termination     (10)  
Amortization of operating lease asset     271 280
Accretion on investment discounts     (1,916) (579)
Stock-based compensation 1,783 1,734 6,540 4,835
Change in fair value of warrant liabilities and fair value of financial instruments issued in excess of proceeds (96,439) (443) (51,829) 55,738
Changes in operating assets and liabilities:        
Prepaid expenses and other assets     1,685 (356)
Accounts payable, accrued expenses and other liabilities     8,791 (3,609)
Operating lease liabilities     (249) (267)
Net cash used in operating activities     (28,284) (30,396)
Cash flows from investing activities:        
Purchase of available-for-sale short-term investments     (83,350) (60,363)
Proceeds from maturities of available-for-sale short-term investments     60,418 5,000
Net cash used in investing activities     (22,932) (55,363)
Cash flows from financing activities:        
Proceeds from issuances of common stock and pre-funded warrants, net     53,355 33,017
Net cash provided by financing activities     53,355 33,017
Net change in cash and cash equivalents     2,139 (52,742)
Cash and cash equivalents at beginning of period     4,612 56,409
Cash and cash equivalents at end of period $ 6,751 $ 3,667 6,751 3,667
Noncash activities:        
Common stock exchanged for X and X1 non-voting convertible preferred stock       $ 1
Unrealized gain on available-for-sale securities     102  
Increase in operating lease asset and liability due to new lease     377  
Settlement of warrant liability into common stock due to exercise     $ 420