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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOW (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash flows from operating activities:    
Net loss $ (68,650) $ (59,863)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 1,572 1,482
Amortization and premium of marketable securities, net (8,053) (2,416)
Loss on sale or disposal of assets 8  
Stock-based compensation expense 14,842 9,557
Changes in operating assets and liabilities:    
Accounts and other receivables 1,094 229
Prepaid and other current assets (5,610) (61)
Other assets   (3)
Accounts payable and accrued expenses (3,067) (2,970)
Other liabilities (2,101) (1,720)
Net cash used in operating activities (69,965) (55,765)
Cash flows from investing activities:    
Sales and maturities of marketable securities 199,370 210,150
Purchases of marketable securities (560,686) (155,422)
Acquisition of property and equipment (618) (995)
Net cash (used in) provided by investing activities (361,934) 53,733
Cash flows from financing activities:    
Net proceeds from stock issuances 432,298  
Proceeds from issuance of stock from employee benefit plans 7,526 827
Net cash provided by financing activities 439,824 827
Net increase (decrease) in cash and cash equivalents 7,925 (1,205)
Cash and cash equivalents at beginning of period 34,814 29,429
Cash and cash equivalents at end of period 42,739 28,224
Non-cash investing activities    
Accrued construction in progress $ 17 $ 46