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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Current assets:    
Cash and cash equivalents $ 42,739 $ 34,814
Marketable securities 759,578 388,784
Accounts and other receivables 1,534 2,628
Prepaid and other current assets 8,124 5,467
Total current assets 811,975 431,693
Property and equipment, net 3,864 4,060
Operating lease right-of-use assets, net 2,450 2,577
Intangible assets 27,190 27,190
Other assets 107 107
Total assets 845,586 465,627
Current liabilities:    
Accounts payable 3,802 3,494
Accrued expenses 18,594 22,029
Current portion of operating lease liabilities 1,589 1,614
Current portion of other long-term liabilities 3,673 3,988
Total current liabilities 27,658 31,125
Long-term portion of operating lease liabilities 796 928
Other long-term liabilities 3,473 4,403
Total liabilities 31,927 36,456
Commitments and contingent liabilities
Stockholders' equity:    
Convertible preferred stock, $.01 par value; 3,000,000 shares authorized; no shares issued and outstanding at June 30, 2024 and December 31, 2023
Common stock, $.001 par value; 297,000,000 shares authorized; 66,280,667 and 55,883,377 shares issued and outstanding at June 30, 2024 and December 31, 2023, respectively 66 56
Additional paid-in capital 2,277,824 1,823,168
Accumulated other comprehensive income 1,780 3,308
Accumulated deficit (1,466,011) (1,397,361)
Total stockholders' equity 813,659 429,171
Total liabilities and stockholders' equity $ 845,586 $ 465,627