CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 115,077	$ 34,814
Marketable securities	708,769	388,784
Accounts and other receivables	2,671	2,628
Prepaid and other current assets	8,807	5,467
Total current assets	835,324	431,693
Property and equipment, net	4,061	4,060
Operating lease right-of-use assets, net	2,165	2,577
Intangible assets	27,190	27,190
Other assets	107	107
Total assets	868,847	465,627
Current liabilities:
Accounts payable	3,234	3,494
Accrued expenses	17,536	22,029
Current portion of operating lease liabilities	1,644	1,614
Current portion of other long-term liabilities	3,877	3,988
Total current liabilities	26,291	31,125
Long-term portion of operating lease liabilities	470	928
Other long-term liabilities	3,473	4,403
Total liabilities	30,234	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 March 31, 2024 and December 31, 2023
Common stock, $.001 par value; 297,000,000 shares authorized; 65,910,548 and 55,883,377 shares issued and outstanding at March 31, 2024 and December 31, 2023, respectively	66	56
Additional paid-in capital	2,266,472	1,823,168
Accumulated other comprehensive income	2,244	3,308
Accumulated deficit	(1,430,169)	(1,397,361)
Total stockholders' equity	838,613	429,171
Total liabilities and stockholders' equity	$ 868,847	$ 465,627