CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 335,387	$ 241,806
Marketable securities	384,518	230,357
Prepaid expenses and other current assets	6,583	5,828
Total current assets	726,488	477,991
Other assets	5,896	4,468
Total assets	732,384	482,459
Current liabilities:
Accounts payable	9,274	7,195
Accrued expenses	22,549	12,286
Total current liabilities	31,823	19,481
Total liabilities	31,823	19,481
Commitments and contingencies (Note 9)
Stockholders' equity:
Preferred stock, $0.0001 par value; 10,000,000 shares authorized; no shares issued or outstanding	0	0
Additional paid-in capital	986,819	623,543
Accumulated other comprehensive loss	31	(494)
Accumulated deficit	(286,296)	(160,077)
Total stockholders' equity	700,561	462,978
Total liabilities and stockholders' equity	732,384	482,459
Common Class A [Member]
Stockholders' equity:
Common stock	6	5
Common Class B [Member]
Stockholders' equity:
Common stock	$ 1	$ 1