CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities:
Net loss	$ (101,648)	$ (54,282)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	28,982	11,219
Net accretion on marketable securities	(6,815)	(5,387)
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(1,681)	75
Other assets	(3,076)	(488)
Accounts payable	(1,871)	1,012
Accrued expenses	8,862	1,302
Net cash used in operating activities	(77,247)	(46,549)
Cash flows from investing activities:
Purchases of marketable securities	(371,849)	(269,559)
Proceeds from maturities of marketable securities	181,286	143,893
Net cash used in investing activities	(190,563)	(125,666)
Cash flows from financing activities:
Proceeds from issuance of common stock	10,745	2,281
Payments of insurance costs financed by a third-party	(622)	(910)
Payments of public offering costs	0	(90)
Net cash provided by financing activities	10,123	1,281
Net decrease in cash and cash equivalents	(257,687)	(170,934)
Cash and cash equivalents at beginning of period	335,387	241,806
Cash and cash equivalents at end of period	$ 77,700	$ 70,872