Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Operating activities:
Net Income (Loss)	$ (74,055)	$ (50,979)	$ (140,985)	$ (96,974)
Reconciliation of net loss to net cash used in operating activities:
Stock-based compensation			32,394	18,271
Depreciation and amortization			1,227	563
Noncash lease expense			1,539	233
Accretion of purchase discounts and amortization of premiums on investment securities, net			(7,255)	(1,441)
Loss on disposal of property and equipment			42	6
Loss on equity method investment	0	0	470	0
Noncash license revenues			0	(2,000)
Increase (decrease) in cash resulting from changes in:
Prepaid expenses and other assets			3,891	(9,485)
Accounts payable and accrued expenses, compensation and related expenses			8,540	6,073
Deferred revenue			74	(1,189)
Operating lease liabilities			1,590	(510)
Net cash used in operating activities			(98,473)	(86,453)
Investing activities:
Purchases of investment securities			(291,729)	(82,165)
Maturities of investment securities			240,684	162,609
Purchases of property and equipment			(2,287)	(253)
Net cash (used in) provided by investing activities			(53,332)	80,191
Financing activities:
Proceeds from issuance of common stock, gross			378,904	11,310
Proceeds from exercise of stock options			20,166	1,832
Net cash provided by financing activities			399,070	13,142
Net change in cash, cash equivalents and restricted cash			247,265	6,880
Cash, cash equivalents and restricted cash at beginning of period			56,197	33,973
Cash, cash equivalents and restricted cash at end of period	303,462	40,853	303,462	40,853
Components of cash, cash equivalents and restricted cash:
Cash and cash equivalents	302,162	39,553	302,162	39,553
Restricted cash	1,300	1,300	1,300	1,300
Cash, cash equivalents and restricted cash at end of period	303,462	40,853	303,462	40,853
Noncash investing and financing activities:
Stock issued under employee stock purchase plan, value	$ 2,027	$ 1,123	2,027	1,123
Stock options exercised receivable			318	0
Amounts accrued for purchases of property and equipment			348	39
Private company shares received under licensing arrangement			$ 0	$ 2,000