Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating activities:
Net Income (Loss)	$ (66,930)	$ (45,995)
Reconciliation of net loss to net cash used in operating activities:
Stock-based compensation	13,454	8,096
Depreciation and amortization	474	283
Noncash lease expense	789	115
Accretion of purchase discounts and amortization of premiums on investment securities, net	(3,847)	(530)
Loss on disposal of property and equipment	42	0
Loss on equity method investment	470	0
Noncash license revenues	0	(2,000)
Increase (decrease) in cash resulting from changes in:
Prepaid expenses and other assets	212	1,516
Accounts payable and accrued expenses, compensation and related expenses	1,306	(1,345)
Deferred revenue	398	(605)
Operating lease liabilities	776	(253)
Net cash used in operating activities	(52,856)	(40,718)
Investing activities:
Purchases of investment securities	(99,741)	(22,671)
Maturities of investment securities	101,382	71,442
Purchases of property and equipment	(1,332)	(16)
Net cash used in investing activities	309	48,755
Financing activities:
Proceeds from issuance of common stock, gross	383,215	0
Proceeds from exercise of stock options	10,359	484
Net cash provided by financing activities	393,574	484
Net change in cash, cash equivalents and restricted cash	341,027	8,521
Cash, cash equivalents and restricted cash at beginning of period	56,197	33,973
Cash, cash equivalents and restricted cash at end of period	397,224	42,494
Components of cash, cash equivalents and restricted cash:
Cash and cash equivalents	395,924	41,193
Restricted cash	1,300	1,301
Cash, cash equivalents and restricted cash at end of period	397,224	42,494
Noncash investing and financing activities:
Accrued financing costs	4,325	0
Stock options exercised receivable	881	0
Amounts accrued for purchases of property and equipment	168	33
Private company shares received under licensing arrangement	$ 0	$ 2,000