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	$ (109,331)	$ (56,914)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	15,054	9,642
Depreciation	2	22
Non-cash lease expense	124	115
Net amortization of premiums and discounts on short-term investments	(6,369)	(2,639)
Amortization of debt issuance costs and discount	269	212
Fair value change in warrant liability	487	110
Write-off of deferred offering costs		337
Unrealized foreign exchange gain and loss	(19)	(20)
Acquired in-process research and development expense	999
Changes in operating assets and liabilities:
Prepaid expenses and other assets	(5,734)	(372)
Accounts payable	7,549	2,245
Accrued expenses and other current liabilities	4,501	352
Operating lease liability	(125)	(111)
Net cash used in operating activities	(92,593)	(47,021)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of short-term and long-term marketable securities	(378,383)	(213,712)
Proceeds from maturities of short-term marketable securities	181,335	103,000
Purchase of in-process research and development	(999)
Net cash used in investing activities	(198,047)	(110,712)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the exercise of stock options	1,772	2,011
Proceeds from the issuance of common stock pursuant to employee stock purchase plan purchases	324	313
Proceeds from the issuance of common in a follow-on public offering	344,839
Proceeds from the issuance of common stock pursuant to the ATM offering	10,604	124,212
Proceeds from the issuance of common stock pursuant to registered direct offering		211,217
Proceeds from loan payable	10,000	15,000
Payment of debt and equity issuance costs	(751)	(745)
Net cash provided by financing activities	366,788	352,008
Net increase in cash, cash equivalents and restricted cash	76,148	194,275
Cash, cash equivalents and restricted cash at the beginning of the period	234,207	249,881
Cash, cash equivalents and restricted cash at the end of the period	310,355	444,156
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for interest	1,861	949
NON-CASH INVESTING AND FINANCING INFORMATION:
Change in net unrealizable loss on marketable securities	$ (531)	$ (288)
Warrant liability costs reclassified to additional paid-in equity on vested warrants issued	431	330
Debt and equity issuance costs included in accounts payable and accrued expenses and other current liabilities	$ 64	$ 206
Deferred offering costs reclassified to additional paid-in equity		$ 364