Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities:
Net Income (Loss)	$ (95,496)	$ (188,917)	$ (142,181)
Adjustments to reconcile net loss to net cash used in operating activities:
Acquired in-process research and development assets	55,000	3,000	0
Share-based compensation expense	48,263	39,341	27,242
Depreciation expense	92	36	63
Accretion of discounts on short-term investments, net	(6,389)	(10,078)	(2,030)
Amortization of intangible assets	1,470	0	0
Amortization of operating right-of-use asset	467	347	468
Gain from sale of priority review voucher	(108,000)	0	0
Changes in operating assets and liabilities:
Accounts receivable, net	(13,876)	0	0
Inventory	(3,243)	0	0
Prepaid expenses and other current assets	(4,556)	(3,322)	(546)
Deposits and other long-term assets	93	255	(300)
Accounts payable	686	2,316	(1,484)
Accrued expenses and other current liabilities	42,101	10,574	9,241
Deferred revenue	4,787	0	0
Operating lease liability	(273)	(405)	(347)
Other long-term liability	761	0	0
Net cash used in operating activities	(78,113)	(146,853)	(109,874)
Cash flows from investing activities:
Cash paid for purchase of short-term investments	(658,616)	(443,838)	(394,206)
Proceeds from maturity of short-term investment	314,482	575,440	139,158
Proceeds from sale of short-term investments	79,409	0	0
Cash paid for acquired intangible assets	(17,100)	0	0
Proceeds from sale of priority review voucher	108,000	0	0
Cash paid for acquired in-process research and development assets	(55,000)	(3,000)	0
Cash paid for purchase of property and equipment	(2,169)	(224)	(26)
Net cash (used in) provided by investing activities	(230,994)	128,378	(255,074)
Cash flows from financing activities:
Proceeds from issuance of common stock in connection with private placement, net of placement agent fees and offering costs	178,177	0	0
Proceeds from issuance of prefunded warrants to purchase common stock in connection with private placement, net of issuance costs	20,941	0	0
Proceeds from issuance of common stock, net	0	161,409	161,610
Proceeds from issuance of common stock upon stock option exercises	2,267	1,338	3,649
Proceeds from issuance of common stock upon Employee Stock Purchase Plan purchase	1,906	1,250	642
Cash provided by financing activities	203,291	163,997	165,901
Net (decrease) increase in cash and cash equivalents	(105,816)	145,522	(199,047)
Cash and cash equivalents, beginning of period	230,784	85,262	284,309
Cash and cash equivalents, end of period	124,968	230,784	85,262
Supplemental disclosure of cash flow information:
Income taxes paid	1,898	0	0
Supplemental disclosures of noncash activities:
Cash not yet paid for license agreement milestone payment	20,000
Right-of-use asset obtained in exchange for new operating lease liabilities	$ 2,554	$ 0	$ 940