Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Operating activities:
Net loss	$ (183,758)	$ (75,544)	$ (353,366)	$ (111,704)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation			63,123	38,511
Losses on extinguishments of debt	0	0	21,155	26,590
Accretion of debt			53,106	3,683
Depreciation and amortization			2,601	3,170
Noncash lease expense			2,230	2,093
Net loss from equity method investments	20,189	7,925	35,745	7,925
Gain on deconsolidation of a subsidiary			0	(126,294)
Gain from investment in equity securities, net			0	(8,136)
Dividend from investment in equity securities			(2,302)	0
Other noncash adjustments, net			(5,464)	(1,911)
Changes in operating assets and liabilities:
Accounts receivable, net			(72,146)	1,091
Inventories			(16,582)	0
Prepaid expenses and other current assets			(22,745)	(6,506)
Other assets			(174)	942
Accounts payable			16,516	8,858
Accrued compensation and benefits			(15,637)	(8,378)
Accrued research and development liabilities			(2,977)	7,067
Operating lease liabilities			(3,117)	(2,981)
Deferred revenue			(6,491)	22,236
Other current liabilities			26,609	(1,090)
Net cash used in operating activities			(279,916)	(144,834)
Investing activities:
Purchases of marketable securities			(7,908)	(93,811)
Maturities of marketable securities			0	55,000
Purchases of investments in equity securities			0	(20,271)
Proceeds from sales of investments in equity securities			0	63,229
Proceeds from special cash dividends received from investment in equity securities			0	25,682
Payment for intangible assets			(6,095)	(3,190)
Purchases of property and equipment			(594)	(749)
Decrease in cash and cash equivalents resulting from deconsolidation of subsidiaries			0	(98)
Net cash provided by (used in) investing activities			(14,597)	25,792
Financing activities:
Repurchases of common stock			(48,276)	0
Proceeds from royalty obligation under Royalty Purchase Agreement (as described in Note 10)			300,000	0
Issuance costs associated with royalty obligation under Royalty Purchase Agreement			(2,012)	0
Repayment of term loans			(459,000)	(473,417)
Repayment of deferred royalty obligation			(2,005)	0
Proceeds from issuance of common stock through public offerings, net			0	314,759
Proceeds from common stock issuances under ESPP			3,237	2,364
Proceeds from stock option exercises, net of repurchases			9,680	778
Transactions with noncontrolling interests			1,550	0
Repurchase of RSU shares to satisfy tax withholding			(3,771)	(4,679)
Net cash provided by financing activities			362,369	273,819
Net increase in cash, cash equivalents and restricted cash			67,856	154,777
Cash, cash equivalents and restricted cash at beginning of period			683,244	394,732	$ 394,732
Cash, cash equivalents and restricted cash at end of period	751,100	549,509	751,100	549,509	683,244
Supplemental Disclosure of Cash Flow Information:
Cash paid for interest			23,271	49,046
Cash paid for income taxes			1,153	0
Supplemental Disclosures of Noncash Investing and Financing Information:
Recognized intangible asset recorded to "Other current liabilities"			2,400	0
Unpaid public offering issuance costs			0	18
Deferred and unpaid issuance costs recorded to "Other current liabilities"			998	74
Unpaid property and equipment			0	70
Transfers to noncontrolling interests			(1,640)	(1,929)
Reconciliation of Cash, Cash Equivalents and Restricted Cash:
Cash and cash equivalents	748,953	407,958	748,953	407,958	681,101
Restricted cash - Included in "Prepaid expenses and other current assets"	$ 449	$ 139,409	$ 449	$ 139,409	$ 126
Restricted Cash, Current, Statement of Financial Position [Extensible Enumeration]	Prepaid Expense and Other Assets, Current	Prepaid Expense and Other Assets, Current	Prepaid Expense and Other Assets, Current	Prepaid Expense and Other Assets, Current	Prepaid Expense and Other Assets, Current
Restricted cash - Included in "Other assets"	$ 1,698	$ 2,142	$ 1,698	$ 2,142	$ 2,017
Restricted Cash, Noncurrent, Asset, Statement of Financial Position [Extensible List]	Other assets	Other assets	Other assets	Other assets	Other assets
Total cash, cash equivalents and restricted cash	$ 751,100	$ 549,509	$ 751,100	$ 549,509	$ 683,244
2031 Notes
Financing activities:
Proceeds from issuance of 2031 Notes			575,000	0
Issuance costs and discounts associated with term loan under Amended Financing Agreement			(12,034)	0
Financing Agreement
Financing activities:
Proceeds from term loan under Amended Financing Agreement (as described in Note 9)			0	450,000
Issuance costs and discounts associated with term loan under Amended Financing Agreement			$ 0	$ (15,986)