Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (390,123)	$ (349,031)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	7,719	6,510
(Gain) loss on disposal of property and equipment	(76)	5
Stock-based compensation	114,656	99,007
Accretion of investment discounts and premiums	(14,215)	(19,590)
(Recognition) deferral of equity method investment intra-entity profit on sales	(20,967)	6,624
Change in fair value of investments	29,483	0
Loss from equity method investment	0	10,905
Change in fair value of contingent consideration	0	100
Changes in operating assets and liabilities:
Accounts receivable	27,602	(2,723)
Prepaid expenses and other current assets	4,643	(11,806)
Operating lease right-of-use assets	15,044	14,148
Other assets	1,476	(836)
Accounts payable	5,364	(1,419)
Accrued expenses	(14,336)	(3,008)
Deferred revenue	(16,231)	(37,705)
Operating lease liabilities	(13,724)	(12,213)
Net cash used in operating activities	(263,685)	(301,032)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(4,797)	(12,465)
Purchases of marketable securities	(766,471)	(754,689)
Sales and maturities of marketable securities	745,270	689,868
Net cash used in investing activities	(25,998)	(77,286)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from options exercised	4,832	5,604
Issuance of shares through employee stock purchase plan	1,669	2,051
Net cash provided by financing activities	183,430	23,839
Net decrease in cash, cash equivalents and restricted cash equivalents	(106,253)	(354,479)
Cash, cash equivalents and restricted cash equivalents, beginning of period	240,353	535,463
Cash, cash equivalents and restricted cash equivalents, end of period	134,100	180,984
Reconciliation of cash, cash equivalents and restricted cash equivalents to condensed consolidated balance sheet:
Cash and cash equivalents	120,495	168,027
Restricted cash equivalents, included in investments and other assets	13,605	12,957
Total cash, cash equivalents and restricted cash equivalents	134,100	180,984
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Purchases of property and equipment unpaid at period end	374	1,552
Proceeds from option exercises unpaid at period end	1,002	0
Non-cash trade-in of property and equipment	99	0
Shares issued for Rewrite contingent consideration	0	24,126
At The Market Offerings [Member]
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from issuance of common stock through at-the-market offerings	$ 176,929	$ 16,184