CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]	Total
Balance at Dec. 31, 2022	$ 142	$ 2,059,850	$ (57,480)	$ (1,429,625)	$ 572,887
Balance (in shares) at Dec. 31, 2022	142,058
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ 0	0	0	(357,023)	(357,023)
Change in unrealized gains, net of tax	0	0	11,421	0	11,421
Foreign currency translation	0	0	22	0	22
Issuance of common stock in connection with employee stock plans, net	$ 1	8,679	0	0	8,680
Issuance of common stock in connection with employee stock plans, net (in shares)	1,335
Stock-based compensation expense	$ 0	79,473	0	0	79,473
Balance at Sep. 30, 2023	$ 143	2,148,002	(46,037)	(1,786,648)	315,460
Balance (in shares) at Sep. 30, 2023	143,393
Balance at Jun. 30, 2023	$ 143	2,118,309	(50,913)	(1,639,238)	428,301
Balance (in shares) at Jun. 30, 2023	143,167
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ 0	0	0	(147,410)	(147,410)
Change in unrealized gains, net of tax	0	0	5,029	0	5,029
Foreign currency translation	0	0	(153)	0	(153)
Issuance of common stock in connection with employee stock plans, net	$ 0	3,729	0	0	3,729
Issuance of common stock in connection with employee stock plans, net (in shares)	226
Stock-based compensation expense	$ 0	25,964	0	0	25,964
Balance at Sep. 30, 2023	$ 143	2,148,002	(46,037)	(1,786,648)	315,460
Balance (in shares) at Sep. 30, 2023	143,393
Balance at Dec. 31, 2023	$ 144	2,215,098	(32,645)	(1,795,911)	386,686
Balance (in shares) at Dec. 31, 2023	144,341
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ 0	0	0	(349,548)	(349,548)
Change in unrealized gains, net of tax	0	0	8,259	0	8,259
Foreign currency translation	0	0	213	0	213
Issuance of common stock in connection with employee stock plans, net	$ 2	33,205	0	0	33,207
Issuance of common stock in connection with employee stock plans, net (in shares)	1,972
Issuance of public common stock, net	$ 12	489,081	0	0	489,093
Issuance of public common stock, net (in shares)	11,500
Stock-based compensation expense	$ 0	94,558	0	0	94,558
Balance at Sep. 30, 2024	$ 158	2,831,942	(24,173)	(2,145,459)	662,468
Balance (in shares) at Sep. 30, 2024	157,813
Balance at Jun. 30, 2024	$ 146	2,303,369	(34,838)	(2,004,979)	263,698
Balance (in shares) at Jun. 30, 2024	146,025
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ 0	0	0	(140,480)	(140,480)
Change in unrealized gains, net of tax	0	0	10,315	0	10,315
Foreign currency translation	0	0	350	0	350
Issuance of common stock in connection with employee stock plans, net	$ 0	7,002	0	0	7,002
Issuance of common stock in connection with employee stock plans, net (in shares)	288
Issuance of public common stock, net	$ 12	489,081	0	0	489,093
Issuance of public common stock, net (in shares)	11,500
Stock-based compensation expense	$ 0	32,490	0	0	32,490
Balance at Sep. 30, 2024	$ 158	$ 2,831,942	$ (24,173)	$ (2,145,459)	$ 662,468
Balance (in shares) at Sep. 30, 2024	157,813