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, 2021	$ 141	$ 1,964,167	$ (32,668)	$ (1,159,903)	$ 771,737
Balance (in shares) at Dec. 31, 2021	141,210
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ 0	0	0	(217,292)	(217,292)
Change in unrealized gains (losses), net of tax	0	0	(29,508)	0	(29,508)
Foreign currency translation	0	0	(964)	0	(964)
Issuance of common stock in connection with employee stock plans	$ 1	6,029	0	0	6,030
Issuance of common stock in connection with employee stock plans (in shares)	1,138
Stock-based compensation expense	$ 0	74,575	0	0	74,575
Payments of tax withholdings related to vesting of employee stock awards and exercise of employee stock options	$ 0	(10,217)	0	0	(10,217)
Payments of tax withholdings related to vesting of employee stock awards and exercise of employee stock options (in shares)	(331)
Balance at Sep. 30, 2022	$ 142	2,034,554	(63,140)	(1,377,195)	594,361
Balance (in shares) at Sep. 30, 2022	142,017
Balance at Jun. 30, 2022	$ 142	2,008,794	(54,007)	(1,330,203)	624,726
Balance (in shares) at Jun. 30, 2022	141,831
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ 0	0	0	(46,992)	(46,992)
Change in unrealized gains (losses), net of tax	0	0	(8,734)	0	(8,734)
Foreign currency translation	0	0	(399)	0	(399)
Issuance of common stock in connection with employee stock plans	$ 0	2,567	0	0	2,567
Issuance of common stock in connection with employee stock plans (in shares)	203
Stock-based compensation expense	$ 0	23,837	0	0	23,837
Payments of tax withholdings related to vesting of employee stock awards and exercise of employee stock options	$ 0	(644)	0	0	(644)
Payments of tax withholdings related to vesting of employee stock awards and exercise of employee stock options (in shares)	(17)
Balance at Sep. 30, 2022	$ 142	2,034,554	(63,140)	(1,377,195)	594,361
Balance (in shares) at Sep. 30, 2022	142,017
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 (losses), 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	$ 1	8,679	0	0	8,680
Issuance of common stock in connection with employee stock plans (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 (losses), 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	$ 0	3,729	0	0	3,729
Issuance of common stock in connection with employee stock plans (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