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, 2020	$ 140	$ 1,895,519	$ (21,071)	$ (1,131,306)	$ 743,282
Balance (in shares) at Dec. 31, 2020	140,366
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ 0	0	0	(253,210)	(253,210)
Change in unrealized losses, net of tax	0	0	(6,321)	0	(6,321)
Foreign currency translation	0	0	(45)	0	(45)
Issuance of common stock in connection with employee stock plans	$ 1	11,563	0	0	11,564
Issuance of common stock in connection with employee stock plans (in shares)	1,094
Issuance of warrants	$ 0	89,752	0	0	89,752
Purchase of note hedges	0	(136,620)	0	0	(136,620)
Stock-based compensation expense	0	98,419	0	0	98,419
Payments of tax withholdings related to vesting of employee stock awards and exercise of employee stock options	$ 0	(16,285)	0	0	(16,285)
Payments of tax withholdings related to vesting of employee stock awards and exercise of employee stock options (in shares)	(276)
Balance at Sep. 30, 2021	$ 141	1,942,348	(27,437)	(1,384,516)	530,536
Balance (in shares) at Sep. 30, 2021	141,184
Balance at Jun. 30, 2021	$ 141	1,910,379	(25,796)	(1,302,050)	582,674
Balance (in shares) at Jun. 30, 2021	141,022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ 0	0	0	(82,466)	(82,466)
Change in unrealized losses, net of tax	0	0	(1,618)	0	(1,618)
Foreign currency translation	0	0	(23)	0	(23)
Issuance of common stock in connection with employee stock plans	$ 0	1,922	0	0	1,922
Issuance of common stock in connection with employee stock plans (in shares)	176
Issuance of warrants	$ 0	0	0	0	0
Purchase of note hedges	0	0	0	0	0
Stock-based compensation expense	0	30,537	0	0	30,537
Payments of tax withholdings related to vesting of employee stock awards and exercise of employee stock options	$ 0	(490)	0	0	(490)
Payments of tax withholdings related to vesting of employee stock awards and exercise of employee stock options (in shares)	(14)
Balance at Sep. 30, 2021	$ 141	1,942,348	(27,437)	(1,384,516)	530,536
Balance (in shares) at Sep. 30, 2021	141,184
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 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 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