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	(170,744)	(170,744)
Change in unrealized losses, net of tax	0	0	(4,703)	0	(4,703)
Foreign currency translation	0	0	(22)	0	(22)
Issuance of common stock in connection with employee stock plans	$ 1	9,641	0	0	9,642
Issuance of common stock in connection with employee stock plans (in shares)	917
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	67,882	0	0	67,882
Payments of tax withholdings related to vesting of employee stock awards and exercise of employee stock options	$ 0	(15,795)	0	0	(15,795)
Payments of tax withholdings related to vesting of employee stock awards and exercise of employee stock options (in shares)	(261)
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
Balance at Mar. 31, 2021	$ 141	1,925,801	(24,203)	(1,221,175)	680,564
Balance (in shares) at Mar. 31, 2021	140,924
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ 0	0	0	(80,875)	(80,875)
Change in unrealized losses, net of tax	0	0	(1,697)	0	(1,697)
Foreign currency translation	0	0	104	0	104
Issuance of common stock in connection with employee stock plans	$ 0	1,882	0	0	1,882
Issuance of common stock in connection with employee stock plans (in shares)	108
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	30,022	0	0	30,022
Payments of tax withholdings related to vesting of employee stock awards and exercise of employee stock options	$ 0	(458)	0	0	(458)
Payments of tax withholdings related to vesting of employee stock awards and exercise of employee stock options (in shares)	(10)
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
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	(170,300)	(170,300)
Change in unrealized losses, net of tax	0	0	(20,774)	0	(20,774)
Foreign currency translation	0	0	(565)	0	(565)
Issuance of common stock in connection with employee stock plans	$ 1	3,461	0	0	3,462
Issuance of common stock in connection with employee stock plans (in shares)	935
Stock-based compensation expense	$ 0	50,738	0	0	50,738
Payments of tax withholdings related to vesting of employee stock awards and exercise of employee stock options	$ 0	(9,572)	0	0	(9,572)
Payments of tax withholdings related to vesting of employee stock awards and exercise of employee stock options (in shares)	(314)
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
Balance at Mar. 31, 2022	$ 142	1,983,078	(48,578)	(1,225,068)	709,574
Balance (in shares) at Mar. 31, 2022	141,753
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ 0	0	0	(105,135)	(105,135)
Change in unrealized losses, net of tax	0	0	(5,018)	0	(5,018)
Foreign currency translation	0	0	(411)	0	(411)
Issuance of common stock in connection with employee stock plans	$ 0	1,614	0	0	1,614
Issuance of common stock in connection with employee stock plans (in shares)	87
Stock-based compensation expense	$ 0	24,502	0	0	24,502
Payments of tax withholdings related to vesting of employee stock awards and exercise of employee stock options	$ 0	(400)	0	0	(400)
Payments of tax withholdings related to vesting of employee stock awards and exercise of employee stock options (in shares)	(9)
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