Net Loss per Share - Loss per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Net loss used to compute net loss per share, basic and diluted	$ (145,151)	$ (116,026)	$ (283,746)	$ (179,879)
Denominator:
Weighted-average number of shares used in computing net loss per share, basic	96,579	88,077	96,081	87,387
Weighted-average number of shares used in computing net loss per share, diluted	96,579	88,077	96,081	87,387
Net loss per share, basic (in dollars per share)	$ (1.50)	$ (1.32)	$ (2.95)	$ (2.06)
Net loss per share, diluted (in dollars per share)	$ (1.50)	$ (1.32)	$ (2.95)	$ (2.06)
Convertible Notes
Denominator:
Convertible, If-converted value in excess of principal			$ 23,100