Net Loss per Share - Loss per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Numerator:
Net loss used to compute net loss per share, basic and diluted	$ (138,595)	$ (63,853)
Denominator:
Weighted-average number of shares used in computing net loss per share, basic	95,578	86,689
Weighted-average number of shares used in computing net loss per share, diluted	95,578	86,689
Net loss per share, basic (in dollars per share)	$ (1.45)	$ (0.74)
Net loss per share, diluted (in dollars per share)	$ (1.45)	$ (0.74)
Convertible Notes
Denominator:
Convertible, If-converted value in excess of principal	$ 114,400