Net Loss per Share - Loss per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Numerator:
Net loss used to compute net loss per share, basic and diluted	$ (547,799)	$ (471,716)	$ (229,743)
Denominator:
Weighted-average number of shares used in computing net loss per share, basic	98,408	90,558	81,011
Weighted-average number of shares used in computing net loss per share, diluted	98,408	90,558	81,011
Net loss per share, basic (in dollars per share)	$ (5.57)	$ (5.21)	$ (2.84)
Net loss per share, diluted (in dollars per share)	$ (5.57)	$ (5.21)	$ (2.84)
Convertible Notes
Denominator:
Convertible, If-converted value in excess of principal	$ 5,100