Net Loss Per Share - Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Earnings Per Share [Abstract]
Net loss, basic	$ (107,754)	$ (86,102)	$ (325,367)	$ (292,406)
Net loss, diluted	$ (107,754)	$ (86,102)	$ (325,367)	$ (292,406)
Net loss per share, basic (in usd per share)	$ (0.88)	$ (0.73)	$ (2.66)	$ (2.66)
Net loss per share, diluted (in usd per share)	$ (0.88)	$ (0.73)	$ (2.66)	$ (2.66)
Weighted-average shares used in computing net loss per share, basic (in shares)	123,051	117,736	122,406	109,791
Weighted-average shares used in computing net loss per share, diluted (in shares)	123,051	117,736	122,406	109,791