Net Loss Per Share - Schedule of Basic And Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator:
Net loss attributable to common stockholders	$ (16,524)	$ (42,026)	$ (36,191)	$ (35,770)	$ (58,550)	$ (71,961)
Denominator:
Weighted-average shares used to compute net loss per share, basic and diluted	406,886,060		94,985,853		288,190,872	94,285,431
Net loss per share:
Net loss per share, basic and diluted	$ (0.04)		$ (0.38)		$ (0.20)	$ (0.76)
Class A Common Stock [Member]
Numerator:
Net loss attributable to common stockholders	$ (3,782)		$ (7,641)		$ (12,748)	$ (15,210)
Denominator:
Weighted-average shares used to compute net loss per share, basic and diluted	93,126,705		20,055,537		62,748,745	19,928,741
Net loss per share:
Net loss per share, basic and diluted	$ (0.04)		$ (0.38)		$ (0.20)	$ (0.76)
Class B Common Stock [Member]
Numerator:
Net loss attributable to common stockholders	$ (12,742)		$ (28,550)		$ (45,802)	$ (56,751)
Denominator:
Weighted-average shares used to compute net loss per share, basic and diluted	313,759,355		74,930,316		225,442,127	74,356,690
Net loss per share:
Net loss per share, basic and diluted	$ (0.04)		$ (0.38)		$ (0.20)	$ (0.76)