Net Loss Per Share - Schedule of Basic And Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2021	Dec. 31, 2020
Numerator:
Net loss	$ (89,396)	$ (16,524)	$ (42,026)	$ (44,645)	$ (36,191)	$ (35,770)	$ (147,946)	$ (116,606)
Denominator:
Weighted-average shares used to compute net loss per share, basic and diluted	426,591,111			96,974,875			334,491,905	95,185,171
Net loss per share:
Net loss per share, basic and diluted	$ (0.21)			$ (0.46)			$ (0.44)	$ (1.23)
Class A Common Stock [Member]
Numerator:
Net loss	$ (25,829)			$ (9,315)			$ (36,672)	$ (24,537)
Denominator:
Weighted-average shares used to compute net loss per share, basic and diluted	123,255,556			20,232,652			82,912,004	20,030,414
Net loss per share:
Net loss per share, basic and diluted	$ (0.21)			$ (0.46)			$ (0.44)	$ (1.23)
Class B Common Stock [Member]
Numerator:
Net loss	$ (63,567)			$ (35,330)			$ (111,274)	$ (92,069)
Denominator:
Weighted-average shares used to compute net loss per share, basic and diluted	303,335,555			76,742,223			251,579,901	75,154,757
Net loss per share:
Net loss per share, basic and diluted	$ (0.21)			$ (0.46)			$ (0.44)	$ (1.23)