Net Loss per Share Attributable to Common Stockholders - Common Stock Equivalents Excluded from Calculation of Diluted Net Loss Per Share (Details) - $ / shares	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share Basic [Line Items]
Net loss per share, basic and diluted	$ (0.25)	$ (0.38)
Class A Common Stock [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	93,866,045	0
Net loss per share, basic and diluted	$ (0.25)	$ (0.38)
Class A Common Stock [Member] | Stock Option Activity [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	65,962,668	0
Class A Common Stock [Member] | Redeemable Convertible Preferred Stock [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	0	0
Class A Common Stock [Member] | Issuance of Common Stock Upon Early Exercise of Options Unvested [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	0	0
Class A Common Stock [Member] | Restricted Stock Units [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	2,837,769	0
Class A Common Stock [Member] | Warrant [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	25,065,608	0
Class B Common Stock [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	0	273,468,679
Net loss per share, basic and diluted	$ (0.25)	$ (0.38)
Class B Common Stock [Member] | Stock Option Activity [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	0	67,299,602
Class B Common Stock [Member] | Redeemable Convertible Preferred Stock [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	0	198,274,933
Class B Common Stock [Member] | Issuance of Common Stock Upon Early Exercise of Options Unvested [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	0	7,894,144
Class B Common Stock [Member] | Restricted Stock Units [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	0	0
Class B Common Stock [Member] | Warrant [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	0	0