Net Loss per Share Attributable to Common Stockholders - Common Stock Equivalents Excluded from Calculation of Diluted Net Loss Per Share (Details) - Class A Common Stock [Member] - shares	6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share Basic [Line Items]
Outstanding stock options	100,715,527	93,278,289
ESPP [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	2,863,702	0
Stock Option Activity [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	69,845,695	64,701,181
Restricted Stock Units [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	24,961,669	3,511,500
Shares subject to vesting [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	3,044,461	0
Warrants [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	0	25,065,608