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, 2022	Jun. 30, 2021
Class A Common Stock [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	101,792,006	93,866,045
Class A Common Stock [Member] | ESPP [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	3,456,238	0
Class A Common Stock [Member] | Stock Option Activity [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	71,980,548	65,962,668
Class A Common Stock [Member] | Restricted Stock Units [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	23,076,570	2,837,769
Class A Common Stock [Member] | Shares subject to vesting [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	3,278,650	0
Class A Common Stock [Member] | Warrants [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	0	25,065,608
Class B Common Stock [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	101,792,006	93,866,045
Class B Common Stock [Member] | ESPP [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	3,456,238	0
Class B Common Stock [Member] | Stock Option Activity [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	71,980,548	65,962,668
Class B Common Stock [Member] | Restricted Stock Units [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	23,076,570	2,837,769
Class B Common Stock [Member] | Shares subject to vesting [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	3,278,650	0
Class B Common Stock [Member] | Warrants [Member]
Earnings Per Share Basic [Line Items]
Outstanding stock options	0	25,065,608