CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK, REDEEMABLE CONVERTIBLE CLASS A-1 COMMON STOCK AND STOCKHOLDERS' EQUITY DEFICIT (PARENTHETICAL) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended	12 Months Ended
	Aug. 31, 2019	Jun. 30, 2019	Apr. 30, 2019	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Issuance of Preferred Stock, issuance costs (unaudited)				$ 7,179	$ 0	$ 0
Series G Preferred Stock
Issuance of Preferred Stock, issuance costs (unaudited)		$ 100	$ 300		34	$ 257
Series H Preferred Stock
Issuance of Preferred Stock, issuance costs (unaudited)	$ 200				$ 164