CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		12 Months Ended
		Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Cash flows from operating activities:
Net loss		$ (55,696)	$ (69,378)	$ (33,346)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization		4,297	1,302	550
Non-cash operating lease cost		3,315	3,052	0
Stock-based compensation expense		21,740	8,310	4,267
Impairment on investment		0	1,025	0
Other		(180)	(657)	534
Changes in operating assets and liabilities
Accounts receivable	[1]	(34,690)	32,659	(46,144)
Prepaid expenses, other current assets and other assets	[2]	(14,855)	(4,265)	(1,677)
Accounts payable	[3]	7,450	(1,219)	48
Accrued compensation and employee benefits		8,135	651	4,170
Operating lease liabilities		(3,551)	(3,174)	0
Other liabilities	[4]	11,549	1,343	(533)
Deferred revenue	[5]	14,933	(30,930)	37,255
Net cash used in operating activities		(37,553)	(61,281)	(34,876)
Cash flows from investing activities:
Purchases of property and equipment		(1,628)	(2,298)	(6,811)
Capitalized software development costs		0	(581)	0
Proceeds from sale of non-marketable equity security		725	0	0
Purchases of investments		(1,152,142)	(219,853)	(166,303)
Maturities and sales of investments		385,893	98,659	76,886
Net cash used in investing activities		(767,152)	(124,073)	(96,228)
Cash flows from financing activities:
Proceeds from initial public offering and private placements, net of underwriting discounts		851,859	0	0
Proceeds from repayment of shareholder loan		26,003	0	0
Repurchase of common stock and options in tender offer		0	(3,548)	0
Payment of deferred offering costs		(7,179)	0	0
Proceeds from issuance of common stock		0	44,027	0
Proceeds from exercise of Class A common stock options		16,673	4,203	2,905
Net cash provided by financing activities		887,356	119,851	54,472
Net increase (decrease) in cash, cash equivalents and restricted cash		82,651	(65,503)	(76,632)
Cash, cash equivalents and restricted cash at beginning of period		33,604	99,107	175,739
Cash and cash equivalents		115,355	33,104	98,607
Restricted cash included in other assets		900	500	500
Cash, cash equivalents and restricted cash at end of period		116,255	33,604	99,107
Total cash, cash equivalents and restricted cash		116,255	33,604	99,107
Supplemental disclosure of cash flow information—cash paid for income taxes		550	660	131
Supplemental disclosures of non-cash investing and financing activities:
Purchases of property and equipment included in accounts payable and accrued liabilities		212	417	60
Deferred offering costs included in accounts payable and accrued liabilities		105	0	0
Vesting of early exercised stock options		2,869	655	1,561
Investor
Changes in operating assets and liabilities
Prepaid expenses, other current assets and other assets		(8,264)	0	0
Other liabilities		8,308	0	0
Series G Preferred Stock
Cash flows from financing activities:
Proceeds from issuance of stock, net of issuance costs		0	25,333	51,567
Payment of deferred offering costs			(34)	(257)
Supplemental disclosures of non-cash investing and financing activities:
Series G issuance cost included in accounts payable		0	0	73
Series H Preferred Stock
Cash flows from financing activities:
Proceeds from issuance of stock, net of issuance costs		$ 0	49,836	$ 0
Payment of deferred offering costs			$ (164)

[1] Including changes in related party balances of $(14,930), $19,750, and $(20,000) for the fiscal years ended April 30, 2021, 2020 and 2019, respectively.

[2] Including changes in related party balances of $8,264, nil and nil for the fiscal years ended April 30, 2021, 2020 and 2019, respectively.

[3] Including changes in related party balances of $56, nil and nil for the fiscal years ended April 30, 2021, 2020 and 2019, respectively.

[4] Including changes in related party balances of $8,308, nil and nil for the fiscal years ended April 30, 2021, 2020 and 2019, respectively.

[5] Including changes in related party balances of $6,198, $(18,445), and $19,944 for the fiscal years ended April 30, 2021, 2020, and 2019, respectively.