CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		9 Months Ended
		Jan. 31, 2021	Jan. 31, 2020
Cash flows from operating activities:
Net loss		$ (31,646)	$ (38,944)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization		3,189	566
Non-cash operating lease cost		2,474	2,267
Stock-based compensation expense		14,270	5,424
Other		(115)	(324)
Changes in operating assets and liabilities
Accounts receivable	[1]	588	33,744
Prepaid expenses, other current assets and other assets		(6,931)	(6,928)
Accounts payable		7,447	(917)
Accrued compensation and employee benefits		4,303	1,081
Lease liability		(2,636)	(2,344)
Other liabilities		1,213	(397)
Deferred revenue	[2]	2,016	(20,335)
Net cash used in operating activities		(5,828)	(27,107)
Cash flows from investing activities:
Purchase of property and equipment		(1,166)	(1,629)
Capitalized software development costs		0	(581)
Proceeds from sale of non-marketable equity security		725	0
Purchase of investments		(232,287)	(197,067)
Maturity and sale of investments		280,997	58,625
Net cash provided by (used in) investing activities		48,269	(140,652)
Cash flows from financing activities:
Proceeds from initial public offering and private placements, net of underwriting discounts		851,859	0
Proceeds from repayment of shareholder loan		26,003	0
Repurchase of common stock and options in tender offer		0	(3,548)
Payment of deferred offering costs		(6,710)	0
Proceeds from issuance of common stock		0	44,028
Proceeds from exercise of Class A common stock options		13,825	3,846
Net cash provided by financing activities		884,977	119,495
Net increase (decrease) in cash, cash equivalents and restricted cash		927,418	(48,264)
Cash, cash equivalents and restricted cash at beginning of period		33,604	99,107
Cash, cash equivalents and restricted cash at end of period		961,022	50,843
Total cash, cash equivalents and restricted cash		961,022	50,843
Supplemental disclosures of cash flow information—cash paid for income taxes		435	541
Supplemental disclosure of non-cash investing and financing activities:
Purchases of property and equipment included in accounts payable and accrued liabilities		349	0
Deferred offering costs included in accounts payable and accrued liabilities		503	0
Vesting of early exercised stock options		2,073	427
Series G Preferred Stock
Cash flows from financing activities:
Proceeds from issuance of stock, net of issuance costs		0	25,333
Payment of deferred offering costs			(34)
Series H Preferred Stock
Cash flows from financing activities:
Proceeds from issuance of stock, net of issuance costs		$ 0	49,836
Payment of deferred offering costs			$ (164)

[1] Including changes in related party balances of $(780) and $19,826 for the nine months ended January 31, 2021 and 2020, respectively.

[2] Including changes in related party balances of $7,859 and $(8,596) for the nine months ended January 31, 2021 and 2020, respectively.