CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		3 Months Ended
		Jul. 31, 2021	Jul. 31, 2020
Cash flows from operating activities:
Net (loss) income		$ (37,459)	$ 150
Adjustments to reconcile net (loss) income to net cash provided by operating activities
Depreciation and amortization		1,141	1,028
Non-cash operating lease cost		857	842
Stock-based compensation expense		13,912	2,480
Other		(875)	(100)
Changes in operating assets and liabilities
Accounts receivable	[1]	10,383	(29,588)
Prepaid expenses, other current assets and other assets	[2]	2,097	556
Accounts payable	[3]	(2,067)	(169)
Accrued compensation and employee benefits		(7,072)	(5,047)
Operating lease liabilities		(932)	(886)
Other liabilities	[4]	(3,633)	847
Deferred revenue	[5]	24,670	46,949
Net cash provided by operating activities		1,022	17,062
Cash flows from investing activities:
Purchases of property and equipment		(511)	(654)
Capitalized software development costs		(500)	0
Purchases of investments		(95,948)	(36,970)
Maturities and sales of investments		248,986	109,759
Net cash provided by investing activities		152,027	72,135
Cash flows from financing activities:
Payment of deferred offering costs		(71)	0
Proceeds from exercise of Class A common stock options		5,046	335
Net cash provided by financing activities		4,975	6,678
Net increase in cash, cash equivalents and restricted cash		158,024	95,875
Cash, cash equivalents and restricted cash at beginning of period		116,255	33,604
Cash and cash equivalents		273,779	128,979
Restricted cash included in other assets		500	500
Cash, cash equivalents and restricted cash at end of period		274,279	129,479
Total cash, cash equivalents and restricted cash		274,279	129,479
Supplemental disclosure of cash flow information—cash paid for income taxes		235	138
Supplemental disclosures of non-cash investing and financing activities:
Purchases of property and equipment included in accounts payable and accrued liabilities		326	243
Unpaid liabilities related to intangible purchases		2,500	0
Deferred offering costs included in accounts payable and accrued liabilities		34	0
Vesting of early exercised stock options		1,059	218
Paycheck Protection Program, CARES Act
Cash flows from financing activities:
Proceeds from Payroll Protection Program loan		$ 0	$ 6,343

[1] Including changes in related party balances of $(13,921) and $9 for the three months ended July 31, 2021 and 2020, respectively.

[2] Including changes in related party balances of $(415) and nil for the three months ended July 31, 2021 and 2020, respectively.

[3] Including changes in related party balances of $56 and nil for the three months ended July 31, 2021 and 2020, respectively.

[4] Including changes in related party balances of $(3,309) and nil for the three months ended July 31, 2021 and 2020, respectively.

[5] Including changes in related party balances of $16,940 and $21,190 for the three months ended July 31, 2021 and 2020, respectively.