Summary of Significant Accounting Policies (Tables)

12 Months Ended

Apr. 30, 2022

Accounting Policies [Abstract]

Estimated Useful Life of Property and Equipment

Depreciation is provided using the straight-line method over the estimated useful lives of the assets, which are as follows:

Asset Classification	Estimated Useful Life
Machinery and equipment	1-5 Years
Furniture and fixtures	1-5 Years
Computer equipment	3-4 Years
Leasehold improvements	15 Years or term of lease, if shorter

Schedule of Potential Dilutive Common Share Equivalents

Potential dilutive common share equivalents consist of:

	April 30,
	2022		2021		2020
Stock options and awards		3,968,559		2,836,598		2,320,677

Schedule of Cash Equivalents and Marketable Securities Measured at Fair Value

The following tables summarize the cash equivalents and marketable securities measured at fair value on a recurring basis as of April 30, 2022 and 2021:

	Level 1		Level 2		Level 3		Balance at April 30, 2022
Cash equivalents	$	13,735	$	—	$	—	$	13,735
Marketable securities:
Corporate debt securities		—		112,005		—		112,005
U.S. government agency securities		—		23,465		—		23,465
	$	13,735	$	135,470	$	—	$	149,205

	Level 1		Level 2		Level 3		Balance at April 30, 2021
Cash equivalents	$	2,985	$	—	$	—	$	2,985
Marketable securities:
Corporate debt securities		—		157,873		—		157,873
U.S. government agency securities		—		40,464		—		40,464
	$	2,985	$	198,337	$	—	$	201,322