Summary of Significant Accounting Policies (Tables)

3 Months Ended

Jul. 31, 2020

Accounting Policies [Abstract]

Schedule of Potential Dilutive Common Share Equivalents

Potential dilutive common share equivalents consist of:

	July 31,
	2020		2019
Stock options and awards		2,991,653		2,289,947

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 July 31, 2020 and April 30, 2020 (in thousands):

							Balance at
	Level 1		Level 2		Level 3		July 31, 2020
Cash equivalents	$	2,602	$	—	$	—	$	2,602
Marketable securities:
Corporate debt securities		—		34,417		—		34,417
U.S. government agency securities		—		11,900		—		11,900
	$	2,602	$	46,317	$	—	$	48,919

							Balance at
	Level 1		Level 2		Level 3		April 30, 2020
Cash equivalents	$	650	$	—	$	—	$	650
Marketable securities:
Corporate debt securities		—		39,216		—		39,216
U.S. government agency securities		—		12,709		—		12,709
	$	650	$	51,925	$	—	$	52,575