Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jan. 31, 2022	Apr. 30, 2021
Current assets:
Cash and cash equivalents	$ 45,577	$ 50,592
Marketable securities	149,212	198,337
Research and development tax credit receivable	11,287	10,418
Prepaid expenses and other current assets	8,388	4,917
Total current assets	214,464	264,264
Property and equipment, net	2,215	1,791
Right of use assets	8,180	5,758
Other assets	193	200
Total assets	225,052	272,013
Current liabilities:
Accounts payable	2,185	1,981
Accrued expenses	6,450	6,930
Lease liability - current portion	1,014	863
Total current liabilities	9,649	9,774
Long-term liabilities:
Lease liability - net of current portion	7,467	5,046
Total long-term liabilities	7,467	5,046
Commitments and contingencies (Note 5)
Stockholders’ equity
Common stock, $0.001 par value, 100,000,000 authorized Shares issued and outstanding: 24,537,094 at January 31, 2022 and 24,422,531 at April 30, 2021	24	24
Additional paid-in capital	436,313	426,437
Accumulated deficit	(226,062)	(167,836)
Accumulated other comprehensive loss	(2,339)	(1,432)
Total stockholders’ equity	207,936	257,193
Total liabilities and stockholders’ equity	$ 225,052	$ 272,013