Consolidated Balance Sheets - USD ($) $ in Thousands	Apr. 30, 2020	Apr. 30, 2019
Current assets:
Cash and cash equivalents	$ 15,789	$ 32,006
Marketable securities	51,925	68,805
Research and development tax credit receivable	16,527	11,315
Prepaid expenses and other current assets	4,455	3,420
Total current assets	88,696	115,546
Property and equipment, net	2,043	2,413
Right of use assets	1,612
Other assets	178	173
Total assets	92,529	118,132
Current liabilities:
Accounts payable	1,677	2,860
Accrued expenses	5,455	5,647
Deferred revenue - current portion		9,545
Lease liability - current portion	588
Total current liabilities	7,720	18,052
Long-term liabilities:
Deferred revenue - net of current portion		3,342
Lease liability - net of current portion	1,057
Total long-term liabilities	1,057	3,342
Commitments and contingencies (Note 8)
Stockholders’ equity:
Common stock, $0.001 par value, 100,000,000 authorized Shares issued and outstanding: 17,845,599 at April 30, 2020 and 17,277,750 at April 30, 2019	18	17
Additional paid-in capital	207,208	191,123
Accumulated deficit	(121,592)	(92,476)
Accumulated other comprehensive loss	(1,882)	(1,926)
Total stockholders’ equity	83,752	96,738
Total liabilities and stockholders’ equity	$ 92,529	$ 118,132