Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2018
Cash flows from operating activities:
Net loss	$ (29,116)	$ (20,816)	$ (15,805)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	512	378	180
Stock-based compensation expense	4,448	2,966	1,060
Realized gain from sale of marketable securities	(300)	(23)
Non-cash operating lease expense	13
Amortization of premium on available for sale securities	193
Foreign currency exchange (gain) loss	74	(80)	(651)
Changes in operating assets and liabilities:
Research and development tax credit receivable	(5,781)	(4,883)	(4,256)
Grants and other receivables			319
Prepaid expenses and other current assets	(1,112)	(1,979)	(746)
Other assets	(5)		(123)
Accounts payable	(1,004)	1,534	217
Accrued expenses	(48)	2,665	1,132
Deferred revenue	(12,690)	(16,127)	29,231
Net cash (used in) provided by operating activities	(44,816)	(36,365)	10,558
Cash flows from investing activities:
Purchases of available for sale securities	(49,797)	(79,889)
Sales and maturities of available for sale securities	66,770	11,548
Acquisition of property and equipment	(220)	(1,081)	(1,427)
Net cash provided by (used in) investing activities	16,753	(69,422)	(1,427)
Cash flows from financing activities:
Issuance of common stock, net of offering expenses	11,422	87,910	9,137
Issuance of common stock from equity incentive plans	216	242
Finance lease principal payments	(54)	(209)	(151)
Net cash provided by financing activities	11,584	87,943	8,986
Effect of exchange rate changes on cash and cash equivalents	262	(1,205)	1,988
Net (decrease) increase in cash and cash equivalents	(16,217)	(19,049)	20,105
Cash and cash equivalents, beginning year	32,006	51,055	30,950
Cash and cash equivalents, end of year	15,789	$ 32,006	51,055
Supplemental disclosures of cash flow information:
Right of use assets obtained in exchange for operating lease liabilities	$ 309
Capital leases			513
Acquisition of property and equipment in accounts payable			$ 291

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