Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Jan. 31, 2024	Jan. 31, 2023
Cash flows from operating activities
Net loss	$ (81,995)	$ (66,602)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	597	530
Stock-based compensation expense	9,172	7,481
Realized (gain) loss from sale of marketable securities	(1,130)	84
Non-cash operating lease expense	(11)	52
Amortization of premium on marketable securities	88	890
Foreign currency exchange loss (gain)	596	(1,339)
Changes in operating assets and liabilities:
Research and development tax credit receivable	(6,215)	2,049
Prepaid expenses and other assets	906	4,440
Accounts payable	(1,778)	(1,911)
Accrued expenses	5,644	1,701
Net cash used in operating activities	(74,126)	(52,625)
Cash flows from investing activities
Purchases of marketable securities	(47,687)	(63,757)
Sales and maturities of marketable securities	89,475	112,509
Acquisition of property and equipment	(27)	(1,127)
Website development costs	(294)
Net cash provided by investing activities	41,467	47,625
Cash flows from financing activities
Issuance of common stock from equity incentive plans	616	482
Issuance of common stock, net of offering expenses of $0.3 million		56,582
Issuance of pre-funded warrants, net of offering expenses		1,085
Net cash provided by financing activities	616	58,149
Effect of exchange rate changes on cash and cash equivalents	(1,139)	1,168
Net (decrease) increase in cash and cash equivalents	(33,182)	54,317
Cash and cash equivalents at beginning of period	56,238	30,732
Cash and cash equivalents at end of period	$ 23,056	85,049
Supplemental disclosures of non-cash activities:
Right of use assets obtained in exchange for operating lease liabilities		$ 1,192