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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Jul. 31, 2024
Jul. 31, 2023
Cash flows from operating activities    
Net loss $ (40,443) $ (25,317)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 224 193
Stock-based compensation expense 3,040 3,254
Realized (gain) from sale of marketable securities (317) (314)
Non-cash operating lease expense (5) 6
Amortization of premium on marketable securities 5 62
Foreign currency exchange (gain) (414) (395)
Changes in operating assets and liabilities:    
Research and development tax credit receivable (1,253) (2,084)
Prepaid expenses and other assets (783) (1,003)
Accounts payable 1,502 108
Accrued expenses (1,776) (1,240)
Net cash used in operating activities (40,220) (26,730)
Cash flows from investing activities    
Purchases of marketable securities (983) (25,767)
Sales and maturities of marketable securities 38,230 45,386
Acquisition of property and equipment (21) (6)
Capitalized website development costs (64)  
Net cash provided by investing activities 37,162 19,613
Cash flows from financing activities    
Issuance of common stock from equity incentive plans 3,000 204
Net cash provided by financing activities 3,000 204
Effect of exchange rate changes on cash and cash equivalents 117 84
Net (decrease) increase in cash and cash equivalents 59 (6,829)
Cash and cash equivalents at beginning of period 31,789 56,238
Cash and cash equivalents at end of period $ 31,848 $ 49,409