Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Restricted Stock (Details)

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Stockholders' Equity - Restricted Stock (Details) - Restricted Stock - USD ($)
Apr. 30, 2022
Apr. 30, 2021
Stockholders Equity [Line Items]    
Unvested shares of restricted common stock outstanding (in shares) 0 8,224
Total unrecognized compensation expense $ 0