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Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Oct. 31, 2019
Apr. 30, 2019
Oct. 31, 2018
Apr. 30, 2018
Cash and Cash Equivalents [Abstract]        
Cash and cash equivalents $ 7,647 $ 10,647 $ 9,477  
Restricted cash 1,951 509 679  
Total cash, cash equivalents and restricted cash $ 9,598 $ 11,156 $ 10,156 $ 10,958