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CONTINGENCIES - Additional Information (Detail) - USD ($)
$ in Thousands
9 Months Ended
Dec. 15, 2017
Apr. 30, 2019
Apr. 30, 2018
Contingencies [Line Items]      
Proceeds from issuance of preferred stock   $ 0 $ 35,000
Purchase Agreement | SPHG Holdings | Series C Convertible Preferred Stock      
Contingencies [Line Items]      
Proceeds from issuance of preferred stock $ 35,000