Quarterly report pursuant to Section 13 or 15(d)

CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (UNAUDITED) (Parenthetical)

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CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (UNAUDITED) (Parenthetical) - USD ($)
3 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Statement of Stockholders' Equity [Abstract]    
Issuance costs $ 105,000 $ 70,000