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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (Unaudited) - $ / shares
Apr. 30, 2019
Jan. 31, 2019
Statement Of Financial Position [Abstract]    
Preferred stock, par value $ 0.0001 $ 0.0001
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.0001 $ 0.0001
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 20,600,000 20,300,000
Common stock, shares outstanding 20,600,000 20,300,000