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CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares
Feb. 28, 2019
May 31, 2018
Statement of Financial Position [Abstract]    
Common stock subject to possible redemption, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock subject to possible redemption, shares 0 4,560,757
Preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Preferred stock, authorized 1,000,000 1,000,000
Preferred stock, issued 0 0
Preferred stock, outstanding 0 0
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, authorized 20,000,000 20,000,000
Common stock, issued 6,313,038 2,252,743
Common stock, outstanding 6,313,038 2,252,743
Common stock issuable 2,030,000