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Stock-Based Compensation - Summary of Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Number of Shares, Options outstanding, Beginning balance 225,000  
Number of Shares, Granted 49,000 225,000
Number of Shares, Options outstanding, Ending balance 274,000 225,000
Number of Shares, Vested and exercisable options 45,000  
Weighted Average Exercise Price, Options outstanding, Beginning balance $ 3.28 $ 0
Weighted Average Exercise Price, Granted 10.23 3.28
Weighted Average Exercise Price, Options outstanding, Ending balance 4.79 $ 3.28
Weighted Average Exercise Price, Vested and exercisable options $ 3.28  
Weighted Average Remaining Contractual Term, Options outstanding 8 years 7 months 24 days 9 years 4 months 21 days
Weighted Average Remaining Contractual Term, Vested and exercisable options 8 years 4 months 21 days  
Aggregate Intrinsic Value, Options outstanding, Ending balance $ 1,988 $ 169
Aggregate Intrinsic Value, Vested and exercisable options $ 395