XML 60 R48.htm IDEA: XBRL DOCUMENT v3.7.0.1
Stock-Based Compensation - Summary of Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
May 31, 2017
May 31, 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
Weighted Average Exercise Price, Options outstanding, Beginning balance $ 3.28  
Number of Shares, Vested and exercisable options 45,000  
Weighted Average Exercise Price, Granted $ 11.75 $ 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 4 months 24 days 9 years 1 month 20 days
Weighted Average Remaining Contractual Term, Vested and exercisable options 8 years 1 month 20 days  
Aggregate Intrinsic Value, Options outstanding, Ending balance $ 128 $ 1,584
Aggregate Intrinsic Value, Vested and exercisable options $ 89