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Stock-Based Compensation - Summary of Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended
Dec. 03, 2017
May 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Number of Shares, Options outstanding, Beginning balance 274,000  
Number of Shares, Granted 57,000  
Number of Shares, Options outstanding, Ending balance 331,000 274,000
Number of Shares, Vested and exercisable options 90,000  
Weighted Average Exercise Price, Options outstanding, Beginning balance $ 4.79  
Weighted Average Exercise Price, Granted 6.15  
Weighted Average Exercise Price, Options outstanding, Ending balance 5.03 $ 4.79
Weighted Average Exercise Price, Vested and exercisable options $ 3.54  
Weighted Average Remaining Contractual Term, Options outstanding 8 years 2 months 8 days 8 years 4 months 24 days
Weighted Average Remaining Contractual Term, Vested and exercisable options 7 years 7 months 28 days  
Aggregate Intrinsic Value, Options outstanding, Ending balance $ 2,470 $ 128
Aggregate Intrinsic Value, Vested and exercisable options $ 805