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STOCK-BASED COMPENSATION - Nonqualified Stock Option Awards (Details) - 2015 Plan - Nonqualified stock options - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jul. 28, 2015
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Stock-Based Compensation        
Options granted     137,786  
Option price     $ 15.00  
Black-Scholes pricing model assumptions        
Risk-free rate   1.93%    
Expected term   6 years 3 months    
Dividend rate   0.00%    
Expected volatility   56.70%    
Certain employees        
Stock-Based Compensation        
Options granted 137,786      
Option price $ 15.00      
Annual vesting percentage 25.00%      
Vesting period (in years) 4 years      
Options forfeited     15,146  
Stock-based compensation   $ 240 $ 243 $ 0