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STOCK BASED COMPENSATION - Option activity for company's stock incentive plans (Detail)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
$ / shares
shares
Number of Shares    
Beginning balance (in shares) | shares 137,491  
Exercised (in shares) | shares (36,126)  
Ending balance (in shares) | shares 101,365 137,491
Number of shares, vested, ending balance (in shares) | shares 101,365  
Number of shares, vested and exercisable, ending balance (in shares) | shares 101,365  
Weighted Average Exercise Price    
Beginning balance (in usd per share) | $ / shares $ 9.15  
Exercised (in usd per share) | $ / shares 10.55  
Ending balance (in usd per share) | $ / shares 8.66 $ 9.15
Options, weighted average exercise price, vested, ending balance (in usd per share) | $ / shares 8.66  
Options, weighted average exercise price, vested and exercisable, ending balance (in usd per share) | $ / shares $ 8.66  
Options outstanding, weighted average remaining contractual term, ending balance (in years) 3 years 1 month 13 days 3 years 7 months 13 days
Options, remaining contractual term, vested, ending balance (in years) 3 years 1 month 13 days  
Options, weighted average remaining contractual term, vested and exercisable, ending balance (in years) 3 years 1 month 13 days  
Options outstanding, aggregate intrinsic value, ending balance | $ $ 9,199 $ 10,390
Options, aggregate intrinsic value, vested, ending balance | $ 9,199  
Options, aggregate intrinsic value, vested and exercisable, ending balance | $ $ 9,199