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STOCK-BASED COMPENSATION - Aggregate Intrinsic Value (Details) - 2013 Equity Incentive Plan
$ in Thousands
Jun. 30, 2018
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding and exercisable $ 17,091
Expected to vest 3,398
Total outstanding 20,489
Exercised during the year ended June 30, 2017 $ 1,157