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COMMITMENTS AND CONTINGENCIES - Operating Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Operating leases      
Rental expense $ 603 $ 468 $ 262
Future minimum rental payments      
2018 484    
2019 314    
2020 114    
2021 87    
2022 72    
and thereafter 11    
Total $ 1,082