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Goodwill and Other Intangible Assets - Carrying Amount of Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Goodwill [Roll Forward]    
Goodwill, Beginning Balance $ 12,692 $ 12,470
Effect of foreign currency changes on goodwill (253) 222
Addition related to the acquisition of Cobalt 19,791  
Goodwill, Ending Balance $ 32,230 $ 12,692