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Supplemental Financial Information - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss)    
Cumulative foreign currency translation adjustment $ 903 $ 1,237
Defined benefit pension obligation (144) (144)
Accumulated other comprehensive income $ 759 $ 1,093