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Income Taxes - Unrecognized Tax (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Income Tax Disclosure [Abstract]      
Balance as of July 1 $ 113 $ 66 $ 66
Additions based on tax positions taken during the current period 216 47 0
Balance as of June 30 $ 329 $ 113 $ 66