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Income Taxes - Valuation allowance for deferred tax assets (Details 5) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Deferred Tax Assets Valuation Allowance [Roll Forward]      
Balance at beginning of period $ 4,614 $ 26,622 $ 32,892
Provision for income taxes (4,111) (19,709) (6,270)
Net operating loss utilization (65) (2,299)  
Balance at end of period $ 438 $ 4,614 $ 26,622