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Income Taxes - Valuation allowance for deferred tax assets (Details 5) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Deferred Tax Assets Valuation Allowance [Roll Forward]      
Balance at beginning of period $ 861 $ 438 $ 4,614
Provision for income taxes (53) 423 (4,111)
Net operating loss utilization 0 0 (65)
Balance at end of period $ 808 $ 861 $ 438