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Income Taxes - Valuation allowance for deferred tax assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Deferred Tax Assets Valuation Allowance [Roll Forward]      
Balance at beginning of period $ 3,403 $ 808 $ 861
Provision for income taxes 306 2,595 (53)
Balance at end of period $ 3,709 $ 3,403 $ 808