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Summary of Significant Accounting Policies - Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Deferred tax liabilities      
Deferred tax liabilities $ 100   $ 200
Income tax expense (benefit)      
Income tax expense (benefit) $ (107) $ 0