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Summary of Significant Accounting Policies - Segment Information (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Jun. 30, 2019
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-Lived Assets $ 10,126 $ 9,772
Japan    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-Lived Assets $ 1,070 $ 955