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Property and equipment, net - Additional information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment, Net [Abstract]        
Depreciation $ 67,000 $ 51,000 $ 112,000 $ 102,000