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Equity - Capital contribution private placements (Details) - USD ($)
12 Months Ended
Sep. 04, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Subsidiary, Sale of Stock [Line Items]        
Aggregate offering price   $ 200,000 $ 0 $ 0
Warrants to purchase ordinary shares   4,667    
Exercise price   $ 4.89 $ 0.00  
Term of warrant   4 years 10 months 21 days 0 years  
Private placements | Boustead        
Subsidiary, Sale of Stock [Line Items]        
Number of shares issued 66,667      
Purchase price per share $ 3.00      
Aggregate offering price $ 200,000      
Over-Allotment Option [Member] | Boustead Securities        
Subsidiary, Sale of Stock [Line Items]        
Commission to placement agent $ 10,000      
Warrants to purchase ordinary shares 4,667      
Exercise price $ 3.00      
Term of warrant 5 years