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Summary of significant accounting policies - Earnings per share ("EPS") (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Aug. 01, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Mar. 09, 2020
Dec. 30, 2019
Nov. 22, 2019
May 10, 2019
Earnings per share ("EPS")                
Redeemable ordinary shares, shares issued               725,000
Redeemable ordinary shares, shares outstanding               725,000
Incremental common shares attributable to dilutive effect of ordinary shares with redemption rights     623,699 83,151        
Number of warrants     4,667          
Incremental common shares attributable to call options and warrants     1,867          
Floor conversion price of convertible debts issued, that are anti-dilutive (in dollars per share)   $ 1.04            
Vested stock options                
Earnings per share ("EPS")                
Antidilutive securities (in shares) 67,500              
Convertible debt issued on November 22, 2019                
Earnings per share ("EPS")                
Principal value of convertible debts issued, that are anti-dilutive             $ 1.2  
Floor conversion price of convertible debts issued, that are anti-dilutive (in dollars per share)             $ 1.0  
Convertible debt issued on December 30, 2019                
Earnings per share ("EPS")                
Principal value of convertible debts issued, that are anti-dilutive           $ 1.8    
Floor conversion price of convertible debts issued, that are anti-dilutive (in dollars per share)           $ 1.0    
Convertible debt issued on March 9, 2020, one                
Earnings per share ("EPS")                
Principal value of convertible debts issued, that are anti-dilutive         $ 1.0      
Floor conversion price of convertible debts issued, that are anti-dilutive (in dollars per share)         $ 3.0      
Convertible debt issued on March 9, 2020, two                
Earnings per share ("EPS")                
Principal value of convertible debts issued, that are anti-dilutive         $ 0.7      
Floor conversion price of convertible debts issued, that are anti-dilutive (in dollars per share)         $ 3.0      
Contingent shares to be issued pursuant to business combination                
Earnings per share ("EPS")                
Antidilutive securities (in shares)   1,000,000