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Share-based payment plans - Narrative (Details)
1 Months Ended 9 Months Ended
Jun. 30, 2020
warrant
$ / shares
Sep. 30, 2020
USD ($)
shares
shares
Sep. 30, 2019
USD ($)
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Expense recognized for employee and other services received | $   $ 1,813,000 $ 1,279,000
Stock options, restricted shares and warrants canceled (in shares)   375,731  
Stock options exercised (in shares)   24,828  
Ordinary shares       
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Increase (decrease) in number of shares outstanding (in shares)   24,828  
Issuance of ordinary shares | $   $ 540  
Share premium      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Issuance of ordinary shares | $   $ 31,425  
Restricted share awards (RSA)      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Awards granted (in shares)   1,102,400  
Award vesting period   4 years  
Warrants      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Award vesting period 3 years    
Number of other equity instruments granted in share-based payment arrangement | warrant 252,000    
Weighted average exercise price of other equity instruments exercisable in share-based payment arrangement (in dollars per share) | $ / shares $ 1.51    
Restricted shares      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Vested (in shares)   620,508  
One-year anniversary | Restricted share awards (RSA)      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Award vesting period   1 year  
Award vesting percentage   25.00%  
One-year anniversary alternative | Restricted share awards (RSA)      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Award vesting period   2 years  
Award vesting percentage   50.00%