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Debt - Movement in debt (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about borrowings [line items]    
Balance at December 31, 2017 $ 69,302 $ 39,871
Loss on modifications   653
Proceeds from debentures 46,000  
Transaction costs paid   (1,338)
Transaction costs paid (2,490)  
Portion allocated to equity (7,141)  
Transaction costs allocated to equity 389  
Amortization of transaction costs , discount 475 116
Drawdowns 40,000 30,000
Balance at December 31, 2018 146,535 69,302
Term Credit Facility [member]    
Disclosure of detailed information about borrowings [line items]    
Balance at December 31, 2017 69,302 39,871
Loss on modifications   653
Transaction costs paid   (1,338)
Amortization of transaction costs , discount 128 116
Drawdowns 40,000 30,000
Balance at December 31, 2018 109,430 $ 69,302
Debentures [Member]    
Disclosure of detailed information about borrowings [line items]    
Proceeds from debentures 46,000  
Transaction costs paid (2,490)  
Portion allocated to equity (7,141)  
Transaction costs allocated to equity 389  
Amortization of transaction costs , discount 347  
Balance at December 31, 2018 $ 37,105