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Debt - Convertible Debenture (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
item
$ / shares
Oct. 08, 2019
USD ($)
Oct. 02, 2019
USD ($)
Disclosure of detailed information about borrowings [line items]      
Proceeds from convertible debenture (note 17(b) $ 46,000    
Debentures classified as equity 7,141    
Deferred income tax expense through equity (1,927)    
Transaction costs 2,490    
Debentures [Member]      
Disclosure of detailed information about borrowings [line items]      
Notional amount   $ 6,000 $ 40,000
Proceeds from convertible debenture (note 17(b) $ 46,000    
Borrowings, interest rate 4.65%    
Conversion price | $ / shares $ 5.00    
Conversion rate 200    
Consecutive trading days | item 20    
Redemption percentage of conversion price 125.00%    
Percentage of principal amount of debt redeemed 95.00%    
Estimated fair value of the debt component $ 38,859    
Expected life 5 years    
Discount rate 8.60%    
Effective interest rate 9.70%    
Debentures classified as equity $ 7,141    
Deferred income tax expense through equity 1,927    
Transaction costs $ 2,490