Annual reports filed by certain Canadian issuers pursuant to Section 15(d) and Rule 15d-4

Acquired intellectual property and other intangible assets - (Details)

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Acquired intellectual property and other intangible assets - (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
yr
Dec. 31, 2018
USD ($)
Changes in intangible assets other than goodwill [abstract]    
Opening net book value $ 12,616 $ 14,116
Additions 17 45
Amortization for the year (1,389) (1,545)
Closing net book value $ 11,244 12,616
Estimated useful lives or amortisation rates, intangible assets other than goodwill | yr 8.59  
Cost    
Changes in intangible assets other than goodwill [abstract]    
Opening net book value $ 20,626  
Closing net book value 20,643 20,626
Accumulated impairment    
Changes in intangible assets other than goodwill [abstract]    
Opening net book value (8,010)  
Closing net book value (9,399) (8,010)
Patents    
Changes in intangible assets other than goodwill [abstract]    
Opening net book value 558 773
Additions 17 45
Amortization for the year (104) (260)
Closing net book value 471 558
Patents | Cost    
Changes in intangible assets other than goodwill [abstract]    
Opening net book value 1,551  
Closing net book value 1,568 1,551
Patents | Accumulated impairment    
Changes in intangible assets other than goodwill [abstract]    
Opening net book value (993)  
Closing net book value (1,097) (993)
Acquired intellectual property and reacquired rights    
Changes in intangible assets other than goodwill [abstract]    
Opening net book value 12,058 13,343
Additions 0 0
Amortization for the year (1,285) (1,285)
Closing net book value 10,773 12,058
Acquired intellectual property and reacquired rights | Cost    
Changes in intangible assets other than goodwill [abstract]    
Opening net book value 19,075  
Closing net book value 19,075 19,075
Acquired intellectual property and reacquired rights | Accumulated impairment    
Changes in intangible assets other than goodwill [abstract]    
Opening net book value (7,017)  
Closing net book value $ (8,302) $ (7,017)