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

Contingent consideration - Narrative (Details)

v3.19.1
Contingent consideration - Narrative (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
milestone
Dec. 31, 2016
USD ($)
Sep. 20, 2013
USD ($)
Disclosure of contingent liabilities [line items]        
Fair value of contingent consideration $ 4,028,000   $ 3,792,000  
Revaluation of contingent consideration $ 236,000 $ 502,000    
Bottom of range        
Disclosure of contingent liabilities [line items]        
Probability of the success of milestone achievement 50.00% 50.00%    
Top of range        
Disclosure of contingent liabilities [line items]        
Probability of the success of milestone achievement 74.00% 75.00%    
Level 3 of fair value hierarchy        
Disclosure of contingent liabilities [line items]        
Effect of 10% increase in probability of success $ 622,000      
Effect of 10% decrease in probability of success 620,000      
Effect of 12% increase in discount rate 172,000      
Effect of 8% decrease in discount rate 185,000      
Joint ventures where entity is venturer        
Disclosure of contingent liabilities [line items]        
Amount of contingent consideration       $ 10,000,000
Payment for contingent consideration liability $ 0 $ 2,150,000    
Number of milestones achieved | milestone   2    
Income approach        
Disclosure of contingent liabilities [line items]        
Discount rate used in estimate in the value of contingent consideration 10.00% 10.00%