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

Segment disclosures - revenue based on customer location (Details)

v3.19.1
Segment disclosures - revenue based on customer location (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of geographical areas [line items]    
Revenue $ 463 $ 418
United States    
Disclosure of geographical areas [line items]    
Revenue 345 300
China    
Disclosure of geographical areas [line items]    
Revenue $ 118 $ 118