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

Segment disclosures - Revenue based on customer location (Details)

v3.19.3.a.u2
Segment disclosures - Revenue based on customer location (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of geographical areas [line items]    
Revenue $ 318 $ 463
United States    
Disclosure of geographical areas [line items]    
Revenue 200 345
China    
Disclosure of geographical areas [line items]    
Revenue $ 118 $ 118