XML 89 R69.htm IDEA: XBRL DOCUMENT v3.10.0.1
Property, plant and equipment - Net carrying amounts (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment $ 21,620 $ 15,314
Building under finance lease    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment 5,007 5,819
Computer equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment 1,639 1,020
Furniture and fixtures    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment 67 155
Leasehold improvements    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment 1,019 1,624
Production and test equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment $ 13,888 $ 6,696