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Intangible assets - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about intangible assets [line items]    
Amortization expense $ 2,354,000 $ 2,309,000
Disposals 7,311,000  
Impairment loss recognised in profit or loss, intangible assets other than goodwill   1,200,000
Net realizable value   0
Cost    
Disclosure of detailed information about intangible assets [line items]    
Amortization expense 0 0
Disposals 9,138,000  
Impairment loss recognised in profit or loss, intangible assets other than goodwill   $ 0
Power Manager Business | Cost    
Disclosure of detailed information about intangible assets [line items]    
Disposals $ (7,311,000)