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Loss on sale of assets - Schedule of sale of assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure on Sale of Assets [Line Items]    
Cash proceeds received in 2018 $ 1,345 $ 981
Proceeds receivable (constrained estimate of earn-out payments) 2,000 0
Loss on sale of assets (4,049) (1,365)
Power Manager assets    
Disclosure on Sale of Assets [Line Items]    
Cash proceeds received in 2018 2,000 0
Note receivable as of December 31, 2018 2,132  
Proceeds receivable (constrained estimate of earn-out payments) 2,000  
Total proceeds (6,132)  
Less: Disposition costs (707) 0
Net proceeds 5,425  
Less: Net book value of disposed assets (9,382)  
Loss on sale of assets $ (3,957) $ 0