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Disaggregation of revenue (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue $ 96,586 $ 121,288
Products transferred at a point in time    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 53,729 73,840
Products and services transferred over time    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 42,857 47,448
Heavy Duty Motive    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 39,464 63,684
Portable Power    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 7,109 4,468
Material Handling    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 8,010 7,535
Back Up Power    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 2,426 1,933
Technology Solutions    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 39,577 43,668
China    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 30,791 76,558
Europe    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 37,590 26,145
North America    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 23,871 15,425
Other    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue $ 4,334 $ 3,160