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Income taxes - Significant components of deferred taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets:      
Deferred tax asset attributable to carryforward losses $ 59,468 $ 40,236  
Intangible assets 1,621 1,986  
Property, plant and equipment 1,412 1,202  
Deferred revenue 19,997 21,410  
Accrued revenue   962  
Accrued expenses and other current liabilities 144 935  
Gross deferred tax asset 82,642 66,731  
Less valuation allowance (82,642) (65,593)  
Net deferred tax asset   1,138  
Deferred tax liabilities:      
Long-term loan to foreign operation   (1,138)  
Net deferred tax liability   (1,138)  
Valuation Allowance [Abstract]      
Net change in total valuation allowance $ 17,000 15,600  
Tax loss carry-forwards      
Tax loss carry-forward expiration (in years) 9 years    
Tax loss carry-forwards $ 182,000 137,000 $ 175,700
Unrecognized Tax Benefits 0 0 $ 0
2015      
Tax loss carry-forwards      
Tax loss carry-forwards expiring during the year   $ 0  
2016      
Tax loss carry-forwards      
Tax loss carry-forwards expiring during the year 0    
2017      
Tax loss carry-forwards      
Tax loss carry-forwards expiring during the year 21,523    
2018      
Tax loss carry-forwards      
Tax loss carry-forwards expiring during the year 17,579    
2019      
Tax loss carry-forwards      
Tax loss carry-forwards expiring during the year 19,070    
2020      
Tax loss carry-forwards      
Tax loss carry-forwards expiring during the year 17,333    
2021      
Tax loss carry-forwards      
Tax loss carry-forwards expiring during the year $ 13,043