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Fair value measurements - Liabilities measured at fair value on recurring basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Contingent liability in connection with contingent indemnification commitments $ (6,700)  
Other current liabilities | Indemnification agreement    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Contingent liability in connection with contingent indemnification commitments 6,700  
Fair Value, Measurements, Recurring    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Liabilities Fair Value disclosure 393 $ 430
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Liabilities Fair Value disclosure 4 41
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Liabilities Fair Value disclosure 389 389
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3 | Other current liabilities | Indemnification agreement    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Contingent liability in connection with contingent indemnification commitments 6,700  
Rusnano Payment Derivative | Fair Value, Measurements, Recurring    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Liabilities Fair Value disclosure 389 389
Rusnano Payment Derivative | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Liabilities Fair Value disclosure 389 389
Foreign currency forward contracts | Fair Value, Measurements, Recurring    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Liabilities Fair Value disclosure 4 41
Foreign currency forward contracts | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Liabilities Fair Value disclosure $ 4 $ 41