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Accrued expenses and other current liabilities (Details)
$ in Thousands
 1 Months Ended 3 Months Ended
Jan. 31, 2017
USD ($)
Nov. 30, 2016
USD ($)
item
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Accrued expenses and other current liabilities        
Accruals for services provided by vendors-not yet billed     $ 3,775 $ 4,150
Personnel related accruals     2,247 4,381
Social security and other taxes     1,102 1,178
Other current liabilities     30 57
Total     7,154 $ 9,766
Number of executives agreed for termination benefits | item   4    
Severance costs $ 500 $ 1,100    
Restructuring Reserve        
Beginning Balance $ 1,148   1,148  
Accrued through profit and loss     241  
Payments     (977)  
Currency translation effects     6  
Ending Balance     $ 418