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Accrued expenses and other current liabilities (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Nov. 30, 2016
USD ($)
item
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Accrued expenses and other current liabilities          
Accruals for services provided by vendors-not yet billed $ 4,150     $ 4,150 $ 3,717
Extera claim         1,445
Personnel related accruals 4,381     4,381 3,250
Social security and other taxes 1,178     1,178 877
Other current liabilities 57     57 574
Total 9,766     9,766 $ 9,863
Number of executives agreed for termination benefits | item   4      
Severance costs   $ 1,100      
Non-cash share-based payment expenses related to accelerated vesting of performance share units granted       $ 200  
Forecast          
Accrued expenses and other current liabilities          
Severance costs     $ 500    
Selling, general and administrative expense          
Accrued expenses and other current liabilities          
Severance costs   200      
Research and development expenses          
Accrued expenses and other current liabilities          
Severance costs   $ 900      
Arbitration proceedings with Extera Partners LLC ("Extera") | Selling, general and administrative expense          
Accrued expenses and other current liabilities          
Arbitration settlement expenses $ 2,900