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Property and equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Total $ 25,795 $ 25,849
Less: accumulated depreciation and amortization (21,072) (19,934)
Property, Plant and Equipment, Net 4,723 5,915
Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total 13,437 13,719
Software [Member]    
Property, Plant and Equipment [Line Items]    
Total 5,089 4,863
Furniture and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total 2,313 2,348
Leasehold improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total $ 4,956 $ 4,919