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Property and equipment (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Total $ 30,800 $ 29,782
Less: accumulated depreciation and amortization (24,264) (23,699)
Property, Plant and Equipment, Net 6,536 6,083
Equipment [Member]
   
Property, Plant and Equipment [Line Items]    
Total 17,639 17,327
Software [Member]
   
Property, Plant and Equipment [Line Items]    
Total 4,649 4,045
Furniture and equipment [Member]
   
Property, Plant and Equipment [Line Items]    
Total 2,656 2,600
Leasehold improvements [Member]
   
Property, Plant and Equipment [Line Items]    
Total $ 5,856 $ 5,810