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Property and equipment (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Total $ 30,198 $ 29,782
Less: accumulated depreciation and amortization (23,802) (23,699)
Property, Plant and Equipment, Net 6,396 6,083
Equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Total 17,070 17,327
Software [Member]
    
Property, Plant and Equipment [Line Items]    
Total 4,641 4,045
Furniture and Office Equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Total 2,668 2,600
Leasehold Improvements [Member]
    
Property, Plant and Equipment [Line Items]    
Total $ 5,819 $ 5,810