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Property and equipment (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]    
Total $ 29,782 $ 42,143
Less accumulated depreciation and amortization (23,699) (31,487)
Property, Plant and Equipment, Net 6,083 10,656
Equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Total 17,327 23,798
Furniture and Office Equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Total 2,600 3,400
Leasehold Improvements [Member]
    
Property, Plant and Equipment [Line Items]    
Total 5,810 7,362
Software [Member]
    
Property, Plant and Equipment [Line Items]    
Total $ 4,045 $ 7,583