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Property and equipment (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Total $ 30,087 $ 42,143
Less: accumulated depreciation and amortization (23,756) (31,487)
Property, Plant and Equipment, Net 6,331 10,656
Equipment [Member]
   
Total 17,312 23,798
Software [Member]
   
Total 4,035 7,583
Furniture and equipment [Member]
   
Total 2,646 3,400
Leasehold improvements [Member]
   
Total $ 6,094 $ 7,362