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Property and equipment (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]      
Depreciation, Depletion and Amortization $ 3,653,000 $ 3,897,000 $ 3,414,000
Asset Impairment Charges 5,524,000 505,000 0
Synodex [Member]
      
Property, Plant and Equipment [Line Items]      
Impairment of Long-Lived Assets Held-for-use 5,500,000    
Property, Plant and Equipment [Member]
      
Property, Plant and Equipment [Line Items]      
Depreciation, Depletion and Amortization $ 3,000,000 $ 3,100,000 $ 2,800,000