Information About Segment and Geographic Areas (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Schedule of revenue and long-lived tangible assets by geographic area          
Revenue $ 26,551 $ 28,326 $ 82,402 $ 89,803  
Long-lived tangible assets 13,244   13,244   11,043
United States [Member]
         
Schedule of revenue and long-lived tangible assets by geographic area          
Revenue 26,386 28,152 81,883 89,307  
Long-lived tangible assets 12,984   12,984   10,638
United Kingdom [Member]
         
Schedule of revenue and long-lived tangible assets by geographic area          
Revenue 165 174 519 496  
Netherlands [Member]
         
Schedule of revenue and long-lived tangible assets by geographic area          
Long-lived tangible assets $ 260   $ 260   $ 405