Information About Segment and Geographic Areas (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Schedule of revenue and long-lived tangible assets by geographic area          
Revenue $ 30,807 $ 19,467 $ 61,477 $ 38,161  
Long-lived tangible assets 10,756   10,756   8,301
United States [Member]
         
Schedule of revenue and long-lived tangible assets by geographic area          
Revenue 30,558 19,303 61,073 37,836  
Long-lived tangible assets 10,245   10,245   7,680
United Kingdom [Member]
         
Schedule of revenue and long-lived tangible assets by geographic area          
Revenue 166 164 322 325  
Netherlands [Member]
         
Schedule of revenue and long-lived tangible assets by geographic area          
Long-lived tangible assets $ 511   $ 511   $ 621