Summary of significant accounting policies (Tables)
 6 Months Ended
Jun. 30, 2012
Summary of Geographic Information Relating to Sources, by Nation, of Company's Total Net Revenues and Long-lived Tangible Assets

The table below summarizes geographic information relating to the sources, by nation, of the Company’s total revenues for the six months ended June 30, 2012 and 2011 and long-lived tangible assets as of June 30, 2012 and December 31, 2011 (dollars in thousands):

       
  For The Six Months Ended June 30,
     2012   % of Total   2011   % of Total
Revenue
                                    
United States   $       2,777             97 %    $       3,151       100 % 
Canada     94       3 %      —       0 % 
Total International     94       3 %      —       0 % 
Total   $ 2,871       100 %    $ 3,151             100 % 

       
  As of June 30,   As of December 31,
     2012   % of Total   2011   % of Total
Long-lived assets
                                    
United States   $       7,549       100 %    $       8,276       100 % 
Canada     32       0 %      —       0 % 
Total International     32       0 %      —       0 % 
Total   $ 7,581            100 %    $ 8,276             100 %