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Segment Information (Tables)
12 Months Ended
Dec. 31, 2012
Segment Information [Abstract]  
Schedule of Financial Information by Geographic Area
    Year Ended December 31,  
Revenue:   2011     2012  
United States   $ 16,434,526     $ 14,238,993  
Europe     5,185,302       3,304,251  
Japan     1,022,900       1,193,425  
    $ 22,642,728     $ 18,736,669  

 

    December 31,     December 31,  
Long-lived assets:   2011     2012  
United States   $ 1,112,102     $ 1,598,607  
    $ 1,112,102     $ 1,598,607