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Segment Information and Concentrations - Revenue by geographic areas (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Revenues: $ 4,435,431 $ 4,037,502 $ 8,700,606 $ 7,991,261
United States
       
Revenues: 3,226,442 2,255,519 5,804,072 4,478,578
Europe
       
Revenues: 611,185 1,160,557 1,484,332 2,390,052
Asia and rest of world
       
Revenues: $ 597,804 $ 621,426 $ 1,412,202 $ 1,122,631