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Segment Information and Concentrations - Revenue by geographic areas (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Revenues: $ 4,391,072 $ 4,435,431 $ 8,186,411 $ 8,700,606
United States
       
Revenues: 2,682,077 2,577,630 6,298,084 5,804,072
Europe
       
Revenues: 745,070 873,147 1,234,373 1,484,332
Asia and rest of world
       
Revenues: $ 368,192 $ 814,398 $ 653,954 $ 1,412,202