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Revenue by geographic areas (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Revenues: $ 5,043,786 $ 4,005,744
United States    
Revenues: 4,083,412 2,833,945
Europe    
Revenues: 729,190 683,163
Asia and rest of world    
Revenues: 231,184 488,636
Total    
Revenues: $ 5,043,786 $ 4,005,744