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Revenue by geographic areas (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Revenues: $ 5,211,742 $ 4,485,253 $ 10,255,528 $ 8,490,997
United States        
Revenues: 4,198,238 3,575,031 8,278,157 6,408,976
Europe        
Revenues: 678,262 716,952 1,415,657 1,400,115
Asia and rest of world        
Revenues: $ 335,242 $ 193,270 $ 561,714 $ 681,906