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Property and Equipment (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Property, Plant and Equipment [Line Items]          
Property and equipment $ 2,654,149   $ 2,654,149   $ 2,540,868
Less accumulated depreciation (1,724,251)   (1,724,251)   (1,583,642)
Property and equipment, net 929,898   929,898   957,226
Depreciation of property and equipment 71,191 $ 69,560 141,631 $ 138,317  
Furniture and Fixtures          
Property, Plant and Equipment [Line Items]          
Property and equipment 340,850   340,850   334,300
Laboratory Equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment 1,393,628   1,393,628   1,389,036
Office Equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment 11,085   11,085   11,085
Computer Equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment 294,350   294,350   233,282
Leasehold Improvements          
Property, Plant and Equipment [Line Items]          
Property and equipment $ 614,236   $ 614,236   $ 573,165