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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Summary of Significant Accounting Policies (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net Loss per Common Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	6,837,448	5,857,926	4,902,451
Accounting Standards Adopted [Abstract]
Tax benefit	$ (2,586,057)	$ (1,845,986)	$ (1,107,405)
Maximum [Member]
Property and Equipment [Abstract]
Estimated useful lives of property and equipment	5 years
Minimum [Member]
Property and Equipment [Abstract]
Estimated useful lives of property and equipment	3 years
Stock Options to Purchase Common Stock [Member]
Net Loss per Common Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	6,462,795	5,316,511	4,302,267
Warrants to Purchase Common Stock [Member]
Net Loss per Common Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	374,653	541,415	600,184
ASU 2016 - 09 [Member]
Accounting Standards Adopted [Abstract]
Tax benefit	$ (84,786)