Summary of Significant Accounting Policies (Details) - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net Loss per Common Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	5,857,926	4,902,451	11,835,766
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)	5,316,511	4,302,267	2,445,711
Convertible Preferred Stock to Purchase Common Stock [Member]
Net Loss per Common Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	0	0	8,695,092
Warrants to Purchase Common Stock [Member]
Net Loss per Common Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	541,415	600,184	99,401
Warrants to Purchase Series C Preferred Stock [Member]
Net Loss per Common Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	0	0	338,534
Warrants to Purchase Series C-1 Preferred Stock [Member]
Net Loss per Common Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	0	0	257,028