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Summary of Significant Accounting Policies - 10-Q (Details) - USD ($)	1 Months Ended		3 Months Ended		9 Months Ended		18 Months Ended
	Jun. 30, 2015	May 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Mar. 31, 2013	Dec. 31, 2015
Share-based Compensation
Expected term (years)					6 years 3 months
Net (Loss) Income Per Common Share
Net loss			$ (7,854,693)	$ (7,168,071)	$ (23,481,241)	$ (3,887,795)
Basic and diluted net loss per common share (in dollars per share)			$ (0.34)	$ (0.38)	$ (1.14)	$ (0.20)
Basic and diluted weighted average common shares outstanding			23,049,347	19,025,623	20,638,129	18,999,705
Level 1
Fair Value Measurements
Carrying value of cash held in money market fund			$ 44,100,000		$ 44,100,000			$ 45,500,000
Level 2
Fair Value Measurements
Assets measured at fair value levels 2 or 3			0		0			0
Liabilities measured at fair value levels 2 or 3			0		0			0
Level 3
Fair Value Measurements
Assets measured at fair value levels 2 or 3			0		0			0
Liabilities measured at fair value levels 2 or 3			$ 0		$ 0			$ 0
Maximum
Share-based Compensation
Expiration period					10 years
Warrants [Member]
Net (Loss) Income Per Common Share
Anti-dilutive securities			555,412	590,595	555,412	590,595
Stock Options and Restricted Stock Units [Member]
Net (Loss) Income Per Common Share
Anti-dilutive securities			2,815,166	2,250,008	2,815,166	2,250,008
Pfizer | License Agreement | Up-Front Payment Arrangement
Revenue Recognition
Upfront payment revenue recognized							$ 22,500,000
Recognition period of up-front payment							1 year 6 months
Achievement Of Specified Development Milestone | Pfizer | License Agreement
Revenue Recognition
Milestone revenue	$ 20,000,000	$ 15,000,000

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