Commitments and Contingencies - Additional Information (Details) (USD $)	1 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2013 sqft	Sep. 30, 2014	Dec. 31, 2013 sqft
Commitments And Contingencies Disclosure [Abstract]
Lease period	3 years
Area of property leased	6,837		6,837
Monthly lease payments	$ 31,000
Rent abatement	31,000		31,000
Lease commenced and rental payments period	2014-01
Cash-collateralized irrevocable standby letter of credit	125,345		125,345
Rent expense associated with lease			0
Capital lease term		3 years
Capital lease commencement period		2014-02
Contract cost incurred in research and development activities		$ 6,628,384	$ 4,477,081