Other Long-Term Liablilities (Details 2) (USD $)	3 Months Ended		1 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Sep. 30, 2013	May 31, 2014
REVENUE
Contracts and Grants	$ 144,000	$ 381,000
Rockefeller Development Services Agreement
REVENUE
Approved project plan for the development services			4,800,000
Term of the agreement			3 years
Upfront payment recognized as revenue over the term of the agreement			1,300,000
Contracts and Grants	100,000	400,000
Bristol Meyers Collaborative Arrangement
REVENUE
Term of the agreement				5 years
Upfront payment recognized as revenue over the term of the agreement				5,000,000
Contracts and Grants	$ 300,000
Reimbursement of external costs incurred by the company (as a percent)				50.00%