Nature of the Business (Details 2) (Loan Agreement with Hercules, USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended
	Nov. 08, 2012	Dec. 31, 2012
Loan Agreement with Hercules
Nature of the business
Initial term loan advance	$ 25.0
Additional term loan which closed on December 14, 2012	15.0
Net proceeds from loan		$ 39.6