Commitments and Contingencies (Details) - USD ($)	1 Months Ended
	Nov. 30, 2014	May 31, 2013	Aug. 31, 2010	May 31, 2015	Jan. 01, 2011
Operating lease entered into August 2010 | Office and laboratory space
Leases
Term of lease			5 years
Security deposit				$ 240,000	$ 400,000
Operating lease entered into May 2013 | Office, laboratory and manufacturing space
Leases
Term of lease		2 years
Operating lease entered into November 2014 | Laboratory Space
Leases
Term of lease	6 years
Security deposit	$ 281,000
Space build-out costs paid	1,400,000
Space build-out costs to be paid by landlord	$ 2,200,000
License Agreement | Operating lease entered into November 2014 | Office Space
Leases
Term of lease	2 years
Security deposit	$ 50,000