Organization, Use of Estimates and Basis of Presentation (Details)	3 Months Ended
	Jul. 31, 2014	Jul. 31, 2013
Total common stock equivalents	26,658,954	17,463,122
Restricted Stock [Member]
Total common stock equivalents	0	25,000
Warrant [Member]
Total common stock equivalents	3,276,667	3,276,667
Employee Stock Option [Member]
Total common stock equivalents	23,382,287	14,161,455