Basis of Presentation and Summary of Significant Accounting Policies - Net loss per share - Anti-dilutive securities (Details) - shares	6 Months Ended
	Oct. 31, 2015	Oct. 31, 2014
Anti-dilutive securities	6,906,224	1,933,375
Common stock equivalent of convertible notes
Anti-dilutive securities	300,000	240,000
Common stock equivalent of convertible notes - related parties
Anti-dilutive securities	27,210	51,020
Series A preferred shares
Anti-dilutive securities	2,838,207
Warrant
Anti-dilutive securities	3,358,275	1,385,775
Common shares reserved for series A preferred share dividends
Anti-dilutive securities	46,785
Stock options
Anti-dilutive securities	335,747	265,580