CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
Balance at Apr. 30, 2014	$ 3,197,000	$ 6,000	$ (1,252,000)	$ 43,323,000	$ (38,880,000)	$ 0
Balance (in shares) at Apr. 30, 2014		5,573,821	269,685
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	2,948,000			2,948,000
Exercise of options and warrants	2,000			2,000
Exercise of options and warrants (in shares)		313
Conversion of convertible notes and accrued interest	2,060,000			2,060,000
Sale and Issuance of common stock	11,160,000	$ 3,000		11,157,000
Sale and Issuance of common stock, net of issuance costs of $880k (in shares)		2,929,778
Issuance of share under anti-dilution provisions	2,000			2,000
Issuance of share under anti-dilution provisions (in shares)		188,704
Stock Option Modification	214,000			214,000
Reclassification of warrant Liability	1,616,000			1,616,000
Net loss	(13,139,820)				(13,140,000)
Balance at Apr. 30, 2015	8,059,000	$ 9,000	$ (1,252,000)	61,322,000	(52,020,000)
Balance (in shares) at Apr. 30, 2015		8,692,616	269,685
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	2,599,000			2,599,000
Payment of issuance costs related to 2015 Private Placement	(18,000)			(18,000)
Sale and Issuance of common stock	44,000			44,000
Sale and Issuance of common stock, net of issuance costs of $880k (in shares)		12,230
Net loss	(10,445,537)				(10,446,000)
Balance at Apr. 30, 2016	$ 238,000	$ 9,000	$ (1,252,000)	$ 63,947,000	$ (62,466,000)	$ 0
Balance (in shares) at Apr. 30, 2016		8,704,846	269,685