11. SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)

12 Months Ended

Apr. 30, 2016

Quarterly Financial Information Disclosure [Abstract]

Selected quarterly financial information for each of the two most recent fiscal

Selected quarterly financial information for each of the two most recent fiscal years is as follows:

	Quarter Ended
	April 30,			January 31,			October 31,			July 31,			April 30,			January 31,			October 31,			July 31,
	2016			2016			2015			2015			2015			2015			2014			2014
Net  revenues	$	18,783,000		$	6,709,000		$	9,523,000		$	9,671,000		$	9,308,000		$	5,677,000		$	6,300,000		$	5,496,000
Gross profit (a)	$	9,062,000		$	2,776,000		$	4,782,000		$	4,771,000		$	4,550,000		$	2,564,000		$	2,124,000		$	1,913,000
Loss from operations	$	(11,915,000	)	$	(16,867,000	)	$	(13,824,000	)	$	(13,754,000	)	$	(12,169,000	)	$	(13,022,000	)	$	(12,137,000	)	$	(13,171,000	)
Net loss	$	(11,884,000	)	$	(16,847,000	)	$	(13,198,000	)	$	(13,723,000	)	$	(12,135,000	)	$	(12,994,000	)	$	(12,100,000	)	$	(13,129,000	)
Series E preferred stock accumulated dividends (b)	$	(1,380,000	)	$	(1,380,000	)	$	(1,380,000	)	$	(1,378,000	)	$	(1,378,000	)	$	(1,033,000	)	$	(1,031,000	)	$	(1,028,000	)
Net loss attributable to common stockholders	$	(13,264,000	)	$	(18,227,000	)	$	(14,578,000	)	$	(15,101,000	)	$	(13,513,000	)	$	(14,027,000	)	$	(13,131,000	)	$	(14,157,000	)
Basic and diluted loss per common share	$	(0.05	)	$	(0.08	)	$	(0.07	)	$	(0.08	)	$	(0.07	)	$	(0.08	)	$	(0.07	)	$	(0.08	)

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(a)	Gross profit represents contract manufacturing revenue less cost of contract manufacturing.
(b)	Series E preferred stock accumulated dividends include dividends declared for the period (regardless of whether or not the dividends have been paid) and dividends accumulated for the period (regardless of whether or not the dividends have been declared).