4. PROPERTY AND EQUIPMENT (Tables)

9 Months Ended

Jan. 31, 2015

Property, Plant and Equipment [Abstract]

PROPERTY AND EQUIPMENT

	January 31, 2015			April 30, 2014
Leasehold improvements	$	1,538,000		$	1,538,000
Laboratory equipment		5,898,000			5,646,000
Furniture, fixtures, office equipment and software		3,891,000			2,679,000
Construction-in-progress (1)		5,582,000			–
		16,909,000			9,863,000
Less accumulated depreciation and amortization		(7,951,000	)		(7,416,000	)
Property and equipment, net	$	8,958,000		$	2,447,000

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(1) Construction-in-progress represents direct costs of construction for a manufacturing cleanroom and related equipment. No interest was incurred or capitalized as construction-in-progress as of January 31, 2015.