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4. PROPERTY AND EQUIPMENT

6 Months Ended

Oct. 31, 2013

Property, Plant and Equipment [Abstract]

Property and equipment, net, consists of the following at October 31, 2013 and April 30, 2013:

	October 31, 2013			April 30, 2013
Leasehold improvements	$	1,453,000		$	1,383,000
Laboratory equipment		5,493,000			5,441,000
Furniture, fixtures, office equipment and software		2,635,000			2,627,000
		9,581,000			9,451,000
Less accumulated depreciation and amortization		(7,266,000	)		(6,773,000	)
Property and equipment, net	$	2,315,000		$	2,678,000

Depreciation and amortization expense for three and six months ended October 31, 2013 was $236,000 and $493,000, respectively, and $266,000 and $526,000 for the three and six months ended October 31, 2012, respectively.

- Definition

The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures.

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