4. PROPERTY AND EQUIPMENT (Tables)

6 Months Ended

Oct. 31, 2016

Property, Plant and Equipment [Abstract]

PROPERTY AND EQUIPMENT

	October 31, 2016			April 30, 2016
Leasehold improvements	$	19,990,000		$	19,610,000
Laboratory equipment		10,569,000			10,257,000
Furniture, fixtures, office equipment and software		4,227,000			4,045,000
Total property and equipment		34,786,000			33,912,000
Less accumulated depreciation and amortization		(10,829,000	)		(9,610,000	)
Total property and equipment, net	$	23,957,000		$	24,302,000