4. PROPERTY AND EQUIPMENT (Tables)

9 Months Ended

Jan. 31, 2018

Property, Plant and Equipment [Abstract]

Schedule of property and equipment

	January 31, 2018			April 30, 2017
Leasehold improvements	$	20,579,000		$	20,098,000
Laboratory equipment		10,683,000			10,777,000
Furniture, fixtures, office equipment and software		4,688,000			4,499,000
Construction-in-progress		2,558,000			2,841,000
Total property and equipment		38,508,000			38,215,000
Less accumulated depreciation and amortization		(12,183,000	)		(11,700,000	)
Total property and equipment, net	$	26,325,000		$	26,515,000