CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jul. 31, 2018	Apr. 30, 2018
Current assets:
Cash and cash equivalents	$ 37,484	$ 42,265
Trade and other receivables	2,951	3,754
Contract assets	4,775	0
Inventories	9,168	16,129
Prepaid expenses	528	679
Assets of discontinued operations	2,014	5,000
Total current assets	56,920	67,827
Property and equipment, net	26,336	26,479
Restricted cash	1,150	1,150
Other assets	302	304
Total assets	84,708	95,760
Current liabilities:
Accounts payable	3,122	1,909
Accrued payroll and related costs	2,030	2,564
Contract liabilities	17,994	27,935
Other current liabilities	609	905
Liabilities of discontinued operations	1,969	4,550
Total current liabilities	25,724	37,863
Deferred rent, less current portion	2,145	2,159
Capital lease, less current portion	93	0
Commitments and contingencies	0	0
STOCKHOLDERS' EQUITY:
Preferred stock $0.001 par value; authorized 5,000,000 shares; 1,647,760 shares issued and outstanding at July 31, 2018 and April 30, 2018, respectively	2	2
Common stock $0.001 par value; authorized 500,000,000 shares; 55,990,274 and 55,689,222 shares issued and outstanding at July 31, 2018 and April 30, 2018, respectively	55	55
Additional paid-in-capital	615,040	614,810
Accumulated deficit	(558,351)	(559,129)
Total stockholders' equity	56,746	55,738
Total liabilities and stockholders' equity	$ 84,708	$ 95,760