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