CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Apr. 30, 2012	Apr. 30, 2011
ASSETS
Cash and cash equivalents	$ 4,754	$ 10,457
Accounts receivable, net	584	585
Grant receivable	0	517
Prepaid expenses and other current assets	205	276
Total current assets	5,543	11,835
Restricted cash	150	0
Property and equipment, net	560	146
Goodwill	669	669
Total assets	6,922	12,650
LIABILITIES, REDEEMABLE COMMON STOCK AND STOCKHOLDERS' EQUITY (DEFICIT)
Accounts payable	1,676	1,580
Accrued liabilities	625	302
Deferred revenue	1,185	1,618
Total current liabilities	3,486	3,500
Warrant liability	555	972
Total liabilities	4,041	4,472
Commitments and contingencies
Redeemable common stock; $0.001 par value; 12,533,333 contingently puttable common shares outstanding as of April 30, 2012 and 2011	8,159	8,159
Stockholders' equity (deficit):
Preferred stock, $10 par value; 56,075 shares authorized; no shares issued and outstanding as of April 30, 2012 and 2011	0	0
Common stock, $.001 par value; 125,000,000 shares authorized including redeemable common stock; 37,740,345 and 36,956,667 shares issued and 34,529,000 and 33,870,000 shares outstanding as of April 30, 2012 and 2011, respectively	38	37
Treasury stock, at cost, 3,236,000 common shares as of April 30, 2012 and 2011	(1,252)	(1,252)
Additional paid-in capital	21,204	17,784
Accumulated deficit	(25,143)	(16,482)
Accumulated other comprehensive loss	(125)	(68)
Total stockholders' equity (deficit)	(5,278)	19
Total liabilities, redeemable common stock and stockholders' equity (deficit)	$ 6,922	$ 12,650