CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jan. 31, 2012	Apr. 30, 2011
ASSETS
Cash and cash equivalents	$ 6,482	$ 10,457
Accounts receivable	497	585
Grant receivable	505	517
Prepaid expenses and other current assets	110	276
Total current assets	7,594	11,835
Restricted cash	150	0
Property and equipment, net	452	146
Goodwill	669	669
Total assets	8,865	12,650
LIABILITIES, REDEEMABLE COMMON STOCK AND STOCKHOLDERS' EQUITY (DEFICIT)
Accounts payable	1,623	1,580
Accrued liabilities	344	302
Deferred revenue	1,501	1,618
Total current liabilities	3,468	3,500
Warrant liability	618	972
Total liabilities	4,086	4,472
Commitments and Contingencies:
Redeemable common stock; $0.001 par value; 12,533,333 contingently puttable common shares outstanding as of January 31, 2012 and April 30, 2011	8,159	8,159
Stockholders' equity (deficit):
Preferred stock, $10 par value; 56,075 shares authorized; no shares issued and outstanding as of January 31, 2012 and April 30, 2011	0	0
Common stock, $.001 par value; 125,000,000 shares authorized, including redeemable common stock, 37,451,691 and 36,956,667 shares issued and 34,477,955 and 33,870,000 shares outstanding as of January 31, 2012 and April 30, 2011, respectively	38	37
Treasury stock, at cost, 3,236,000 common shares as of January 31, 2012 and April 30, 2011, respectively	(1,252)	(1,252)
Additional paid-in capital	20,494	17,784
Accumulated deficit	(22,593)	(16,482)
Accumulated other comprehensive loss	(67)	(68)
Total stockholders' deficit (equity)	(3,380)	19
Total liabilities, redeemable common stock and stockholders' equity (deficit)	$ 8,865	$ 12,650