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CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Current assets:    
Cash and cash equivalents $ 4,005 $ 3,278
Short-term investments 20,565 38,715
Grant and other receivables 876 1,479
Prepaid expenses and other current assets 502 282
Total current assets 25,948 43,754
Property and equipment, net 739 1,622
Restricted cash 193 193
Other assets 102 135
Total assets 26,982 45,704
Current liabilities:    
Accounts payable 2,002 2,398
Accrued expenses 5,340 4,567
Deferred revenue 5,748 8,014
Current portion of notes payable 5,895 395
Total current liabilities 18,985 15,374
Notes payable, less current portion 13,551 9,860
Commitments and contingencies      
Shareholders' equity:    
Preferred stock, par value $0.01 per share: Authorized shares-20,000,000 at December 31, 2011 and 2010; Issued and outstanding shares-none      
Common stock, par value $0.01 per share: Authorized shares-150,000,000 at December 31, 2011 and 2010; Issued and outstanding shares-22,430,234 and 21,920,836 at December 31, 2011 and 2010, respectively 224 219
Additional paid-in capital 170,355 167,838
Accumulated deficit (176,133) (147,587)
Total shareholders' (deficit) equity (5,554) 20,470
Total liabilities and shareholders' equity $ 26,982 $ 45,704