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CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 750 $ 1,384
Short-term investments 21,030 12,717
Grant and other receivables 381 379
Prepaid expenses 1,052 251
Other current assets 148 86
Total current assets 23,361 14,817
Property and equipment, net 846 939
Restricted cash 679 679
Other assets 408 100
Total assets 25,294 16,535
Current liabilities:    
Accounts payable 4,156 2,329
Accrued expenses 6,250 3,944
Current portion of notes payable, net of discount 3,991 5,600
Total current liabilities 14,397 11,873
Notes payable, net of current portion and discount 28,551 14,898
Deferred rent 8,935 8,148
Commitments and contingencies (Note 8)      
Shareholders’ equity:    
Preferred stock, par value $0.01 per share: Authorized shares - 20,000,000 at September 30, 2014 (unaudited) and December 31, 2013; Issued and outstanding shares—none      
Common stock, par value $0.01 per share: Authorized shares - 150,000,000 at September 30, 2014 (unaudited) and December 31, 2013; Issued and outstanding shares—34,022,145 and 30,359,508 at September 30, 2014 (unaudited) and December 31, 2013, respectively 340 304
Additional paid-in capital 280,404 235,685
Accumulated deficit (307,333) (254,373)
Total shareholders’ deficit (26,589) (18,384)
Total liabilities and shareholders’ equity $ 25,294 $ 16,535