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Condensed Consolidated Balance Sheets (Unaudited) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Current assets    
Cash and cash equivalents $ 27,735 $ 23,726
Accounts receivables 111 144
Inventories, net 963 1,105
Prepaid expenses and other current assets 1,200 1,457
Total current assets 30,009 26,432
Property, plant and equipment, net 3,293 4,042
Total assets 33,302 30,474
Current liabilities    
Accounts payable 684 939
Accrued expenses 3,375 5,790
Warrant liability 863 3,427
Total current liabilities 4,922 10,156
Long term liabilities    
Deferred revenue 7 309
Accrued expenses 490 0
Total long term liabilities 497 309
Commitments and contingencies      
Stockholders' equity    
Preferred stock, $.01 par value; 10,000,000 shares authorized; no shares issued and outstanding at September 30, 2013 and December 31, 2012 0 0
Common stock, $.01 par value; 170,000,000 shares authorized; 103,318,021 and 76,849,033 shares issued and 103,289,921 and 76,820,933 outstanding at September 30, 2013 and December 31, 2012, respectively 1,033 768
Additional paid-in capital 250,821 218,063
Accumulated deficit (224,341) (198,808)
Treasury stock, at cost; 28,100 shares at September 30, 2013 and December 31, 2012 (51) (51)
Accumulated other comprehensive income 421 37
Total stockholders' equity 27,883 20,009
Total liabilities and stockholders' equity $ 33,302 $ 30,474