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Condensed Consolidated Balance Sheets (Unaudited) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Current assets    
Cash and cash equivalents $ 42,804 $ 23,726
Accounts receivables 81 144
Inventories 1,190 1,105
Prepaid expenses and other current assets 1,667 1,457
Total current assets 45,742 26,432
Property, plant and equipment, net 3,766 4,042
Total assets 49,508 30,474
Current liabilities    
Accounts payable 1,511 939
Accrued expenses 4,078 5,790
Warrant liability 5,485 3,427
Total current liabilities 11,074 10,156
Deferred revenue 9 309
Commitments and contingencies      
Stockholders' equity    
Preferred stock, $.01 par value; 10,000,000 shares authorized; no shares issued and outstanding at March 31, 2013 and December 31, 2012 0 0
Common stock, $.01 par value; 170,000,000 shares authorized; 91,212,524 and 76,849,033 shares issued and 91,184,424 and 76,820,933 outstanding at March 31, 2013 and December 31, 2012, respectively 912 768
Common stock to be issued 56  
Additional paid-in capital 248,760 218,063
Accumulated deficit (211,653) (198,808)
Treasury stock, at cost; 28,100 shares at March 31, 2013 and December 31, 2012 (51) (51)
Accumulated other comprehensive income 401 37
Total stockholders' equity 38,425 20,009
Total liabilities and stockholders' equity $ 49,508 $ 30,474