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Condensed Consolidated Balance Sheets (Unaudited) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Current assets    
Cash and cash equivalents $ 32,326 $ 23,726
Accounts receivables 59 144
Inventories, net 925 1,105
Prepaid expenses and other current assets 1,589 1,457
Total current assets 34,899 26,432
Property, plant and equipment, net 3,507 4,042
Total assets 38,406 30,474
Current liabilities    
Accounts payable 705 939
Accrued expenses 4,270 5,790
Warrant liability 366 3,427
Total current liabilities 5,341 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 June 30, 2013 and December 31, 2012 0 0
Common stock, $.01 par value; 170,000,000 shares authorized; 96,989,051 and 76,849,033 shares issued and 96,960,951 and 76,820,933 outstanding at June 30, 2013 and December 31, 2012, respectively 970 768
Additional paid-in capital 248,867 218,063
Accumulated deficit (217,136) (198,808)
Treasury stock, at cost; 28,100 shares at June 30, 2013 and December 31, 2012 (51) (51)
Accumulated other comprehensive income 406 37
Total stockholders' equity 33,056 20,009
Total liabilities and stockholders' equity $ 38,406 $ 30,474