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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Current assets    
Cash and cash equivalents $ 23,726 $ 25,777
Investments - Certificates of deposit 0 4,980
Accounts receivables 144 0
Inventories 1,105 0
Prepaid expenses and other current assets 1,457 1,231
Total current assets 26,432 31,988
Property, plant and equipment, net 4,042 3,253
Total assets 30,474 35,241
Current liabilities    
Accounts payable 939 925
Accrued expenses 5,790 5,473
Warrant liability 3,427 2,439
Total current liabilities 10,156 8,837
Deferred revenue 309 300
Commitments and contingencies      
Stockholders' equity    
Preferred stock, $.01 par value; 10,000,000 shares authorized; no shares issued and outstanding at December 31, 2012 and 2011 0 0
Common stock, $.01 par value; 170,000,000 shares authorized; 76,849,033 and 48,237,630 shares issued and 76,820,933 and 48,016,002 outstanding at December 31, 2012 and December 31, 2011, respectively 768 482
Additional paid-in capital 218,063 172,613
Accumulated deficit (198,808) (146,940)
Treasury stock, at cost; 28,100 shares at December 31, 2012 and December 31, 2011 (51) (51)
Accumulated other comprehensive income 37 0
Total stockholders' equity 20,009 26,104
Total liabilities and stockholders' equity $ 30,474 $ 35,241