Quarterly report pursuant to Section 13 or 15(d)

Convertible Notes and Warrants (Details 2)

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Convertible Notes and Warrants (Details 2) (USD $)
0 Months Ended 1 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended
Jan. 16, 2013
Feb. 22, 2013
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Jun. 30, 2013
2011 Warrant Liabilities
Jun. 30, 2013
2011 Warrant Liabilities
Feb. 22, 2013
2011 Warrant Liabilities
Jan. 16, 2013
2011 Warrant Liabilities
Dec. 31, 2012
2011 Warrant Liabilities
Jun. 30, 2012
2011 Warrant Liabilities
Dec. 31, 2011
2011 Warrant Liabilities
Jun. 30, 2013
2012 Warrant Liabilities
Jun. 30, 2013
2012 Warrant Liabilities
Feb. 22, 2013
2012 Warrant Liabilities
Jan. 16, 2013
2012 Warrant Liabilities
Dec. 31, 2012
2012 Warrant Liabilities
Jan. 16, 2013
Third Tranche Warrant Liabilities
Jun. 30, 2013
Third Tranche Warrant Liabilities
Jun. 30, 2013
Third Tranche Warrant Liabilities
Feb. 22, 2013
2011 Convertible Notes
Feb. 22, 2011
2011 Convertible Notes
Feb. 22, 2013
2011 Convertible Notes
Jun. 30, 2013
2011 Convertible Notes
Jun. 30, 2012
2011 Convertible Notes
Jun. 30, 2013
2011 Convertible Notes
Jun. 30, 2013
2011 Convertible Notes
Jun. 30, 2012
2011 Convertible Notes
Jan. 16, 2013
2011 Convertible Notes
Dec. 31, 2012
2011 Convertible Notes
Dec. 31, 2011
2011 Convertible Notes
Feb. 22, 2013
2012 Convertible Notes
Jul. 02, 2012
2012 Convertible Notes
Feb. 22, 2013
2012 Convertible Notes
Jun. 30, 2013
2012 Convertible Notes
Jun. 30, 2013
2012 Convertible Notes
Jan. 16, 2013
2012 Convertible Notes
Dec. 31, 2012
2012 Convertible Notes
Feb. 22, 2013
Third Tranche Convertible Notes
Jan. 16, 2013
Third Tranche Convertible Notes
Jan. 16, 2013
Third Tranche Convertible Notes
Feb. 22, 2013
Third Tranche Convertible Notes
Jun. 30, 2013
Third Tranche Convertible Notes
Jun. 30, 2013
Third Tranche Convertible Notes
Convertible Notes                                                                                                
Impact to other income (expense)     $ 3,177,000 $ (354,000)   $ 1,865,000 $ (3,461,000)                                         $ 2,370,000 $ (3,107,000)   $ 1,718,000 $ (354,000)             $ 620,000 $ 463,000             $ 187,000 $ 101,000
Impact to other income (expense)     6,113,000     2,114,000 (2,400,000)     2,118,000 104,000           979,000 21,000         187,000 101,000                                                
2011 Convertible Notes converted                                                       300,000     300,000                                  
Shares issued on conversion of 2011 Convertible Notes                                                       3,000,000     3,000,000                                  
Reclassification of 2011 Convertible Notes as a component of common stock in stockholders' equity         450,000 450,000                                           450,000   450,000 450,000                                  
Debt discount to be amortized                                                   792,000                     583,000             108,000 108,000      
Write off of debt discount                                                 265,000                     462,000             106,000          
Shares of common stock issued on conversion of warrants                   7,478,226 10,695,967                                                                          
Cashless exercise of warrants           2,003,000       1,159,125 2,002,674                                                                          
Changes in the Convertible Notes and Investor Warrants                                                                                                
Allocation of initial proceeds 250,000                                         108,000       3,208,000                     417,000             142,000 142,000      
Amortization of debt discount   95,000       95,000 132,000                                   38,000   38,000   66,000     132,000       55,000   55,000         2,000     2,000    
Total Liabilities $ 12,592,000 $ 17,490,000 $ 11,064,000 $ 12,920,000 $ 11,064,000 $ 11,064,000 $ 12,920,000 $ 11,898,000 $ 6,927,000 $ 1,809,000 $ 1,809,000 $ 3,916,000 $ 2,000,000 $ 2,000,000 $ 4,000,000 $ 1,600,000 $ 979,000 $ 979,000 $ 1,632,000 $ 1,800,000 $ 1,800,000 $ 300,000     $ 6,070,000   $ 6,070,000 $ 4,380,000 $ 8,920,000 $ 4,380,000 $ 4,380,000 $ 8,920,000 $ 6,510,000 $ 6,510,000 $ 5,327,000 $ 1,516,000   $ 1,516,000 $ 1,180,000 $ 1,180,000 $ 1,588,000 $ 1,588,000 $ 386,000 $ 394,000 $ 394,000 $ 386,000 $ 295,000 $ 295,000
Warrants exercised (in shares)                   20,335,524 29,085,523