Derivatives and Fair Value [Text Block] | NOTE 10 WARRANTS We account for common stock purchase warrants as either equity instruments or derivative liabilities depending on the specific terms of the warrant. Warrants are accounted for as derivative liabilities if the warrants allow for cash settlement or provide for modification of the warrant exercise price in the event subsequent sales of common stock by the Company are at a lower price per share than the then-current warrant exercise price. As of September 30, 2015, there were no outstanding liability-classified warrants. Weighted- Weighted-average Aggregate average remaining intrinsic Number of exercise contractual term value (in shares price (in years) thousands) Outstanding at December 31, 2014 19,897,928 $ 1.54 Granted 7,694,859 $ 0.75 Exercised (337,169) $ 0.70 Forfeited (1,236,035) $ 3.16 Outstanding at September 30, 2015 26,019,583 $ 1.24 2.3 $ Exercisable at September 30, 2015 26,019,583 $ 1.24 2.3 $ During the nine 337,169 287,000 Weighted- average Number of exercise shares price Expiration Issued to consultants 1,057,667 $ 1.91 December 2015 through May 2020 Issued pursuant to 2011 financings 1,936,785 $ 3.24 January 2016 through April 2016 Issued pursuant to 2012 financings 296,366 $ 3.00 December 2017 Issued pursuant to 2013 financings 4,376,228 $ 1.97 December 2017 through August 2018 Issued pursuant to 2014 financings 10,882,678 $ 0.82 December 2015 through June 2019 Issued pursuant to 2014 financings 7,469,859 $ 0.75 January 2017 through July 2020 26,019,583 During the nine months ended September 30, 2015, in connection with a private placement, we issued an aggregate of 7,469,859 7,182,556 287,303 0.70 0.80 225,000 0.65 0.30 During the nine months ended September 30, 2014, in connection with a registered offering, we issued an aggregate of 10,736,722 10,409,905 326,817 0.85 1.15 483,125 1.15 3,826,792 4,163,961 0.70 December 31, 2016 During the nine months ended September 30, 2014, we issued warrants to consultants to purchase 248,000 1.15 3.00 0.36 Total stock-based compensation expense of approximately $ 67,000 90,000 Nine months ended September 30, 2015 2014 Volatility 72.7 % 52.0 % Expected term (years) 1.7 2.0 Risk-free interest rate 0.6 % 0.5 % Dividend yield 0 % 0 % |