Warrants Liability [Text Block] | 4. Liability Attributable to Warrants On January 7, 2014, we entered into a securities purchase agreement (the “SPA”) with a limited number of institutional investors, pursuant to which we issued and sold for cash an aggregate 11,299,999 shares of our common stock at a purchase price of $0.30 per share (See Note 11) (the “2014 Transaction”). We also issued warrants to the investors for no additional consideration to purchase an aggregate 5,650,001 shares of our common stock at an exercise price of $0.40 per share from January 7, 2014 through January 7, 2019. Under certain conditions of the SPA that were to expire no later than January 7, 2015, we could have been required to issue a variable number of additional warrants to the investors at a below-market value exercise price. Accordingly, we concluded that the warrants issued to the investors were not indexed to our common stock; therefore, the fair value of these warrants was recorded as a liability of $1,356,000 on January 7, 2014 on our Balance Sheet. Since these conditions did not occur as of January 7, 2015, we have reclassified the warrant from liability to equity. Using a binomial pricing model, we calculated the fair value of the warrants issued to the investors on January 7, 2015 to be $407,300. We used the following assumptions in the binomial pricing model to derive the fair value: estimated volatility 113%; annualized forfeiture rate 0%; expected term 4.1 years; estimated exercise factor 3.5; risk free interest rate 1.20; and dividends 0. Changes in fair value of the warrants liability are recognized in other income (expense), except for changes in the fair value of the warrants issued to ipCapital Group, Inc. (“ipCapital”), which are recognized as a component of general and administrative expense in the condensed consolidated statement of operations. We used the exercise price of the warrants, as well as the fair market value of our common stock, to determine the fair value of our warrants. The exercise price for warrants issued in conjunction with the 2011 Transaction, including those issued to the placement agent, was either $0.20 or $0.26 per share, and was $0.26 per share for the warrants issued to ipCapital. The fair market value of our common stock was $0.10 and $0.12 per share as of June 30, 2015 and 2014, respectively. We used a binomial pricing model to determine the fair value of our warrants liability as of June 30, 2015 and December 31, 2014, the balance sheet dates, using the following assumptions: Estimated Volatility Annualized Forfeiture Rate Expected Term (Years) Estimated Exercise Factor Risk-Free Interest Rate Dividends 2011 Transaction June 30, 2015 110 % — 1.19 3.5 0.37 % — December 31, 2014 104 % — 1.69 3.5 0.56 % — 2014 Transaction June 30, 2015 — — — — — — December 31, 2014 114 % — 4.08 3.5 1.35 % — ipCapital June 30, 2015 111 % — 1.30 4.0 0.43 % — December 31, 2014 105 % — 1.81 4.0 0.61 % — The following table is a reconciliation of the warrants liability measured at fair value using significant unobservable inputs (Level 3) for the six months ended June 30, 2015: Warrants liability – December 31, 2014 fair value $ 647,300 Change in fair value of warrant liability recorded in other income (129,300 ) Change in fair value of warrant liability recorded in general and administrative expense (14,300 ) Reclassification of 2014 PIPE Warrant to Equity (407,300 ) Warrants liability – June 30, 2015 fair value $ 96,400 The following tables reconcile the total number of warrants outstanding for the periods indicated: For the Three-Month Period Ended June 30, 2015 Beginning Outstanding Issued Exercised Cancelled / Forfeited Ending Outstanding 2011 Transaction 10,302,500 — — — 10,302,500 2014 Transaction 5,650,001 — — — 5,650,001 Exercise Agreement 4,500,000 — — — 4,500,000 ipCapital 400,000 — — — 400,000 Consultant Warrant (1) 169,273 — — — 169,273 Offer to Exercise 152,500 — — — 152,500 21,174,274 — — — 21,174,274 For the Three-Month Period Ended June 30, 2014 Beginning Outstanding Issued Exercised Cancelled / Forfeited Ending Outstanding 2011 Transaction 10,302,500 — — — 10,302,500 2014 Transaction 5,650,001 — — — 5,650,001 ipCapital 400,000 — — — 400,000 Exercise Agreement 4,500,000 — — — 4,500,000 Consultant Warrant (1) 312,500 — — (143,227 ) 169,273 Offer to Exercise 152,500 — — — 152,500 21,317,501 — — (143,227 ) 21,174,274 For the Six-Month Period Ended June 30, 2015 Beginning Outstanding Issued Exercised Cancelled / Forfeited Ending Outstanding 2011 Transaction 10,302,500 — — — 10,302,500 2014 Transaction 5,650,001 — — — 5,650,001 Exercise Agreement 4,500,000 — — — 4,500,000 ipCapital 400,000 — — — 400,000 Consultant Warrant (1) 169,273 — — — 169,273 Offer to Exercise 152,500 — — — 152,500 21,174,274 — — — 21,174,274 For the Six-Month Period Ended June 30, 2014 Beginning Outstanding Issued Exercised Cancelled / Forfeited Ending Outstanding 2011 Transaction 11,302,500 — (1,000,000 ) — 10,302,500 2014 Transaction — 5,650,001 — — 5,650,001 Exercise Agreement 4,500,000 — — — 4,500,000 ipCapital 400,000 — — — 400,000 Consultant Warrant (1) 312,500 — — (143,227 ) 169,273 Offer to Exercise 152,500 — — — 152,500 16,667,500 5,650,001 (1,000,000 ) (143,227 ) 21,174,274 (1) Effective April 11, 2014, we cancelled our consulting agreement with a former investor relations firm. Under the terms of the agreement, 169,273 of the warrants that had been issued to such firm had vested as of the effective cancellation date. |