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Derivative Warrant Liabilities | 12 Months Ended
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Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Derivative Warrant Liabilities | NOTE 7 - DERIVATIVE WARRANT LIABILITIES The remaining outstanding warrants and terms as of December 31, 2018 and December 31, 2017 (split-adjusted) are as follows: (*)
Issuance date |  | Outstanding as of December 31, 2017 |  | Outstanding as of December 31, 2018 |  | Exercise Price |  | Exercisable as of December 31, 2018 |  | Exercisable Through
Series A (2013) |  |  | 3,895 |  |  |  | - |  |  | $ | - |  |  |  | - |  |  | October 2018
Series A (2013) |  |  | 183 |  |  |  | 183 |  |  | $ | 2,725 |  |  |  | 183 |  |  | April 2023
Series A (2015) |  |  | 683 |  |  |  | 683 |  |  | $ | 1,363 |  |  |  | 683 |  |  | April 2020
Series A (2016) (a) |  |  | 625 |  |  |  | - |  |  | $ | - |  |  |  | - |  |  | March 2018
Series B (2016) (a) |  |  | 2,770 |  |  |  | 2,770 |  |  | $ | 40 |  |  |  | 2,770 |  |  | March 2022
| (*) |  | December 31, 2018 and 2017 warrant data represents the number of shares adjusted to retroactively reflect the 1:15 Reverse Split effected on September 4, 2018. Refer to Note 1 for further information.
| a) |  | These warrants contain a full ratchet anti-dilution price protection so that, in most situations upon the issuance of any common stock or securities convertible into common stock at a price below the then-existing exercise price of the outstanding warrants, the warrant exercise price will be reset to the lower common stock sales price. As such anti-dilution price protection does not meet the specific conditions for equity classification, the Company is required to classify the fair value of these warrants as a liability, with changes in fair value to be recorded as income (loss) due to change in fair value of warrant liability. The estimated fair value of the Company’s warrant liability at December 31, 2018 and December 31, 2017, was approximately $8 and $28, respectively.
As quoted prices in active markets for identical or similar warrants are not available, the Company uses directly observable inputs in the valuation of its derivative warrant liabilities (level 3 measurement). The Company uses the Black-Scholes valuation model to estimate fair value of these warrants. In using this model, the Company makes certain assumptions about risk-free interest rates, dividend yields, volatility, expected term of the warrants and other assumptions. Risk-free interest rates are derived from the yield on U.S. Treasury debt securities. Dividend yields are based on our historical dividend payments, which have been zero to date. Volatility is estimated from the historical volatility of our common stock as traded on NASDAQ. The expected term of the warrants is based on the time to expiration of the warrants from the date of measurement. In March 2017, an institutional holder executed a cashless exercise of 51 warrants and 24 shares of common stock were issued in connection therewith. The following table summarizes the changes in the valuation of the derivative warrant liabilities as of December 31, 2018 and December 31, 2017:
|  | Series A (2011) |  |  | Series A (2013) |  |  | Series A (2013) |  |  | Series A (2015) |  |  | Series A (2016) |  |  | Series B (2016) |  |  | Total |
Balances at December 31, 2017 |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | (*) |  |  | $ | 28 |  |  | $ | 28 |
Exercised |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Expired |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (*) |  |  |  | - |  |  |  | (*) |
Changes in fair value |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (20 | ) |  |  | (20 | )
Balances at December 31, 2018 |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | 8 |  |  | $ | 8 |
(*) Less than 1 The following table summarizes the observable inputs used in the valuation of the derivative warrant liabilities as of December 31, 2018 and December 31, 2017 (split-adjusted):
|  | As of December 31, 2018 |  |  | As of December 31, 2017 |
|  |  | Series A (2016) |  |  |  | Series B (2016) |  |  |  | Series A (2016) |  |  |  | Series B (2016) |
Share price |  |  | — |  |  | $ | 1.72 |  |  | $ | 15.10 |  |  | $ | 15.10 |
Exercise price |  |  | — |  |  | $ | 40.00 |  |  | $ | 40.00 |  |  | $ | 40.00 |
Expected volatility |  |  | — |  |  |  | 181.3 | % |  |  | 60 | % |  |  | 119 | %
Risk-free interest |  |  | — |  |  |  | 2.92 | % |  |  | 1.24 | % |  |  | 1.89 | %
Dividend yield |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Expected life of up to (years) |  |  | — |  |  |  | 3.25 |  |  |  | 0.25 |  |  |  | 4.25 |
Activity in such liabilities measured on a recurring basis is as follows:
|  | Derivative Warrant Liabilities |
As of December 31, 2017 |  | $ | 28 |
Revaluation of warrants |  |  | (20 | )
As of December 31, 2018 |  | $ | 8 |
|  | Derivative Warrant Liabilities |
As of December 31, 2016 |  | $ | 313 |
Revaluation of warrants |  |  | (285 | )
Exercise warrants |  |  | (*) |
As of December 31, 2017 |  | $ | 28 |
(*) Less than 1 In accordance with ASC-820-10-50-2(g), the Company has performed a sensitivity analysis of the derivative warrant liabilities of the Company which are classified as level 3 financial instruments. The Company recalculated the value of warrants by applying a +/- 5% changes to the input variables in the Black-Scholes model that vary overtime, namely, the volatility and the risk-free rate. A 5.0% decrease or increase in volatility would not have materially changed the value of the warrants. A 5.0% decrease or increase in the risk-free rate would not have materially changed the value of the warrants; the value of the warrants is not strongly correlated with small changes in interest rates.

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- Definition The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -URI http://asc.fasb.org/topic&trid=2229140 + Details
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