NOTE 13. STOCK WARRANTS, OPTIONS AND GRANTS

Stock options. For each of the three months ended March 31, 2017 and 2016, we issued 112,500 stock options to members of our Board of Directors and independent contractors.  

The fair value of all stock options granted for the three months ended March 31, 2017 and 2016 was determined to be $47,635 and $16,348, respectively, using the Black-Scholes option pricing model with the following assumptions:

A summary of stock option activity is as follows:

A summary of unvested stock option activity is as follows:

Warrants.  On August 29, 2016, in connection with the Term Loan Agreement, we issued the lenders the Warrants to purchase 1,965,780 shares of common stock at an initial exercise price of $0.30 per share. The number of shares of common stock issuable upon exercise of the Warrants, and/or the exercise price of such shares, is subject to standard anti-dilution adjustments in the event of stock splits, reorganizations, stock dividends, and similar events. As of the date of the Warrant Agreement, the shares of common stock issuable upon a full exercise of the Warrants would represent 5.0% of the total issued and outstanding shares of our common stock. The lenders were also granted the right, but not the obligation, to purchase up to 5.0% of the total number of new securities that we may, from time to time, sell and issue.

The Warrants expire on August 29, 2022, and may not be exercised prior to the earliest of (a) the fifth anniversary of the Term Loan Agreement, (b) the date on which the obligations described in the Term Loan Agreement are repaid in full, or (c) the date on which the Lender declares all or any portion of the outstanding amount of the Term Loan to be due and payable under the terms of the Term Loan Agreement (collectively, the "Trigger Date"). Exercise of the Warrants requires a sixty (60) day prior written notice, during which time we may exercise our Call Right described below.

The Warrant Agreement includes a call right (the "Call Right") whereby we can purchase the Warrants for a fixed sum of $1,333,333 upon providing the Warrant holders with a thirty (30) day prior written notice. Furthermore, the Warrant Agreement also includes a put right (the "Put Right") whereby the Lenders may require us to purchase from the Lenders all or any portion of the Warrants at a purchase price equal to the lesser of (a) the fair market value of the underlying shares of common stock as of the date of exercise of the Put Right, or (b) $1,333,333. The Put Right may not be exercised prior to the Trigger Date (as defined above), and the Put Right expires on August 29, 2022.  The foregoing summary of the Term Loan Agreement and the Warrant Agreement is qualified in its entirety by reference to the respective agreements, which are found as Exhibits 99.1 and 99.2, respectively, to our Form 8-K filed with the SEC on August 29, 2016.