a.    Stock Warrants: At December 31, 2016, there are 11.3 million warrants outstanding to purchase our common stock. The warrants are exercisable at prices ranging from $0.01 to $3.04 per share with a weighted average exercise price per share of $0.33. See Note 24(d).

The following table summarizes information about our outstanding warrants at December 31, 2016:

* Weighted average exercise price.

In addition, at December 31, 2016, there are 300 warrants outstanding to purchase MT Common Stock. The warrants are exercisable at $2,000 per share.

In March 2014, in connection with the Oxford Loan Agreement, the Company issued Series KK Warrants to purchase an aggregate of 391,032 shares of our common stock at an exercise price of $1.918 per share, expiring in March 2021.

In November 2014, an outside investor exchanged their Series JJ warrants for 3,843,223 shares of our common stock in accordance with the terms of the Series JJ warrant agreement. As a result of the exchange of the Series JJ warrants, we reclassified $7.7 million in derivative liabilities related to those warrants to additional paid-in capital.

In July 2015, we extended the expiration date of our outstanding Series BB warrants by three years to July 2018. The modification of the Series BB warrant expiry resulted in recording a non-cash selling, general and administrative expense of approximately $150,000 during the third quarter of 2015.

In September 2015, we issued four-year Series MM warrants to purchase 150,000 shares of our common stock at an exercise price of $2.50 per share pursuant to an advisory services agreement with Chardan Capital Markets, LLC (“Chardan”). In October 2015, we issued additional four-year Series MM warrants to purchase 150,000 shares of our common stock at an exercise price of $2.50 per share pursuant to the advisory services agreement with Chardan. The fair value of the warrants issued to Chardan of $256,000 was recorded as a non-cash selling, general and administrative expense during the third quarter of 2015.

In October 2015, 5,000,000 Series LL Warrants were exercised on a cashless basis in exchange for the issuance of 4,977,679 shares of our common stock.

b. Common Stock Reserved: As of December 31, 2016, we have reserved 18,641,776 shares of authorized common stock for the exercise of all outstanding stock options and warrants, and upon the conversion of convertible debt and convertible preferred stock.