Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2018

Summary of Outstanding Common Stock Warrants

Outstanding common stock warrants at March 31, 2018 consist of the following:

Issue Date	Expiration Date	Total Warrants		Exercise Price

4/26/2013	4/26/2018		13,865	$	55.90
10/31/2013*	4/30/2019		137,143	$	3.75
2/5/2014*	2/5/2019		265,947	$	3.75
7/24/2014	7/24/2019		1,239,769	$	3.75 - $ 12.25
6/22/2015	6/22/2020		600,000	$	3.75
12/30/2015	12/30/2020		130,089	$	5.65
1/29/2016	1/29/2021		19,812	$	5.30
			2,406,625

*These warrants are classified as liabilities.

- Definition

Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable.

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