Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2018

The Company issued warrants as part of its offerings in 2013, 2015, 2016 and 2018 as well as part of its issuance of convertible notes in 2016 and 2018 and an exchange agreement in 2017. A summary of warrant activity is as follows:

	Warrants			Exercise Price per Share	Weighted Average Exercise Price		Weighted Average Remaining Life (Years)
Outstanding at January 1, 2017		78		$281,750 - $19,712,000	$	910,000		5.59
Warrants issued		14,256				2,299
Warrants exercised		(246	)			4,221
Warrants expired		(39	)			845,250
Outstanding at December 31, 2017		14,049		$1,225 - $19,712,000	$	1,569		4.88
Warrants issued in Feb 2018 registered direct offering		1,076,002				9.33
Warrants issued with convertible notes		69,169,756				0.18
Exercised		(4,574,529	)			1.79
Expired		(9	)			19,712,000
Outstanding at December 31, 2018		65,685,269		$0.01 - $10.00	$	0.22		5.75

- 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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