Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2018

Summary of Option Activity under 2018 Plan, 2013 Plan and 2010 Plan

A summary of option activity under the 2018 Plan, 2013 Plan, and 2010 Plan for the year ended December 31, 2018 is as follows:

	Number of Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value
Options outstanding at December 31, 2017		463,600		$	11.23		9.5
Granted		377,500		$	21.65
Exercised		(34,375	)	$	2.55			$	603,969
Cancelled/forfeited		(25,000	)	$	20.21
Options outstanding at December 31, 2018		781,725		$	16.34		9.0	$	4,109,547
Options exercisable at December 31, 2018		217,222		$	8.37		8.1	$	2,552,337

Summary of Warrant Activity

A summary of warrant activity for the year ended December 31, 2018, is presented below:

	Number of Shares			Weighted Average Exercise Price		Weighted Average Remaining Contract Term (# years)		Intrinsic Value
Outstanding and exercisable at December 31, 2017		317,630		$	123.61		0.29		—
Expired		(317,630	)	$	—		—		—
Outstanding and exercisable at December 31, 2018		—		$	—		—		—

- 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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