Warrants (Tables)

6 Months Ended

Jun. 30, 2019

Stockholders' Equity Note [Abstract]

Summary of Warrants Issued and Outstanding

The following table summarizes the warrants issued and outstanding as of June 30, 2019:



	Warrants Outstanding as of December 31, 2018	Warrants Issued	Warrants Exercised	Warrants Expired	Warrants Outstanding as of June 30, 2019	Exercise Price		Expiration Date
		(unaudited)
PIPE Financing - Series B	195,906	—	—	—	195,906	$	31.00	8/19/2021
Hercules - June 2014	1,583	—	—	—	1,583	$	176.80	1/27/2020
Hercules - June 2015	2,035	—	—	—	2,035	$	147.40	6/23/2020
Trinity - September 2018	75,000	—	—	—	75,000	$	3.59	9/25/2025
Total	274,524	—	—	—	274,524

- 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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