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Warrants (Tables)

12 Months Ended

Dec. 31, 2017

Proceeds From Issuance Of Preferred Stock Preference Stock And Warrants [Abstract]

The following table shows the common stock warrants outstanding as of December 31, 2017 and 2016:

Shares of Common Stock Underlying Warrants		Exercise Price/Share			Expiration Date
	28,713			23.51			2024
	144,772		14.00			2022
	931			6.45			2019
	45,307			2.76			2026

- 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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