Warrants (Tables)

12 Months Ended

Dec. 31, 2018

Other Liabilities Disclosure [Abstract]

Stock purchase warrant activity is as follows:



	Common Stock Warrants				Preferred Stock Warrants
	Number		Weighted Average Exercise Price		Number		Weighted Average Exercise Price
Outstanding at December 31, 2016	7,031		$	0.57	25,779		$	6.21
Warrants acquired in Merger	13,534		$	80.70	—		$	—
Preferred stock warrants converted into Common Stock warrants	25,779		$	6.21	(25,779	)	$	6.21
Granted	24,097		$	7.15	—		$	—
Exercised	(21,092	)	$	3.04	—		$	—
Outstanding at December 31, 2017	49,349		$	27.65	—		$	—
Activity	—		$	—	—		$	—
Outstanding at December 31, 2018	49,349		$	27.65	—		$	—

A summary of outstanding Common Stock purchase warrants as of December 31, 2018 is as follows:



Number of Underlying Shares	Exercise Price	Expiration Date
13,534	$80.70	2019 & 2020
11,718	$8.53	2025
24,097	$7.15	2024
49,349

- 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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