Preferred Stock Warrants (Tables)

9 Months Ended

Sep. 30, 2018

Summary of Outstanding Redeemable Convertible Preferred Stock Warrants and Corresponding Exercise Price

The following table summarizes the outstanding redeemable convertible preferred stock warrants and the corresponding exercise price as of September 30, 2018 and December 31, 2017:

	Number of Shares Outstanding
	September 30,		December 31,
	2018		2017		Exercise Price		Expiration Date
Series AA warrants		—		1,506	$	13.28	March 7, 2018
2009 Series B warrants		25,884		25,884		9.659	December 22, 2019
2014 Series B warrants		104,856		104,856		0.12	May 14, 2021
Convertible debt Series C-1 warrants		304,397		304,397		0.12	January 17, 2024
Term loan Series C-1 warrants		49,713		49,713		9.659	October 18, 2027
2018 Series C-1 warrants		223,634		—		0.12	August 25, 2025
		708,484		486,356

- 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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