Warrants (Tables)

12 Months Ended

Dec. 31, 2016

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

The following table shows the warrants outstanding by series for the periods presented:

	Shares of Common Stock Underlying Warrants at December 31,
Series of Warrants	2016		2015		Exercise Price/Share ($)		Expiration Date
Series E redeemable convertible preferred stock warrants		28,713		23,396		23.51	2024
Convertible note warrants		144,772		144,772		14.00	2022
Common stock warrants		931		931		6.45	2019
Common stock warrants		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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