Warrants (Tables)

6 Months Ended

Jun. 30, 2015

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

Security	Number of Preferred and Common Warrants at December 31, 2014		Number of Common Warrants at June 30, 2015		Exercise Price/Share		Expiration Date
Series C-1 redeemable convertible preferred stock warrants		1,290,350		—	$	37.16	2016-2017
Series C-2 redeemable convertible preferred stock warrants		157,912		1,488		24.23	2015
Series D redeemable convertible preferred stock warrants		769,059		—		1.07	2020
Series E redeemable convertible preferred stock warrants		2,512,562		23,396		23.51	2024
Convertible note warrants		—		144,772		14.00	2022
Common stock warrants		931		931		6.45	2019

- 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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