Capital Stock

12 Months Ended

Dec. 31, 2014

Equity [Abstract]

Capital Stock

Capital Stock

Warrants

The Company's outstanding warrants are exercisable for common stock at any time during their respective terms. During the year ended December 31, 2012, 6,066 warrants were exercised in a net share transaction to acquire 3,308 shares of the Company's common stock. No warrants were exercised during 2014 or 2013.

At December 31, 2014, the following warrants were issued and outstanding:

Issue Date	Shares Subject to warrants	Exercise Price per Share		Expiration
July 17, 2007	2,384	$	12.45	February 9, 2016
September 28, 2007	72,727	8.25		September 28, 2017

Stockholder Rights Plan

In August 2012, the Board adopted a stockholder rights plan and declared a dividend of one preferred share purchase right for each share of the Company's common stock held by stockholders of record as of September 18, 2012. Each right entitles stockholders, after the rights become exercisable, to purchase one one thousandth of a share of the Company's Series A Junior Participating Preferred Stock, par value $0.0001, at a purchase price of $11.35 per one-thousandth of a share of Series A Junior Participating Preferred Stock. In general, the rights become exercisable when a person or group acquires 15% or more of the Company's common stock or a tender offer for 15% or more of the Company's common stock is announced or commenced. These rights expired in accordance with the terms of the stockholder rights plan on September 2, 2013. Therefore, the shares of the Company's common stock are no longer accompanied by the rights, and the plan is of no further force or effect.