Joint Development Agreement with CO2 Solutions	12 Months Ended
Dec. 31, 2014
Joint Development Agreement [Abstract]
Joint Development Agreement with CO2 Solutions	Joint Development Agreement with CO2 Solutions On December 15, 2009, we entered into an exclusive joint development agreement with CO₂ Solutions, a company based in Quebec City, Quebec, Canada, whose shares are publicly traded in Canada on TSX Venture Exchange. The joint development agreement expired in January 2011. In January 2011, we extended our joint development agreement with CO₂ Solutions on essentially the same terms as the original agreement. This exclusive arrangement expired in February 2013 and has not been extended. Under the agreement, we obtained a research license to CO₂ Solutions’ intellectual property and agreed to conduct research and development activities jointly with CO₂ Solutions with the goal of advancing the development of carbon management technology. We also purchased 10,000,000 common shares (approximately 16.6% of the total common shares outstanding at the time of investment) of CO₂ Solutions in a private placement subject to a four-month statutory resale restriction. This restriction expired on April 15, 2010. We concluded that we did not have the ability to exercise significant influence over CO₂ Solutions’ operating and financial policies through December 31, 2014. Our investment in CO₂ Solutions is classified as available for sale and is recorded at its fair value. During the year ended December 31, 2012, we recorded an impairment charge of $0.8 million, as the decline in the fair value of the investment was deemed to be other-than-temporary. No impairment charges were recorded during the years ended December 31, 2014 and 2013.

Joint Development Agreement with CO2 Solutions

On December 15, 2009, we entered into an exclusive joint development agreement with CO₂ Solutions, a company based in Quebec City, Quebec, Canada, whose shares are publicly traded in Canada on TSX Venture Exchange. The joint development agreement expired in January 2011. In January 2011, we extended our joint development agreement with CO₂ Solutions on essentially the same terms as the original agreement. This exclusive arrangement expired in February 2013 and has not been extended.

Under the agreement, we obtained a research license to CO₂ Solutions’ intellectual property and agreed to conduct research and development activities jointly with CO₂ Solutions with the goal of advancing the development of carbon management technology. We also purchased 10,000,000 common shares (approximately 16.6% of the total common shares outstanding at the time of investment) of CO₂ Solutions in a private placement subject to a four-month statutory resale restriction. This restriction expired on April 15, 2010. We concluded that we did not have the ability to exercise significant influence over CO₂ Solutions’ operating and financial policies through December 31, 2014.

Our investment in CO₂ Solutions is classified as available for sale and is recorded at its fair value. During the year ended December 31, 2012, we recorded an impairment charge of $0.8 million, as the decline in the fair value of the investment was deemed to be other-than-temporary. No impairment charges were recorded during the years ended December 31, 2014 and 2013.