Quarterly report pursuant to Section 13 or 15(d)

Joint Development Agreement with CO2 Solutions (Details)

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Joint Development Agreement with CO2 Solutions (Details) (CO2 Solutions [Member], USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 3 Months Ended 12 Months Ended
Dec. 15, 2009
Mar. 31, 2013
Dec. 31, 2012
CO2 Solutions [Member]
     
Joint Development Agreement with CO2 solutions (Textual) [Abstract]      
Number of shares acquired in joint venture 10,000,000    
Percentage of common shares outstanding at the time of investment 16.60%    
Statutory resale restriction, expiry period 4 months    
Statutory resale restriction, expiry date Apr. 15, 2010    
Expiration period of extended joint development agreement (months)   9 months  
Expiration period of original joint development agreement   2011-01  
Recorded impairment in condensed consolidated statement of operations as sales, general and administrative expenses   $ 0.8 $ 0.8