Annual report pursuant to Section 13 and 15(d)

Capital Stock (Details)

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Capital Stock (Details) (USD $)
 12 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2003
Aug. 31, 2010
Azimuth Opportunity Ltd. [Member]
Jul. 31, 2010
Azimuth Opportunity Ltd. [Member]
Aug. 31, 2010
Azimuth Opportunity Ltd. [Member]
2010 Equity Line of Credit [Member]
Dec. 31, 2010
Azimuth Opportunity Ltd. [Member]
2010 Equity Line of Credit [Member]
Jul. 31, 2010
Azimuth Opportunity Ltd. [Member]
2010 Equity Line of Credit [Member]
Apr. 30, 2011
Series B Convertible Preference Shares [Member]
Dec. 31, 2003
Series B Convertible Preference Shares [Member]
Apr. 30, 2011
Common Stock [Member]
Preference Shares Disclosure [Abstract]                        
Preference shares, shares issued (in shares)                     2,959  
Amount of outstanding debt converted                     $ 29,600,000  
Preference shares, liquidation preference (in dollars per share)                     $ 10,000  
Preference shares, liquidation preference       29,600,000                
Preference shares, voting rights                     The holder of the Series B preference shares had no voting rights, except as required under Bermuda law.  
Conversion price (in dollars per share)                     $ 116.25  
Conversion of preference shares, shares converted (in shares)                   2,959    
Conversion of preference shares, shares issued (in shares)                       254,560
Equity Line of Credit [Abstract]                        
Value of shares issuable under equity line of credit agreement                 30,000,000      
Issuance period               12 months        
Number of shares issuable upon execution of agreement (in shares)           111,111            
Shares issued (in shares)             3,421,407          
Proceeds from issuance of common stock $ 77,491,000 $ 15,143,000 $ 70,771,000   $ 14,200,000