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Capital Stock (Details) (USD $) | 12 Months Ended |  | 1 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 1 Months Ended
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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 |  |  |  |  |  |  |

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- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 32 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph d -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4, 6 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 + Details
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