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Convertible Notes, Long-Term Debt and Credit Facility (Additional Disclosures) (Details) (USD $) | 0 Months Ended | 1 Months Ended | 12 Months Ended |  | 0 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended
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Jan. 22, 2013 | Jun. 30, 2012 | Nov. 30, 2011 | Dec. 31, 2013 | Dec. 31, 2012 | Feb. 11, 2008 | Mar. 31, 2010 Term loan [Member] | Jun. 30, 2011 Term loan [Member] | Dec. 31, 2013 Term loan [Member] | Mar. 31, 2010 Senior credit facility [Member] | Dec. 31, 2013 Exchange Agreement [Member]
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commitment Fee Percentage |  |  |  |  |  |  |  |  | 50.00% |  | 50.00%
Share lending agreement, number of common stock shares loaned |  |  |  | 3,800,000 |  | 3,800,000 |  |  |  |  |
Own share lending arrangement nominal loan fee per share |  |  |  |  |  | $ 0.0001 |  |  |  |  |
Share lending agreement, fair value |  |  |  |  |  | $ 500,000 |  |  |  |  |
Return of borrowed shares under share-based, shares | 2,439,558 | 659,340 | 701,102 | 2,439,558 | 659,340 |  |  |  |  |  |
Face amount |  |  |  |  |  |  | 40,000,000.0 |  |  |  |
Maturity date |  |  |  |  |  |  | Nov. 01, 2012 |  |  |  |
Periodic prinicpal payments |  |  |  |  |  |  | 1,000,000 |  |  |  |
Term loan, annual interest rate |  |  |  |  |  |  | 12.50% |  |  |  |
Senior note commitment fee |  |  |  |  |  |  |  |  |  | 7,300,000 |
Loss on the extinguishment of debt |  |  |  |  |  |  |  | $ 2,100,000 |  |  |

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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 difference between the reacquisition price and the net carrying amount of the extinguished debt recognized currently as a component of income in the period of extinguishment, net of tax. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 26 -Paragraph 20 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6401765&loc=d3e13305-112630 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 145 -Paragraph A5 -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 Amount of the required periodic payment applied to principal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The number of shares issued in connection with an own-share lending arrangement entered into by the entity, in contemplation of a convertible debt offering or other financing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 2A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=7656903&loc=SL6757479-112611 + Details
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