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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2012
Fair Value Measurements [Abstract] |
Liabilities measured at fair value on a recurring basis, fair value hierarchy of valuation techniques |
|  | Fair Value Measurements Using |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
At September 30, 2012: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
None |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
At December 31, 2011: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock warrants (1) |  | $ | — |  |  | $ | — |  |  | $ | 16,622 |  |  | $ | 16,622 |
(1) | The fair value of the common stock warrants was estimated using a Black-Scholes option pricing model. See Note 12 for additional information regarding warrants.
Changes in warrant liability |
|  | Nine Months Ended September 30, 2012 |  |  | Year Ended December 31, 2011 |
Balance, beginning of period |  | $ | 16,622 |  |  | $ | 26,193 |
Fair value adjustments, net |  |  | (2,649 | ) |  |  | (9,571 | )
Reclassification to additional paid-in capital |  |  | (13,973 | ) |  |  | — |
Net transfers in/(out) |  |  | — |  |  |  | — |
Balance, end of period |  | $ | — |  |  | $ | 16,622 |
Carrying value and estimated fair value of convertible notes and long-term debt |
|  | September 30, 2012 |  |  | December 31, 2011 |
|  | Carrying Value |  |  | Fair Value |  |  | Carrying Value |  |  | Fair Value |
Convertible senior notes (2008 Notes) (1) |  | $ | 54,062 |  |  | $ | 56,263 |  |  | $ | 65,604 |  |  | $ | 69,880 |
Convertible senior secured notes (2010 Notes) (1) |  |  | — |  |  |  | — |  |  |  | 34,134 |  |  |  | 37,561 |
Capital lease obligations |  |  | 1,890 |  |  |  | 1,869 |  |  |  | 1,642 |  |  |  | 1,611 |
(1) | The carrying value of the 2008 and 2010 Notes represents the discounted debt component only, while the fair value of the Notes is based on the market value of the respective notes, including convertible equity features.

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- Definition Schedule of carrying value and estimated fair value of convertible notes and long term debt. + References No definition available. + Details
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- Definition Tabular disclosure of liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 6 -Footnote 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 Statement of Financial Accounting Standard (FAS) -Number 157 -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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