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Change in Fair Value of Warrant Derivative Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Jul. 31, 2009 | Dec. 31, 2009 Warrant | Dec. 31, 2009 Financing Warrant | Dec. 31, 2011 Warrant Issued to Employees | Dec. 31, 2010 Warrant Issued to Employees | Dec. 31, 2009 Warrant Issued to Employees | Dec. 31, 2011 Warrants Issued October 2009 | Dec. 31, 2010 Warrants Issued October 2009 | Dec. 31, 2009 Warrants Issued October 2009 | Oct. 31, 2009 Warrants Issued October 2009 | Dec. 31, 2009 Warrants Issued October 2009 Financing Warrant | Dec. 31, 2011 Warrants Issued October 2009 Warrant Issued to Employees | Dec. 31, 2010 Warrants Issued October 2009 Warrant Issued to Employees | Dec. 31, 2009 Warrants Issued October 2009 Warrant Issued to Employees | Dec. 31, 2009 Warrants Issued June and July 2009 | Oct. 31, 2009 Warrants Issued June and July 2009 | Jul. 31, 2009 Warrants Issued June and July 2009 | Dec. 31, 2009 Warrants Issued June and July 2009 Warrant | Dec. 31, 2009 Participation Rights Issued May 2008 | Mar. 31, 2008 Participation Rights Issued May 2008 | Dec. 31, 2009 Warrants Issued December 2007 | Dec. 06, 2009 Warrants Issued December 2007 | Dec. 31, 2007 Warrants Issued December 2007
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance | $ 230,069 | $ 41,520 | $ 1,037 | $ 2,800 |  |  |  |  |  | $ 230,069 | $ 41,520 |  | $ 48,300 |  |  |  |  |  | $ 4,300 | $ 2,800 |  | $ 504 | $ 8,200 | $ 533 | $ 1,000 | $ 2,500
Initial fair value of the warrant derivative liability |  |  | (47,105) |  | 2,803 | 47,105 |  |  | 1,210 |  |  |  |  | 47,105 |  |  | 1,210 |  |  |  | 2,803 |  |  |  |  |
(Gain) loss on change in fair value of derivative liability | 22,669 | 205,153 | (5,137) |  |  |  |  |  |  | 22,669 | 205,153 | (6,625) |  |  |  |  |  | 1,513 |  |  |  | (504) |  | 479 |  |
Compensation (income) expense | (9,294) | (5,207) | (2,859) |  |  |  | (96) | 5,713 | (170) | 100 | (5,713) |  |  |  | (96) | 5,713 | (170) |  |  |  |  |  |  |  |  |
Transfers to equity | (129,517) | (22,317) | (5,328) |  |  |  |  |  |  | (129,517) | (22,317) |  |  |  |  |  |  | (4,316) |  |  |  |  |  | (1,012) |  |
Ending Balance | $ 123,125 | $ 230,069 | $ 41,520 | $ 2,800 |  |  |  |  |  | $ 123,125 | $ 230,069 | $ 41,520 | $ 48,300 |  |  |  |  |  | $ 4,300 | $ 2,800 |  |  | $ 8,200 |  | $ 1,000 | $ 2,500

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- Definition Increase in additional paid in capital due to warrants issued during the period. Includes also the proceeds of debt securities issued with detachable stock purchase warrants that are allocable to the warrants. These warrants qualify for equity classification and provide the holder with a right to purchase stock from the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Warrant -URI http://asc.fasb.org/extlink&oid=6528364 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -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 470 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6923874&loc=d3e4724-112606 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 14 -Paragraph 16 -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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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- Definition Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and which are expected to be extinguished or otherwise disposed of after one year or beyond the normal operating cycle, if longer, net of the effects of master netting arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -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 FASB Staff Position (FSP) -Number FIN39-1 -Paragraph 10A, 10B -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 3 -Section A -Paragraph 7 -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 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 4, 17 -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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13495-108611 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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