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Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended |  |  |  | 12 Months Ended |  |
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Jul. 31, 2009 | Dec. 31, 2008 | Dec. 31, 2011 Warrants Issued October 2009 Year | Dec. 31, 2010 Warrants Issued October 2009 Year | Dec. 31, 2009 Warrants Issued October 2009 | Oct. 31, 2009 Warrants Issued October 2009 Year | Dec. 31, 2009 Warrants Issued June and July 2009 Year | Oct. 31, 2009 Warrants Issued June and July 2009 | Jul. 31, 2009 Warrants Issued June and July 2009 Year | Dec. 31, 2009 Warrants Issued December 2007 Year | Dec. 06, 2009 Warrants Issued December 2007 | Dec. 31, 2008 Warrants Issued December 2007 | Dec. 31, 2007 Warrants Issued December 2007 Year | Dec. 31, 2009 Participation Rights Issued May 2008 | Dec. 31, 2008 Participation Rights Issued May 2008 Year | Mar. 31, 2008 Participation Rights Issued May 2008 Year
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of derivative liability | $ 123,125,000 | $ 230,069,000 | $ 41,520,000 | $ 2,800,000 | $ 1,037,000 | $ 123,125,000 | $ 230,069,000 | $ 41,520,000 | $ 48,300,000 |  | $ 4,300,000 | $ 2,800,000 |  | $ 1,000,000 | $ 533,000 | $ 2,500,000 |  | $ 504,000 | $ 8,200,000
Warrant derivative liability valuation assumptions, risk-free rate |  |  |  |  |  | 0.36% | 1.52% |  | 2.37% | 2.55% |  | 2.35% | 1.32% |  |  | 3.32% |  | 0.04% | 2.24%
Warrant derivative liability valuation assumptions, remaining term |  |  |  |  |  | 2.8 | 3.8 |  | 5.0 | 4.8 |  | 5.0 | 3.0 |  |  | 5.0 |  | 0.2 | 0.6
Warrant derivative liability valuation assumptions, volatility rate |  |  |  |  |  | 118.00% | 117.00% |  | 119.00% | 112.00% |  |  | 131.00% |  |  | 113.00% |  | 131.00% | 90.00%
Decrease in the fair value of the warrant derivative liability |  |  |  |  |  | 22,600,000 | 210,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Fair value of derivative liability transferred to equity | 129,517,000 | 22,317,000 | 5,328,000 |  |  | 129,517,000 | 22,317,000 |  |  | 4,316,000 |  |  | 1,012,000 |  |  |  |  |  |
(Gain) loss on change in fair value of derivative liability | (22,669,000) | (205,153,000) | 5,137,000 |  |  | (22,669,000) | (205,153,000) | 6,625,000 |  | (1,513,000) |  |  | (479,000) |  |  |  | 504,000 |  |
Compensation (income) expense for change in fair value of warrants issued to former employees | $ 9,294,000 | $ 5,207,000 | $ 2,859,000 |  |  | $ (100,000) | $ 5,713,000 |  |  |  |  |  |  |  |  |  |  |  |

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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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