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Change in Fair Value of Warrant Derivative Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Oct. 31, 2009
Derivatives, Fair Value [Line Items]
Beginning Balance	$ 123,125
Loss (gain) on change in fair value of derivative liability	35,344	22,669	205,153
Compensation expense for change in fair value of warrants issued to former employees	(18,075)	(9,294)	(5,207)
Ending Balance	54,854	123,125
Warrants Issued October 2009
Derivatives, Fair Value [Line Items]
Beginning Balance	123,125	230,069	41,520	48,300
Initial measurement-December 2012 financing
Loss (gain) on change in fair value of derivative liability	35,367	22,669
Compensation expense for change in fair value of warrants issued to former employees	(200)	100
Transfers to equity	(103,885)	(129,517)	(22,317)
Ending Balance	54,854	123,125	230,069	48,300
Warrants Issued October 2009 | Derivative Instrument
Derivatives, Fair Value [Line Items]
Loss (gain) on change in fair value of derivative liability	35,367	22,669	205,153
Warrants Issued October 2009 | Warrant
Derivatives, Fair Value [Line Items]
Compensation expense for change in fair value of warrants issued to former employees	$ 247	$ (96)	$ 5,713

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Derivative Liabilities Transferred to Stockholders' Equity

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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.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.



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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.



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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.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-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.



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