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Change in Fair Value of Warrant Derivative Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Derivative [Line Items]
Beginning Balance	$ 123,125
Gain on change in fair value of derivative liability	(66,209)	25,342
Compensation expense for change in fair value of warrants issued to former employees	(3,874)	(1,540)
Ending Balance	191,387
Warrants Issued October 2009
Derivative [Line Items]
Beginning Balance	123,125	230,069
Gain on change in fair value of derivative liability	66,209	(25,342)
Compensation expense for change in fair value of warrants issued to former employees	2,374	(679)
Transfers to equity	(321)	(29,229)
Ending Balance	$ 191,387	$ 174,819

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- Definition

Derivative Liabilities Transferred to Stockholders' Equity

+ References

No definition available.

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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.

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-Publisher FASB

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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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