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Change in Fair Value of Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended									6 Months Ended							6 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Derivative Instrument	Jun. 30, 2012 Derivative Instrument	Jun. 30, 2013 Warrant	Jun. 30, 2012 Warrant	Jun. 30, 2012 Warrants Issued October 2009	Jun. 30, 2013 Warrants Issued October 2009	Dec. 31, 2012 Warrants Issued October 2009	Jun. 30, 2013 Warrants Issued October 2009 Derivative Instrument	Jun. 30, 2012 Warrants Issued October 2009 Derivative Instrument	Jun. 30, 2013 Warrants Issued October 2009 Warrant	Jun. 30, 2012 Warrants Issued October 2009 Warrant	Jun. 03, 2013 Embedded Derivative Financial Instruments	Jun. 30, 2013 Embedded Derivative Financial Instruments	Dec. 31, 2012 Embedded Derivative Financial Instruments	Jun. 30, 2013 Embedded Derivative Financial Instruments Derivative Instrument	Jun. 30, 2013 Foreign Exchange Contract	Jun. 30, 2013 Foreign Exchange Contract Derivative Instrument
Derivatives, Fair Value [Line Items]
Beginning Balance			$ 69,431	$ 123,125					$ 123,125	$ 36,028	$ 54,854						$ 8,600	$ 14,577		$ 887
(Gain) loss on change in fair value of derivative liabilities	18,841	(18,930)	22,461	(85,139)	(22,461)	85,139						(17,371)	85,139			6,000			(5,977)		887
Compensation income (expense) for change in fair value of warrants issued to former employees							(1,455)	4,232						(1,455)	4,232
Transfers to equity				(92,282)					(92,282)
Ending Balance	$ 45,515	$ 120,214	$ 45,515	$ 120,214					$ 120,214	$ 36,028	$ 54,854						$ 8,600	$ 14,577		$ 887

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- Definition

Derivative Liabilities Transferred to Stockholders' Equity

+ References

No definition available.

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

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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

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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.

+ References

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

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