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Change in Fair Value of Warrant Derivative Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended									3 Months Ended							3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Derivative Instrument	Mar. 31, 2012 Derivative Instrument	Mar. 31, 2013 Warrant	Mar. 31, 2012 Warrant	Mar. 31, 2012 Warrants Issued October 2009	Mar. 31, 2013 Warrants Issued October 2009	Dec. 31, 2012 Warrants Issued October 2009	Mar. 31, 2013 Warrants Issued October 2009 Derivative Instrument	Mar. 31, 2012 Warrants Issued October 2009 Derivative Instrument	Mar. 31, 2013 Warrants Issued October 2009 Warrant	Mar. 31, 2012 Warrants Issued October 2009 Warrant	Mar. 31, 2013 Embedded Derivative Financial Instruments	Mar. 31, 2013 Embedded Derivative Financial Instruments Derivative Instrument	Mar. 31, 2013 Foreign Exchange Contract	Mar. 31, 2013 Foreign Exchange Contract Derivative Instrument
Derivatives, Fair Value [Line Items]
Beginning Balance	$ 69,430	$ 123,125					$ 123,125	$ 49,011	$ 54,854					$ 14,576		$ 748
(Gain) loss on change in fair value of derivative liabilities	3,620	(66,209)	(3,620)	66,209						(5,392)	66,209			1,000	1,024		748
Compensation expense for change in fair value of warrants issued to former employees	(4,874)	(3,874)			(451)	2,374						(451)	2,374
Transfers to equity		(321)					(321)
Ending Balance	$ 65,359	$ 191,387					$ 191,387	$ 49,011	$ 54,854					$ 15,600		$ 748

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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