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Change in Fair Value of Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended									9 Months Ended				3 Months Ended	9 Months Ended			9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Derivative Instrument	Sep. 30, 2012 Derivative Instrument	Sep. 30, 2013 Warrant	Sep. 30, 2012 Warrant	Sep. 30, 2012 Warrants Issued October 2009	Sep. 30, 2013 Warrants Issued October 2009	Dec. 31, 2012 Warrants Issued October 2009	Sep. 30, 2013 Warrants Issued October 2009 Derivative Instrument	Sep. 30, 2012 Warrants Issued October 2009 Derivative Instrument	Sep. 30, 2013 Warrants Issued October 2009 Warrant	Sep. 30, 2012 Warrants Issued October 2009 Warrant	Sep. 30, 2013 Embedded Derivative Financial Instruments	Sep. 30, 2013 Embedded Derivative Financial Instruments	Sep. 30, 2013 Embedded Derivative Financial Instruments Derivative Instrument	Sep. 30, 2013 Foreign Exchange Contract	Sep. 30, 2013 Foreign Exchange Contract Derivative Instrument
Derivatives, Fair Value [Line Items]
Beginning Balance			$ 69,431	$ 123,125					$ 123,125	$ 39,598	$ 54,854						$ 14,577		$ 395
(Gain) loss on change in fair value of derivative liabilities	1,402	(16,454)	(21,059)	68,686	(21,059)	68,686						(14,077)	68,686			(1,400)	(7,400)	(7,377)		395
Compensation expense (income) for change in fair value of warrants issued to former employees							(1,179)	3,037						(1,179)	3,037
Transfers to equity				(103,885)					(103,885)
Ending Balance	$ 47,193	$ 90,963	$ 47,193	$ 90,963					$ 90,963	$ 39,598	$ 54,854					$ 7,200	$ 7,200		$ 395

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.

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