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Change in Fair Value of Derivative Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Derivatives, Fair Value [Line Items]
Beginning Balance	$ 17,994	$ 69,430
(Gain) loss on change in fair value of derivative liabilities	(4,393)	(3,620)
Transfers to equity
Ending Balance	13,529	65,359
Warrant
Derivatives, Fair Value [Line Items]
Compensation income for change in fair value of warrants issued to former employees	(72)	(451)
Warrants Issued October 2009
Derivatives, Fair Value [Line Items]
Beginning Balance	6,894	54,854
(Gain) loss on change in fair value of derivative liabilities	(893)	(5,392)
Transfers to equity
Ending Balance	5,929	49,011
Warrants Issued October 2009 \| Warrant
Derivatives, Fair Value [Line Items]
Compensation income for change in fair value of warrants issued to former employees	(72)	(451)
Embedded Derivative Financial Instruments
Derivatives, Fair Value [Line Items]
Beginning Balance	11,100	14,576
(Gain) loss on change in fair value of derivative liabilities	(3,500)	1,024
Transfers to equity
Ending Balance	7,600	15,600
Foreign Exchange Contract
Derivatives, Fair Value [Line Items]
(Gain) loss on change in fair value of derivative liabilities		748
Transfers to equity
Ending Balance		$ 748

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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