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Changes in Fair Value of Warrant Liability (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Revaluation of warrants	$ (15,924)	$ (46,715)
Warrants
Derivatives, Fair Value [Line Items]
Balance, beginning of the year	58,639	28,815
Issuance of warrants
Revaluation of warrants	15,924	46,715
Exercise of warrants	(74,563)	(16,891)
Balance, end of year		$ 58,639

Amount of increase in additional paid in capital (APIC) resulting from the issuance of warrants. Includes allocation of proceeds of debt securities issued with detachable stock purchase warrants.

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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.

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