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Reconciliation of Financial Instruments Recognized at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance of embedded conversion derivative liability as of December 31, 2012	$ 3,981
Gain on fair value adjustments to embedded conversion derivative liability	(123)
Balance of embedded conversion derivative liability at June 30, 2013	$ 3,858

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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