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Reconciliation of Financial Instruments Recognized at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 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, 2013	$ 6,968us-gaap_DerivativeLiabilities
Fair value of embedded conversion derivative liabilities at issuance	433	0
Gain on fair value adjustments to embedded conversion derivative liability	(684)
Reductions in fair value due to conversion of convertible debentures into common stock	(6,200)
Balance of embedded conversion derivative liability at June 30, 2014	$ 517us-gaap_DerivativeLiabilities

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 liabilities not subject to a master netting arrangement and not elected to be offset.

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