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Summary of Warrant Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended	0 Months Ended
	Dec. 31, 2013	Jun. 03, 2013 First Issuance	Nov. 15, 2013 Second Issuance
Class of Warrant or Right [Line Items]
Value of warrants issued	$ 17,597	$ 4,392	$ 13,205
Changes in fair value, net	(2,026)	(175)	(1,851)
Value of warrants exercised	(500)	(500)
Value of warrants at December 31, 2013	$ 15,071	$ 3,717	$ 11,354
Number of warrants outstanding	6,670,103	1,655,000	5,015,000

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, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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