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Stockholders' Equity-Common and Preferred Shares - Summary of Company's Derivative Liability Activity (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative liability outstanding at beginning of period	$ 6
Net decrease in fair value of all warrants	(6)
Derivative liability outstanding at end of period

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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