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Fair Value - Summary of Assets Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Assets measured at fair value
Cash and cash equivalents	$ 28,376	$ 34,766	$ 4,160	$ 10,014
Restricted cash	250	250
Total Assets measured at fair value	28,626us-gaap_AssetsFairValueDisclosure	35,016us-gaap_AssetsFairValueDisclosure
Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value
Cash and cash equivalents	28,376	34,766
Restricted cash	250	250
Total Assets measured at fair value	$ 28,626	$ 35,016

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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