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Fair Value - Summary of Assets Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assets measured at fair value
Cash and cash equivalents	$ 34,766	$ 10,014	$ 8,896
Restricted cash	250	375
Short term investments		6,191us-gaap_InvestmentsFairValueDisclosure
Total	35,016us-gaap_AssetsFairValueDisclosure	16,580us-gaap_AssetsFairValueDisclosure
Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value
Cash and cash equivalents	34,766	10,014
Restricted cash	250	375
Total	35,016	10,389
Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value
Short term investments		6,191
Total		$ 6,191

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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