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Other Income (Expense), Net - Components of Other Income (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Income and Expenses [Abstract]
Interest income	$ 80us-gaap_InvestmentIncomeInterest	$ 97us-gaap_InvestmentIncomeInterest	$ 136us-gaap_InvestmentIncomeInterest
Foreign currency losses, net	(196)us-gaap_ForeignCurrencyTransactionGainLossUnrealized	(94)us-gaap_ForeignCurrencyTransactionGainLossUnrealized	(46)us-gaap_ForeignCurrencyTransactionGainLossUnrealized
Gain on disposal of equipment	22us-gaap_GainLossOnSaleOfPropertyPlantEquipment	26us-gaap_GainLossOnSaleOfPropertyPlantEquipment	33us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Credit gains (losses) on available for sale securities	311us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1	(78)us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1	(9)us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1
Other	51us-gaap_OtherNonoperatingIncome	51us-gaap_OtherNonoperatingIncome	80us-gaap_OtherNonoperatingIncome
Total other income (expense), net	$ 268us-gaap_NonoperatingIncomeExpense	$ 2us-gaap_NonoperatingIncomeExpense	$ 194us-gaap_NonoperatingIncomeExpense

X

- Definition

Amount of unrealized gain (loss) on investments in debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (d)

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- Definition

Amount before tax of foreign currency transaction unrealized gain (loss) recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



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-Name Accounting Standards Codification

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-Section 45

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- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Section 45

-Paragraph 28

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- Definition

Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Article 5



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The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

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-Publisher FASB

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The aggregate amount of other income amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) profits on securities (net of losses), and (d) miscellaneous other income items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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