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Marketable Securities Securities in unrealized loss position (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 26,156us-gaap_AvailableForSaleSecurities
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	57us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	54us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	55us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	2us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember
Loss Position [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Current	1,601us-gaap_AvailableForSaleSecuritiesCurrent / clro_SecuritieswithUnrealizedGainsorLossesAxis = clro_LossPositionMember
Available-for-sale Securities, Noncurrent	8,033us-gaap_AvailableForSaleSecuritiesNoncurrent / clro_SecuritieswithUnrealizedGainsorLossesAxis = clro_LossPositionMember
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	9,634us-gaap_AvailableForSaleSecurities / clro_SecuritieswithUnrealizedGainsorLossesAxis = clro_LossPositionMember
Loss Position [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Current	1,601us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / clro_SecuritieswithUnrealizedGainsorLossesAxis = clro_LossPositionMember
Available-for-sale Securities, Noncurrent	6,865us-gaap_AvailableForSaleSecuritiesNoncurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / clro_SecuritieswithUnrealizedGainsorLossesAxis = clro_LossPositionMember
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	8,466us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / clro_SecuritieswithUnrealizedGainsorLossesAxis = clro_LossPositionMember
Loss Position [Member] | Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Current	0us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember / clro_SecuritieswithUnrealizedGainsorLossesAxis = clro_LossPositionMember
Available-for-sale Securities, Noncurrent	1,168us-gaap_AvailableForSaleSecuritiesNoncurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember / clro_SecuritieswithUnrealizedGainsorLossesAxis = clro_LossPositionMember
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,168us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember / clro_SecuritieswithUnrealizedGainsorLossesAxis = clro_LossPositionMember
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	11us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / clro_SecuritiesbySecondaryMaturityClassAxis = us-gaap_ShortTermInvestmentsMember
Short-term Investments [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	11us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / clro_SecuritiesbySecondaryMaturityClassAxis = us-gaap_ShortTermInvestmentsMember
Short-term Investments [Member] | Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember / clro_SecuritiesbySecondaryMaturityClassAxis = us-gaap_ShortTermInvestmentsMember
Long-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	46us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / clro_SecuritiesbySecondaryMaturityClassAxis = clro_LongtermInvestmentsMember
Long-term Investments [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	44us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / clro_SecuritiesbySecondaryMaturityClassAxis = clro_LongtermInvestmentsMember
Long-term Investments [Member] | Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	$ 2us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember / clro_SecuritiesbySecondaryMaturityClassAxis = clro_LongtermInvestmentsMember

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

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-Publisher FASB

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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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-Section 25

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Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

+ References

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

-Publisher FASB

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