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Stockholders' Equity (Details Textual) (USD $) | 3 Months Ended | 12 Months Ended | 1 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2011 | Feb. 26, 2015 | Mar. 31, 2014 | May 31, 2013 | Dec. 31, 2012
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Warrants Authorized For Issuance To Acquire Common Stock Shares Number | 20,313 clir_WarrantsAuthorizedForIssuanceToAcquireCommonStockSharesNumber | 20,313 clir_WarrantsAuthorizedForIssuanceToAcquireCommonStockSharesNumber |  |  |  |  |  |
Exercise Price Of Warrants | $ 10.00 clir_ExercisePriceOfWarrants |  |  |  |  |  |  |
Warrants Authorized For Issuance To Acquire Common Stock Value | $ 92,000 clir_WarrantsAuthorizedForIssuanceToAcquireCommonStockValue | $ 92,000 clir_WarrantsAuthorizedForIssuanceToAcquireCommonStockValue |  |  |  |  |  |
Stock Issued During Period, Value, Issued for Noncash Considerations |  |  |  | 125,000 us-gaap_StockIssuedDuringPeriodValueIssuedForNoncashConsiderations |  |  |  |
Common Stock, Shares Authorized |  | 62,500,000 us-gaap_CommonStockSharesAuthorized |  |  |  |  |  |
Preferred Stock, Shares Authorized |  | 2,000,000 us-gaap_PreferredStockSharesAuthorized |  |  |  |  |  |
Declining Repurchase Rights Per Share |  |  |  | $ 0.0001 clir_DecliningRepurchaseRightsPerShare |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized |  | 601,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |  |  |  |  |
Stock Issued In Registered Direct Offering Price Per Share |  | $ 8.00 clir_StockIssuedInRegisteredDirectOfferingPricePerShare |  |  |  |  |  |
Stock Granted During Period, Value, Share-Based Compensation, Gross |  | 26,000 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensationGross | 31,000 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensationGross |  |  |  |  |
Stock Issued During Period Value Exercise Of Warrant |  |  | 39,000 clir_StockIssuedDuringPeriodValueExerciseOfWarrant |  |  |  |  |
Proceeds From Issuance Or Sale Of Equity |  | 5,780,000 us-gaap_ProceedsFromIssuanceOrSaleOfEquity | 39,000 us-gaap_ProceedsFromIssuanceOrSaleOfEquity |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value |  | 1,788,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue |  |  |  |  |  |
Registered Direct Offering [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues | 6,500,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_SubsidiarySaleOfStockAxis = clir_RegisteredDirectOfferingMember |  |  |  |  |  |  |
Stock Issued In Registered Direct Offering Price Per Share | $ 8.00 clir_StockIssuedInRegisteredDirectOfferingPricePerShare / us-gaap_SubsidiarySaleOfStockAxis = clir_RegisteredDirectOfferingMember |  |  |  |  |  |  |
Placement Agent Fees | 488,000 clir_PlacementAgentFees / us-gaap_SubsidiarySaleOfStockAxis = clir_RegisteredDirectOfferingMember |  |  |  |  |  |  |
Payments for Placement Agent Legal Fees | 75,000 clir_PaymentsForPlacementAgentLegalFees / us-gaap_SubsidiarySaleOfStockAxis = clir_RegisteredDirectOfferingMember |  |  |  |  |  |  |
Other Cost and Expense, Operating | 44,000 us-gaap_OtherCostAndExpenseOperating / us-gaap_SubsidiarySaleOfStockAxis = clir_RegisteredDirectOfferingMember |  |  |  |  |  |  |
Stock Issued During Period, Shares, Registered Direct Offering | 812,500 clir_StockIssuedDuringPeriodSharesRegisteredDirectOffering / us-gaap_SubsidiarySaleOfStockAxis = clir_RegisteredDirectOfferingMember |  |  |  |  |  |  |
Proceeds From Issuance Or Sale Of Equity | 5,800,000 us-gaap_ProceedsFromIssuanceOrSaleOfEquity / us-gaap_SubsidiarySaleOfStockAxis = clir_RegisteredDirectOfferingMember |  |  |  |  |  |  |
Payment of Financing and Stock Issuance Costs | 800,000 us-gaap_PaymentOfFinancingAndStockIssuanceCosts / us-gaap_SubsidiarySaleOfStockAxis = clir_RegisteredDirectOfferingMember |  |  |  |  |  |  |
Subsequent Event [Member] | Underwritten Public Offering [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Gross Proceeds From Public Stock Offering Of Common Stock |  |  |  |  | 17,500,000 clir_GrossProceedsFromPublicStockOfferingOfCommonstock / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_SubsidiarySaleOfStockAxis = clir_UnderwrittenPublicOfferingMember |  |  |
Employee Stock Option [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 4 years | 4 years |  |  |  |  |
Consultant Plan [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Outstanding - Reserved but unissued shares under the Plan |  | 83,858 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = clir_ConsultantPlanMember |  |  |  |  | 75,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = clir_ConsultantPlanMember |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 7,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis = clir_ConsultantPlanMember | 11,250 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis = clir_ConsultantPlanMember |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  | $ 10.26 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = clir_ConsultantPlanMember | $ 9.12 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = clir_ConsultantPlanMember |  |  |  |  |
Stock Granted During Period, Value, Share-Based Compensation, Gross |  | 72,000 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensationGross / us-gaap_PlanNameAxis = clir_ConsultantPlanMember | 102,000 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensationGross / us-gaap_PlanNameAxis = clir_ConsultantPlanMember |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock Issued During Period Value Exercise Of Warrant |  |  | 0 clir_StockIssuedDuringPeriodValueExerciseOfWarrant / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Stock Issued During Period, Shares, Registered Direct Offering |  | 812,500 clir_StockIssuedDuringPeriodSharesRegisteredDirectOffering / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Warrant [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Warrants Authorized For Issuance To Acquire Common Stock Shares Number |  |  |  |  |  | 20,313 clir_WarrantsAuthorizedForIssuanceToAcquireCommonStockSharesNumber / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember |  |
Exercise Price Of Warrants |  |  |  |  |  | $ 10.00 clir_ExercisePriceOfWarrants / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember |  |
Warrants Authorized For Issuance To Acquire Common Stock Value |  |  |  |  |  | 92,000 clir_WarrantsAuthorizedForIssuanceToAcquireCommonStockValue / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember |  |
Equity Incentive Plan [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Purchase Price Share Minimum |  | 85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent / us-gaap_AwardTypeAxis = clir_EquityIncentivePlanMember |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  | 1,077,005 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_AwardTypeAxis = clir_EquityIncentivePlanMember |  |  |  |  |  |
Increase Decrease Of Share Based Compensation Arrangement By Share Based Payment Award Percentage |  | 10.00%clir_IncreaseDecreaseOfShareBasedCompensationArrangementByShareBasedPaymentAwardPercentage / us-gaap_AwardTypeAxis = clir_EquityIncentivePlanMember |  |  |  |  |  |
Share-based Compensation Outstanding - Reserved but unissued shares under the Plan |  | 242,764 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = clir_EquityIncentivePlanMember | 249,736 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = clir_EquityIncentivePlanMember |  |  |  |  | 480,260 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = clir_EquityIncentivePlanMember
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 141,880 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = clir_EquityIncentivePlanMember | 206,390 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = clir_EquityIncentivePlanMember |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  | $ 10.26 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = clir_EquityIncentivePlanMember | $ 5.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = clir_EquityIncentivePlanMember |  |  |  |  |
Stock Granted During Period, Value, Share-Based Compensation, Gross |  | 150,000 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensationGross / us-gaap_AwardTypeAxis = clir_EquityIncentivePlanMember | 150,000 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensationGross / us-gaap_AwardTypeAxis = clir_EquityIncentivePlanMember |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Stock Grants In Period |  | (14,625)clir_ShareBasedCompensationArrangementByShareBasedPaymentAwardStockGrantsInPeriod / us-gaap_AwardTypeAxis = clir_EquityIncentivePlanMember | (30,000)clir_ShareBasedCompensationArrangementByShareBasedPaymentAwardStockGrantsInPeriod / us-gaap_AwardTypeAxis = clir_EquityIncentivePlanMember |  |  |  |  |
Equity Incentive Plan [Member] | Employee Stock Option [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized |  | 601,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = clir_EquityIncentivePlanMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Subject To Repurchase Rights Decline |  | 7,504 clir_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodSubjectToRepurchaseRightsDecline / us-gaap_AwardTypeAxis = clir_EquityIncentivePlanMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term |  | 10 years | 10 years |  |  |  |  |
Stock Granted During Period, Value, Share-Based Compensation, Gross |  | 799,000 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensationGross / us-gaap_AwardTypeAxis = clir_EquityIncentivePlanMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember | 307,000 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensationGross / us-gaap_AwardTypeAxis = clir_EquityIncentivePlanMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |
Investment Options, Exercise Price |  | $ 4.88 invest_InvestmentOptionsExercisePrice / us-gaap_AwardTypeAxis = clir_EquityIncentivePlanMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |
Allocated Share-based Compensation Expense |  | 178,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = clir_EquityIncentivePlanMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember | 76,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = clir_EquityIncentivePlanMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |
Equity Incentive Plan [Member] | Employee Stock Option One [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 122,880 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = clir_EquityIncentivePlanMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = clir_EmployeeStockOptionOneMember | 203,990 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = clir_EquityIncentivePlanMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = clir_EmployeeStockOptionOneMember |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  | $ 9.90 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = clir_EquityIncentivePlanMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = clir_EmployeeStockOptionOneMember | $ 4.88 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = clir_EquityIncentivePlanMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = clir_EmployeeStockOptionOneMember |  |  |  |  |
Equity Incentive Plan [Member] | Employee Stock Option Two [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 19,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = clir_EquityIncentivePlanMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = clir_EmployeeStockOptionTwoMember | 2,400 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = clir_EquityIncentivePlanMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = clir_EmployeeStockOptionTwoMember |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  | $ 8.22 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = clir_EquityIncentivePlanMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = clir_EmployeeStockOptionTwoMember | $ 7.33 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = clir_EquityIncentivePlanMember / us-gaap_OptionIndexedToIssuersEquityTypeAxis = clir_EmployeeStockOptionTwoMember |  |  |  |  |
Legal Fees [Member] | Registered Direct Offering [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Issued for Noncash Considerations | $ 113,000 us-gaap_StockIssuedDuringPeriodValueIssuedForNoncashConsiderations / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = clir_LegalFeesMember / us-gaap_SubsidiarySaleOfStockAxis = clir_RegisteredDirectOfferingMember |  |  |  |  |  |  |

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