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Statements of Cash Flows (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash flows from operating activities:    
Net loss $ (1,583,000)us-gaap_NetIncomeLoss $ (1,646,000)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:    
Common stock issued for services 25,000clir_CommonStockIssuedForServices 55,000clir_CommonStockIssuedForServices
Share based payments 116,000us-gaap_ShareBasedCompensation 81,000us-gaap_ShareBasedCompensation
Depreciation and amortization 56,000us-gaap_DepreciationDepletionAndAmortization 58,000us-gaap_DepreciationDepletionAndAmortization
Abandonment of capitalized patents 0us-gaap_ExplorationAbandonmentAndImpairmentExpense 8,000us-gaap_ExplorationAbandonmentAndImpairmentExpense
Deferred rent (3,000)clir_DeferredRent 9,000clir_DeferredRent
Change in operating assets and liabilities:    
Prepaid expenses (2,000)us-gaap_IncreaseDecreaseInPrepaidExpense 76,000us-gaap_IncreaseDecreaseInPrepaidExpense
Accounts payable (53,000)us-gaap_IncreaseDecreaseInAccountsPayable (13,000)us-gaap_IncreaseDecreaseInAccountsPayable
Accrued compensation (294,000)us-gaap_IncreaseDecreaseInAccruedLiabilities (264,000)us-gaap_IncreaseDecreaseInAccruedLiabilities
Net cash used in operating activities (1,738,000)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (1,636,000)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:    
Acquisition of fixed assets (17,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (17,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Disbursements for patents and other intangible assets (335,000)us-gaap_PaymentsToAcquireIntangibleAssets (328,000)us-gaap_PaymentsToAcquireIntangibleAssets
Net cash used in investing activities (352,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (345,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:    
Proceeds from issuance of common stock for cash, net of offering costs 16,279,000us-gaap_ProceedsFromIssuanceOrSaleOfEquity 5,796,000us-gaap_ProceedsFromIssuanceOrSaleOfEquity
Proceeds from exercise of stock options 253,000us-gaap_ProceedsFromStockOptionsExercised 0us-gaap_ProceedsFromStockOptionsExercised
Reduction in long term accrued compensation and taxes (97,000)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation 0us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Net cash provided by financing activities 16,435,000us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 5,796,000us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net increase in cash and cash equivalents 14,345,000us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 3,815,000us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period 1,845,000us-gaap_CashAndCashEquivalentsAtCarryingValue 2,688,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period $ 16,190,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 6,503,000us-gaap_CashAndCashEquivalentsAtCarryingValue