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Stockholders' Equity (Details Textual) (USD $)	3 Months Ended	12 Months Ended			1 Months Ended
Stockholders' Equity (Details Textual) (USD $)	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	20,313
Exercise Price Of Warrants	$ 10.00clir_ExercisePriceOfWarrants
Warrants Authorized For Issuance To Acquire Common Stock Value	$ 92,000	$ 92,000
Stock Issued During Period, Value, Issued for Noncash Considerations				125,000
Common Stock, Shares Authorized		62,500,000us-gaap_CommonStockSharesAuthorized
Preferred Stock, Shares Authorized		2,000,000us-gaap_PreferredStockSharesAuthorized
Declining Repurchase Rights Per Share				$ 0.0001clir_DecliningRepurchaseRightsPerShare
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized		601,000
Stock Issued In Registered Direct Offering Price Per Share		$ 8.00
Stock Granted During Period, Value, Share-Based Compensation, Gross		26,000	31,000
Stock Issued During Period Value Exercise Of Warrant			39,000
Proceeds From Issuance Or Sale Of Equity		5,780,000	39,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value		1,788,000
Registered Direct Offering [Member]
Class of Stock [Line Items]
Stock Issued During Period, Value, New Issues	6,500,000
Stock Issued In Registered Direct Offering Price Per Share	$ 8.00
Placement Agent Fees	488,000
Payments for Placement Agent Legal Fees	75,000
Other Cost and Expense, Operating	44,000
Stock Issued During Period, Shares, Registered Direct Offering	812,500
Proceeds From Issuance Or Sale Of Equity	5,800,000
Payment of Financing and Stock Issuance Costs	800,000
Subsequent Event [Member] \| Underwritten Public Offering [Member]
Class of Stock [Line Items]
Gross Proceeds From Public Stock Offering Of Common Stock					17,500,000
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					75,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		7,000	11,250
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 10.26	$ 9.12
Stock Granted During Period, Value, Share-Based Compensation, Gross		72,000	102,000
Common Stock [Member]
Class of Stock [Line Items]
Stock Issued During Period Value Exercise Of Warrant			0
Stock Issued During Period, Shares, Registered Direct Offering		812,500
Warrant [Member]
Class of Stock [Line Items]
Warrants Authorized For Issuance To Acquire Common Stock Shares Number						20,313
Exercise Price Of Warrants						$ 10.00
Warrants Authorized For Issuance To Acquire Common Stock Value						92,000
Equity Incentive Plan [Member]
Class of Stock [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Purchase Price Share Minimum		85.00%
Common Stock, Capital Shares Reserved for Future Issuance		1,077,005
Increase Decrease Of Share Based Compensation Arrangement By Share Based Payment Award Percentage		10.00%
Share-based Compensation Outstanding - Reserved but unissued shares under the Plan		242,764	249,736					480,260
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		141,880	206,390
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 10.26	$ 5.00
Stock Granted During Period, Value, Share-Based Compensation, Gross		150,000	150,000
Share Based Compensation Arrangement By Share Based Payment Award Stock Grants In Period		(14,625)	(30,000)
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
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Subject To Repurchase Rights Decline		7,504
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	307,000
Investment Options, Exercise Price		$ 4.88
Allocated Share-based Compensation Expense		178,000	76,000
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	203,990
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 9.90	$ 4.88
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	2,400
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 8.22	$ 7.33
Legal Fees [Member] \| Registered Direct Offering [Member]
Class of Stock [Line Items]
Stock Issued During Period, Value, Issued for Noncash Considerations	$ 113,000