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Document And Entity Information (USD $)
 12 Months Ended
Dec. 31, 2014
Feb. 26, 2015
Jun. 30, 2014
Document Information [Line Items]      
Entity Registrant Name CLEARSIGN COMBUSTION CORP    
Entity Central Index Key 0001434524    
Current Fiscal Year End Date --12-31    
Entity Filer Category Smaller Reporting Company    
Trading Symbol CLIR    
Entity Common Stock, Shares Outstanding   12,671,476dei_EntityCommonStockSharesOutstanding  
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2014    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2014    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 70,900,000dei_EntityPublicFloat