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Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Consolidated Statements of Operations and Comprehensive Loss    
Revenues $ 607 $ 0
Cost of Goods and Services Sold 1,059 279
Gross loss (452) (279)
Operating expenses:    
Research and development, net of grants 2,680 2,029
General and administrative 5,013 4,624
Total operating expenses 7,693 6,653
Loss from operations (8,145) (6,932)
Other income:    
Other income 252 44
Interest income 1 2
Net loss (7,892) (6,886)
Net loss attributed to noncontrolling interest 1 2
Net loss attributed to ClearSign Technologies Corporation common stockholders $ (7,891) $ (6,884)
Net loss per share - basic and fully diluted $ (0.25) $ (0.25)
Weighted average number of shares outstanding - basic and fully diluted 31,230,806 27,837,095
Comprehensive loss    
Net loss $ (7,892) $ (6,886)
Change in foreign currency translation 9  
Comprehensive loss $ (7,883) $ (6,886)