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Equity - Consultant Stock Plan (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended 13 Months Ended
Sep. 30, 2021
Aug. 31, 2020
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Aug. 31, 2021
Aug. 31, 2020
Share-based compensation                          
Fair value of stock options issued for board service       $ 52,000 $ 210,000   $ 122,000 $ 34,000 $ 53,000        
Number of shares vested 15,000 10,000                      
Incentive Stock Options [Member]                          
Share-based compensation                          
Compensation expense     $ 0       13,000     $ 13,000 $ 39,000    
Intrinsic value of options issued $ 119,000   119,000             119,000      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 0   $ 0             $ 0      
Consultant, Two                          
Share-based compensation                          
Shares issued for services ($1.03 per share) (in shares)                   $ 2.33      
Shares issued for services ($2.33 per share)                   $ 35,000      
Shares issued for services (in shares)                       15,000  
Total ClearSign Technologies Corporation Stockholders' Equity                          
Share-based compensation                          
Fair value of stock options issued for board service       52,000 210,000   122,000 34,000 53,000        
Common Stock                          
Share-based compensation                          
Fair value of stock options issued for board service       0 0   $ 0 $ 0 $ 0        
Shares issued for services (in shares)             2,500 2,500 2,500        
Additional Paid-In Capital                          
Share-based compensation                          
Fair value of stock options issued for board service       52,000 210,000   $ 122,000 $ 34,000 $ 53,000        
Accumulated Deficit                          
Share-based compensation                          
Fair value of stock options issued for board service       0 0   0 0 0        
Noncontrolling Interest                          
Share-based compensation                          
Fair value of stock options issued for board service       $ 0 $ 0     $ 0 $ 0        
General and administrative                          
Share-based compensation                          
Compensation expense   $ 10,000               $ 9,000      
General and administrative | Consultant, Two                          
Share-based compensation                          
Shares expensed in period     3,750 3,750 3,750 3,750              
Consultant Plan [Member]                          
Share-based compensation                          
Number of common stock reserved for issuance 297,719   297,719             297,719      
Maximum increase in available number of authorized shares as a percentage of new shares issued                   1.00%      
Shares issued for services, $3.50 (in dollars per share)                   $ 1.03      
Shares Reserved Unissued 211,969   211,969             211,969      
Consultant Plan Expenses     $ 9,000       $ 27,000     $ 3,000 $ 8,000    
Fair value of stock options issued for board service                   $ 10,000      
Consultant Plan [Member] | Consultant, Two                          
Share-based compensation                          
Shares issued for services (in shares)                         10,000
Consultant Plan [Member] | General and administrative                          
Share-based compensation                          
Number of shares vested                         2,500