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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

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