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Stock-Based Compensation (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 22, 2024 | Jan. 31, 2024 | Mar. 31, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2023 | Dec. 31, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock option grants | [1] |  |  |  |  |  | 3,618,000 | 2,365,000
Stock Issued During Period, Value, Employee Stock Purchase Plan |  |  |  |  |  |  | $ 551 | $ 109
Subsequent Event [Member] | Employees [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock options granted |  | 2,895,000 |  |  |  |  |  |
Weighted average exercise price |  | $ 1.25 |  |  |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Restricted stock awards granted |  |  |  |  |  |  | 550,000 | 320,000
2018 Equity Plan [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares reserved for issuance |  |  |  |  |  |  | 11,644,000 |
Number of shares available for grant |  |  |  |  |  |  | 2,832,133 |
2018 Equity Plan [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares available for grant |  |  | 2,680,038 |  |  |  |  |
2018 Equity Plan [Member] | Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Weighted average estimated fair value |  |  |  |  |  |  | $ 0.88 | $ 2.30
Outside of 2018 Plan [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock option grants |  |  |  |  |  |  | 423,300 | 423,300
Outside of 2018 Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Restricted stock awards granted |  |  |  |  |  |  | 50,000 |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares reserved for issuance |  |  |  |  |  |  | 1,000,000 |
Number of shares available for grant |  |  |  |  |  |  | 407,770 |
Stock Issued During Period, Shares, Employee Stock Purchase Plans |  |  |  | 231,987 | 276,213 | 84,030 |  |
Stock Issued During Period, Value, Employee Stock Purchase Plan |  |  |  | $ 276 | $ 275 | $ 109 |  |
Employee Stock Purchase Plan [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Other Share Increase (Decrease) |  |  | 500,000 |  |  |  |  |
[1] | Stock options granted under the Lucid Diagnostics 2018 Equity Plan and those granted outside such plan generally vest one-third in one year then ratably over the next eight quarters, and have a ten-year contractual term from date-of-grant.

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