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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.