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Note 1 - Business and Organization (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
May 09, 2022
Jan. 14, 2022
Dec. 31, 2022
Dec. 31, 2023
Common Stock, Par or Stated Value Per Share (in dollars per share)     $ 0.01 $ 0.01
GeneDx Holdings Corp [Member]        
Common Stock, Par or Stated Value Per Share (in dollars per share)   $ 0.0001    
ModeX Therapeutics, Inc [Member]        
Payments to Acquire Businesses, Gross $ 300      
Business Acquisition, Share Price (in dollars per share) $ 0.01      
Business Combination, Consideration Transferred $ 300      
ModeX Therapeutics, Inc [Member] | Common Stock [Member]        
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) 89,907,310      
Business Acquisition, Share Price (in dollars per share) $ 2.44      
GeneDx LLC [Member] | GeneDx Holdings Corp [Member]        
Payments to Acquire Businesses, Gross   $ 150    
Business Combination, Consideration Transferred   $ 322    
Ownership, Percentage   5.00%    
GeneDx LLC [Member] | GeneDx Holdings Corp [Member] | Maximum [Member]        
Business Combination, Contingent Consideration Arrangements, Earnout Payment, Shares (in shares)   30,900,000    
GeneDx LLC [Member] | GeneDx Holdings Corp [Member] | Minimum [Member]        
Business Combination, Contingent Consideration Arrangements, Earnout Payment, Shares (in shares)     23,100,000  
GeneDx LLC [Member] | GeneDx Holdings Corp [Member] | Common Class A [Member]        
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)   80,000,000