Quarterly report pursuant to Section 13 or 15(d)


Cover - shares
9 Months Ended
Sep. 30, 2020
Nov. 09, 2020
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Sep. 30, 2020  
Entity File Number 001-35817  
Entity Registrant Name CANCER GENETICS, INC.  
Entity Central Index Key 0001349929  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q3  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 04-3462475  
Entity Address, Address Line One 201 Route 17 North  
Entity Address, Address Line Two 2nd Floor  
Entity Address, City or Town Rutherford,  
Entity Address, State or Province NJ  
Entity Address, Postal Zip Code 07070  
City Area Code 201  
Local Phone Number 528-9200  
Title of 12(b) Security Common Stock, $0.0001 par value per share  
Trading Symbol CGIX  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   4,074,893