Annual report pursuant to Section 13 and 15(d)


Cover - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Mar. 26, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2020    
Current Fiscal Year End Date --12-31    
Entity File Number 001-35817    
Entity Registrant Name CANCER GENETICS, INC.    
Entity Central Index Key 0001349929    
Amendment Flag false    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
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 Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
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    
ICFR Auditor Attestation Flag false    
Entity Shell Company false    
Entity Public Float     $ 6.6
Entity Common Stock, Shares Outstanding   11,007,186  
Documents Incorporated by Reference None.