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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 12, 2020
Jun. 30, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 000-50679    
Entity Registrant Name CORCEPT THERAPEUTICS INC    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 77-0487658    
Entity Address, Address Line One 149 Commonwealth Drive    
Entity Address, City or Town Menlo Park    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94025    
City Area Code 650    
Local Phone Number 327-3270    
Title of 12(b) Security Common Stock, $0.001 par value    
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 Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 1,071,264,355
Entity Common Stock, Shares Outstanding   114,594,745  
Documents Incorporated by Reference
Portions of the Registrant’s definitive proxy statement for its 2020 Annual Meeting of Stockholders are incorporated by reference in Items 10, 11, 12, 13 and 14 of Part III. 
    
Amendment Flag false    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Trading Symbol CORT    
Entity Central Index Key 0001088856    
Current Fiscal Year End Date --12-31