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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2020
Mar. 09, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2020    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Entity Registrant Name PLIANT THERAPEUTICS, INC.    
Entity Central Index Key 0001746473    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Interactive Data Current Yes    
Current Fiscal Year End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Entity Well-known Seasoned Issuer No    
Entity Public Float     $ 855,889,147
ICFR Auditor Attestation Flag false    
Entity Common Stock, Shares Outstanding   35,738,192  
Entity Shell Company false    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
Title of 12(b) Security Common Stock, par value $0.0001 per share    
Trading Symbol PLRX    
Security Exchange Name NASDAQ    
Entity File Number 001-39303    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 47-4272481    
Entity Address, Address Line One 260 Littlefield Avenue    
Entity Address, City or Town South San Francisco    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94080    
City Area Code 650    
Local Phone Number 481-6770    
Document Annual Report true    
Document Transition Report false    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s definitive Proxy Statement for the 2021 Annual Meeting of Stockholders to be filed with the U.S. Securities and Exchange Commission pursuant to Regulation 14A not later than 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K are incorporated by reference in Part III, Items 10-14 of this Annual Report on Form 10-K