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Document and Entity Information
May 01, 2025
Document And Entity Information [Line Items]  
Document Type 8-K
Document Period End Date May 01, 2025
Entity Registrant Name PLIANT THERAPEUTICS, INC.
Entity Incorporation State Country Code DE
Entity File Number 001-39303
Entity Tax Identification Number 47-4272481
Entity Address Address Line 1 331 Oyster Point Boulevard
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
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Entity Central Index Key 0001746473
Amendment Flag false
Common Stock, par value $0.0001 per share [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Common Stock, par value $0.0001 per share
Trading Symbol PLRX
Security Exchange Name NASDAQ
Series A Junior Participating Preferred Rights [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Series A Junior Participating Preferred Rights
Security Exchange Name NASDAQ
No Trading Symbol Flag true