XML 110 R1.htm IDEA: XBRL DOCUMENT v3.19.2
Document And Entity Information
 3 Months Ended
Mar. 31, 2019
Document And Entity Information [Line Items]  
Entity Registrant Name PLUS THERAPEUTICS, INC.
Document Type 8-K
Amendment Flag false
Entity Central Index Key 0001095981
Document Period End Date Mar. 31, 2019
Entity Incorporation, State or Country Code DE
Entity File Number 001-34375
Entity Tax Identification Number 33-0827593
Entity Address, Address Line One 4200 Marathon Blvd.
Entity Address, Address Line Two Suite 200
Entity Address, City or Town Austin
Entity Address, State or Province TX
Entity Address, Postal Zip Code 78756
City Area Code 737
Local Phone Number 255-7194
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock, par value $0.001 [Member]  
Document And Entity Information [Line Items]  
Title of 12(b) Security Common Stock, par value $0.001
Trading Symbol PSTV
Security Exchange Name NASDAQ
Series S Warrant [Member]  
Document And Entity Information [Line Items]  
Title of 12(b) Security Series S Warrant
Trading Symbol PSTVZ
Security Exchange Name NASDAQ