Document and Entity Information
Jun. 03, 2022
Cover [Abstract]  
Amendment Flag false
Entity Central Index Key 0001692830
Document Type 8-K
Document Period End Date Jun. 03, 2022
Entity Registrant Name SATSUMA PHARMACEUTICALS, INC.
Entity Incorporation State Country Code DE
Entity File Number 001-39041
Entity Tax Identification Number 81-3039831
Entity Address, Address Line One 400 Oyster Point Boulevard
Entity Address, Address Line Two Suite 221
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 410-3200
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock
Trading Symbol STSA
Security Exchange Name NASDAQ
Entity Emerging Growth Company true
Entity Ex Transition Period false