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Cover
May 25, 2021
Entity Listings [Line Items]  
Document Type 8-K
Document Period End Date May 25, 2021
Entity Registrant Name STEM, INC.
Entity Incorporation, State or Country Code DE
Entity File Number 333-251397
Entity Tax Identification Number 85-1972187
Entity Address, Address Line One 100 Rollins Road,
Entity Address, City or Town Millbrae
Entity Address, State or Province CA
Entity Address, Postal Zip Code 94030
City Area Code 415
Local Phone Number 937-7816
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company true
Entity Ex Transition Period false
Amendment Flag false
Entity Central Index Key 0001758766
Common Stock  
Entity Listings [Line Items]  
Title of 12(b) Security Common stock, par value $0.0001
Trading Symbol STEM
Security Exchange Name NYSE
Common Stock Warrants  
Entity Listings [Line Items]  
Title of 12(b) Security Warrants exercisable for Common Stock
Trading Symbol STEM WS
Security Exchange Name NYSE