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Cover - shares
 3 Months Ended
Mar. 31, 2023
Apr. 25, 2023
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2023  
Document Transition Report false  
Entity Registrant Name STEM, INC.  
Entity Incorporation, State or Country Code DE  
Entity File Number 001-39455  
Entity Tax Identification Number 85-1972187  
Entity Address, Address Line One 100 California St., 14th Fl.  
Entity Address, City or Town San Francisco  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94111  
Country Region 1  
City Area Code 877  
Local Phone Number 374-7836  
Title of 12(b) Security Common Stock, par value $0.0001  
Trading Symbol STEM  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   155,528,457
Entity Central Index Key 0001758766  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2023  
Document Fiscal Period Focus Q1  
Amendment Flag false