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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2022
USD ($)
reporting_unit
segment
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
Nov. 22, 2021
USD ($)
Jun. 30, 2021
shares
Jun. 25, 2021
shares
Concentration Risk [Line Items]            
Net cash outflows related to deferred costs with suppliers $ (37,134) $ (7,540) $ (2,615)      
Net loss $ 124,054 101,211 156,124      
Number of operating segments | segment 1          
Accounts receivable, allowances $ 3,879 91        
Impairment loss of energy storage systems 2,571 4,320 1,395      
Impairment loss of project assets 502 0 0      
Deferred incremental costs of obtaining a contract 9,600 3,000        
Amortization of contract costs 6,300 3,900 800      
Impairment cost losses $ 0 500 100      
Number of reporting units | reporting_unit 1          
Amortization of internal-use software $ 6,800 5,000 4,000      
Amortization expense for intangible assets $ 16,800 0 0      
Sale of project assets, membership interest 100.00%          
Uncertain tax positions recognized $ 0          
Accrual of interest and penalties for uncertain tax positions 0 0        
Interest expense $ 10,468 $ 17,395 $ 20,806      
Net loss per share attributable to Stem common shareholders, basic (in dollars per share) | $ / shares $ (0.81) $ (0.96) $ (4.13)      
Net loss per share attributable to Stem common shareholders, diluted (in dollars per share) | $ / shares (0.81) $ (0.96) $ (4.13)      
Cumulative Effect, Period of Adoption, Adjustment            
Concentration Risk [Line Items]            
Net loss per share attributable to Stem common shareholders, basic (in dollars per share) | $ / shares 0.10          
Net loss per share attributable to Stem common shareholders, diluted (in dollars per share) | $ / shares $ 0.10          
2028 Convertible Notes | Convertible Notes            
Concentration Risk [Line Items]            
Face amount $ 460,000     $ 460,000    
2028 Convertible Notes | Convertible Notes | Cumulative Effect, Period of Adoption, Adjustment            
Concentration Risk [Line Items]            
Interest expense $ 15,300          
Host Customer Arrangements | Minimum            
Concentration Risk [Line Items]            
Contract term 5 years          
Host Customer Arrangements | Maximum            
Concentration Risk [Line Items]            
Contract term 10 years          
Partnership Arrangements | Minimum            
Concentration Risk [Line Items]            
Contract term 10 years          
Partnership Arrangements | Maximum            
Concentration Risk [Line Items]            
Contract term 20 years          
Transfers control of inventory period 1 year          
Public Warrants            
Concentration Risk [Line Items]            
Warrants outstanding (in shares) | shares 0 0        
Private Warrants            
Concentration Risk [Line Items]            
Warrants outstanding (in shares) | shares 0       0 7,181,134
Internally developed software            
Concentration Risk [Line Items]            
Useful Life 5 years          
Energy Storage Systems            
Concentration Risk [Line Items]            
Estimated useful life 10 years          
Variable Interest Entity, Primary Beneficiary            
Concentration Risk [Line Items]            
Contribution paid $ 7,800          
Net loss $ (1,100)          
Revision of Prior Period, Reclassification, Adjustment            
Concentration Risk [Line Items]            
Net cash outflows related to deferred costs with suppliers   $ 7,500 $ 2,600