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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 |  |  |

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