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v3.21.1

REVENUE - Narrative (Details) | 3 Months Ended
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Mar. 31, 2021 item
Disaggregation of Revenue [Line Items] |
Number of types or revenue arrangements | 2
Performance-based payment period | 5 years
Host Customer Arrangements |
Disaggregation of Revenue [Line Items] |
Estimated benefit period | 10 years
Minimum | Host Customer Arrangements |
Disaggregation of Revenue [Line Items] |
Contract term | 5 years
Minimum | Partnership Arrangements |
Disaggregation of Revenue [Line Items] |
Contract term | 10 years
Maximum | Host Customer Arrangements |
Disaggregation of Revenue [Line Items] |
Contract term | 10 years
Maximum | Partnership Arrangements |
Disaggregation of Revenue [Line Items] |
Contract term | 20 years

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- Definition Revenue From Contract With Customer, Contract Term + References No definition available. + Details
Name: | stem_RevenueFromContractWithCustomerContractTerm
Namespace Prefix: | stem_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Revenue From Contract With Customer, Estimated Benefit Period + References No definition available. + Details
Name: | stem_RevenueFromContractWithCustomerEstimatedBenefitPeriod
Namespace Prefix: | stem_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Revenue From Contract With Customer, Number Of Types Of Revenue Arrangements + References No definition available. + Details
Name: | stem_RevenueFromContractWithCustomerNumberOfTypesOfRevenueArrangements
Namespace Prefix: | stem_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Revenue From Contract With Customer, Performance-Based Payment Period + References No definition available. + Details
Name: | stem_RevenueFromContractWithCustomerPerformanceBasedPaymentPeriod
Namespace Prefix: | stem_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_TypeOfArrangementAxis=stem_HostCustomerArrangementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_TypeOfArrangementAxis=stem_PartnershipArrangementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |