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v3.21.2

REVENUE - Narrative (Details) | 6 Months Ended
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Jun. 30, 2021 segment
Disaggregation of Revenue [Line Items] |
Number of types or revenue arrangements | 2
Host Customer Arrangements |
Disaggregation of Revenue [Line Items] |
Incentive period | 5 years
Estimated benefit period | 10 years
Host Customer Arrangements | Minimum |
Disaggregation of Revenue [Line Items] |
Contract term | 5 years
Host Customer Arrangements | Maximum |
Disaggregation of Revenue [Line Items] |
Contract term | 10 years
Partnership Arrangements | Minimum |
Disaggregation of Revenue [Line Items] |
Contract term | 10 years
Partnership Arrangements | Maximum |
Disaggregation of Revenue [Line Items] |
Contract term | 20 years
Transfers control of inventory period | 1 year

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

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

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- Definition Revenue From Contract With Customer, Incentive Period + References No definition available. + Details
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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Revenue From Contract With Customer, Number Of Types Of Revenue Arrangements + References No definition available. + Details
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- Definition Revenue From Contract With Customer, Transfers Control Of Inventory Period + References No definition available. + Details
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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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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Period Type: |

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- Details
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |