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EMPLOYER RETIREMENT PLAN (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
EMPLOYER RETIREMENT PLAN |  |
401 (k) plan | usgaap:QualifiedPlanMember |
401(k) plan | country:US |
Percentage of compensation employees may defer, minimum | 1.00% |
Percentage of compensation employees may defer, maximum | 75.00% |
No employer match | $ 0 | $ 0

X
- Definition Minimum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | stem_DefinedContributionPlanMinimumAnnualContributionsPerEmployeePercent
Namespace Prefix: | stem_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Indicates location of employer sponsoring defined contribution plan designed to provide retirement benefits. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanSponsorLocationExtensibleList
Namespace Prefix: | us-gaap_
Data Type: | srt-types:extensibleListItemType
Balance Type: | na
Period Type: | instant

X
- Definition Indicates type of defined contribution plan. Includes, but is not limited to, pension plan, other postretirement plan and special and contractual termination benefits payable upon retirement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanTypeExtensibleList
Namespace Prefix: | us-gaap_
Data Type: | srt-types:extensibleListItemType
Balance Type: | na
Period Type: | instant