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REVENUE - Contract Balances (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($)
Contract With Customer, Liability [Roll Forward]
Beginning balance	$ 52,410
Upfront payments received from customers	36,652
Upfront or annual incentive payments received	4,575
Revenue recognized related to amounts that were included in beginning balance of deferred revenue	(32,139)
Revenue recognized related to deferred revenue generated during the period	(12,626)
Ending balance	$ 48,872

X

- Definition

Contract with Customer, Liability, Revenue Recognized During The Period

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Definition

Contract With Customer, Liability

+ References

No definition available.

+ Details

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Namespace Prefix:	stem_
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Balance Type:	na
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X

- Definition

Contract with Customer, Liability, Upfront Or Annual Incentive Payments Received

+ References

No definition available.

+ Details

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Namespace Prefix:	stem_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Contract with Customer, Liability, Upfront Payments Received From Customers

+ References

No definition available.

+ Details

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X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130532-203044

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X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045

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