XML 175 R155.htm IDEA: XBRL DOCUMENT v3.21.1

WARRANTS (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2021
Class of Warrant or Right [Line Items]
Number of shares	44,296,242	29,624,663	44,205,800
Convertible promissory notes | 2019 Convertible Notes
Class of Warrant or Right [Line Items]
Number of shares common shares issuable upon conversion	5,000,000
Debt Instrument, Unamortized Discount	$ 1,200
Notes payable
Class of Warrant or Right [Line Items]
Debt Instrument, Unamortized Discount	571		$ 425
Notes payable | 2020 Credit Agreement
Class of Warrant or Right [Line Items]
Debt Instrument, Unamortized Discount	$ 200
Minimum
Class of Warrant or Right [Line Items]
Exercise price	$ 0.36	$ 0.36
Warrant term	1 year	1 year
Maximum
Class of Warrant or Right [Line Items]
Exercise price	$ 1.53	$ 1.53
Warrant term	5 years	5 years	6 years
Series A Preferred Stock Warrants
Class of Warrant or Right [Line Items]
Exercise price	$ 0.4485	$ 0.4485
Number of shares	178,372	178,372
Term	10 years	10 years
Series D Preferred Stock Warrants 2017
Class of Warrant or Right [Line Items]
Exercise price	$ 1.5326	$ 1.5326
Number of shares	6,247,984	6,269,223
Term	7 years	7 years
Series D Preferred Stock Warrants 2019 and 2020
Class of Warrant or Right [Line Items]
Exercise price	$ 1.5326	$ 1.5326
Number of shares	37,869,886	23,177,068
Term	7 years	7 years
Shares reserved for warrants to purchase shares of common stock
Class of Warrant or Right [Line Items]
Number of shares	6,001,639	6,001,639	6,001,639
Shares reserved for warrants to purchase shares of common stock | Minimum
Class of Warrant or Right [Line Items]
Exercise price			$ 0.36
Warrant term			1 year
Shares reserved for warrants to purchase shares of common stock | Maximum
Class of Warrant or Right [Line Items]
Exercise price			$ 1.53

X

- Definition

The period of time over which a warrant may be exercised.

+ References

No definition available.

+ Details

Name:	stem_WarrantTerm
Namespace Prefix:	stem_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- 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

Name:	us-gaap_ClassOfWarrantOrRightLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

Name:	us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of warrants or rights outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount, after accumulated amortization, of debt discount.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentUnamortizedDiscount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

Name:	us-gaap_WarrantsAndRightsOutstandingTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_ConvertibleDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=stem_ConvertibleNotes2019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_NotesPayableOtherPayablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=stem_CreditAgreement2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=stem_SeriesConvertiblePreferredStockWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=stem_SeriesDConvertibleStockWarrants2017Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=stem_SeriesDConvertibleStockWarrants2019And2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=stem_CommonStockWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: