XML 246 R226.htm IDEA: XBRL DOCUMENT v3.21.1

CONVERTIBLE PREFERRED STOCK AND COMMON STOCK - Schedule of Shares Reserved for Issuance (Details) - shares	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Reserved shares of common stock for issuance ( in shares)	270,663,755	277,129,612	273,914,985
Shares reserved for convertible preferred stock outstanding
Class of Stock [Line Items]
Reserved shares of common stock for issuance ( in shares)	175,531,186	175,440,744	191,142,894
Shares reserved for warrants to purchase shares of common stock
Class of Stock [Line Items]
Reserved shares of common stock for issuance ( in shares)	6,001,639	6,001,639	6,001,639
Shares reserved for warrants to purchase shares of preferred stock
Class of Stock [Line Items]
Reserved shares of common stock for issuance ( in shares)	44,205,800	44,296,242	29,624,663
Options issued and outstanding
Class of Stock [Line Items]
Reserved shares of common stock for issuance ( in shares)	44,914,082	51,379,939	42,846,649
Shares available for future option grants
Class of Stock [Line Items]
Reserved shares of common stock for issuance ( in shares)	11,048	11,048	4,299,140

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

X

- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_ConvertiblePreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=stem_PreferredStockWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_StockCompensationPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: