XML 32 R12.htm IDEA: XBRL DOCUMENT
v3.21.1

Initial Public Offering | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Star Peak Energy Transition Corp [Member] |  |
Initial Public Offering | Note 3—Initial Public Offering ​ Public Units ​ On August 20, 2020, the Company consummated its Initial Public Offering of 35,000,000 Units at $10.00 per Unit, generating gross proceeds of $350.0 million, and incurring offering costs of approximately $20.0 million, inclusive of approximately $12.3 million in deferred underwriting commissions. On August 26, 2020, the Company consummated the sale of 3,358,504 Units at the Initial Public Offering price at $10.00 per Unit pursuant to the notice of partial exercise from the underwriters, generating additional gross proceeds of approximately $33.6 million, and incurring additional offering costs of approximately $1.9 million, inclusive of approximately $1.2 million in deferred underwriting commissions. Each Unit consists of one share of Class A common stock (such shares of Class A common stock included in the Units being offered, the “Public Shares”), and one-third of one redeemable warrant (each, a “Public Warrant”). Each whole Public Warrant entitles the holder to purchase one share of Class A common stock at a price of $11.50 per share, subject to adjustment (see Note 6). | Note 4 — Initial Public Offering Public Units On August 20, 2020, the Company consummated its Initial Public Offering of 35,000,000 Units at $10.00 per Unit, generating gross proceeds of $350.0 million, and incurring offering costs of approximately $20.2 million, inclusive of approximately $12.3 million in deferred underwriting commissions. On August 26, 2020, the Company consummated the sale of 3,358,504 Units at the Initial Public Offering price at $10.00 per Unit pursuant to the notice of partial exercise from the underwriters, generating additional gross proceeds of approximately $33.6 million, and incurring additional offering costs of approximately $1.9 million, inclusive of approximately $1.2 million in deferred underwriting commissions. Each Unit consists of one share of Class A common stock (such shares of Class A common stock included in the Units being offered, the “Public Shares”), and one-third of one redeemable warrant (each, a “Public Warrant”). Each whole Public Warrant entitles the holder to purchase one share of Class A common stock at a price of $11.50 per share, subject to adjustment (see Note 6).

X
- Definition The entire disclosure on information about initial public offering. + References No definition available. + Details
Name: | stem_InitialPublicOfferingTextBlock
Namespace Prefix: | stem_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=stem_StarPeakEnergyTransitionCorpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |