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Stock-Based Compensation - Summary of Changes in Unvested Options (Parenthetical) (Detail)	3 Months Ended
	Mar. 31, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted	10,000
Unvested stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted	10,000

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

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

X

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_AwardTypeAxis=stem_UnvestedStockOptionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: