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Stock-Based Compensation - Summary of Changes in Unvested Options (Detail) (Unvested stock options [Member], USD $)	12 Months Ended
	Dec. 31, 2014
Unvested stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options, Beginning balance	18,466stem_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsNonvestedNumber / us-gaap_AwardTypeAxis = stem_UnvestedStockOptionsMember
Number of Options, Granted	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = stem_UnvestedStockOptionsMember
Number of Options, Vested	(16,666)us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares / us-gaap_AwardTypeAxis = stem_UnvestedStockOptionsMember
Number of Options, Cancelled	(1,800)stem_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionEquityInstrumentsForfeitures / us-gaap_AwardTypeAxis = stem_UnvestedStockOptionsMember
Weighted-Average Grant Date Fair Value, Beginning balance	$ 8.11stem_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageGrantDateFairValues / us-gaap_AwardTypeAxis = stem_UnvestedStockOptionsMember
Weighted-Average Grant Date Fair Value, Granted	$ 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = stem_UnvestedStockOptionsMember
Weighted-Average Grant Date Fair Value, Vested	$ 8.30us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = stem_UnvestedStockOptionsMember
Weighted-Average Grant Date Fair Value, Cancelled	$ 6.39stem_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsCancelledInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = stem_UnvestedStockOptionsMember

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- Definition

Share based compensation arrangement by share based payment award equity instruments options nonvested number.

+ References

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Option Equity Instruments Forfeitures

+ References

No definition available.

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- Definition

Share based compensation arrangement by share based payment award options cancelled in period weighted average grant date fair value.

+ References

No definition available.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Options Weighted Average Grant Date Fair Values

+ References

No definition available.

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X

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Number of options vested.

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- Definition

Weighted average grant-date fair value of options vested.

+ References

No definition available.

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