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Stock-Based Compensation - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014 Incentive_Plan	Dec. 31, 2013	Dec. 31, 2012	Dec. 20, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity incentive plans	3stem_NumberOfShareBasedEquityIncentivePlan
Shares authorized	225,000,000us-gaap_CommonStockSharesAuthorized	225,000,000us-gaap_CommonStockSharesAuthorized
Term of years	4 years 2 months 12 days	5 years 1 month 6 days	6 years 4 months 24 days
Total unrecognized compensation expense	$ 3,262,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
Vesting period	2 years 9 months 18 days
Options granted	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Intrinsic value of options at time of exercise		2,214us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	4,319us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Options exercised	0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised	3,452us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised	3,629us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Exercise price	$ 18.18us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized	9,683,022us-gaap_CommonStockSharesAuthorized / us-gaap_PlanNameAxis = stem_EquityIncentivePlansMember
Annual increase in number of shares of common stock	4.00%stem_AnnualIncreaseInNumberOfSharesOfCommonStock / us-gaap_PlanNameAxis = stem_EquityIncentivePlansMember
Aggregate limit of shares issuable to incentive stock option awards	3,000,000stem_AggregateLimitOfSharesIssuableToIncentiveStockOptionAwards / us-gaap_PlanNameAxis = stem_EquityIncentivePlansMember
Initial grant of stock-based compensation in shares				6,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = stem_EquityIncentivePlansMember
Increase in percentage of outstanding number of shares of common stock				4.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum / us-gaap_PlanNameAxis = stem_EquityIncentivePlansMember
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vested grant yearly	25.00%stem_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPercentageYearly / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember
Percentage of vested grant monthly	75.00%stem_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPercentageMonthly / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember
Term of years	10 years
Vesting period of grant date	3 years
Exercise price	$ 20.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember
Number of SARs, Granted	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember
Number of SARs, Exercised	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember
Number of SARs, Forfeited and expired	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeituresAndExpirations / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember
Reduced compensation expense	0stem_IncreaseDecreaseInShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember	0stem_IncreaseDecreaseInShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember	0stem_IncreaseDecreaseInShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units vest and convert into shares of our common stock	1 year
Restricted Stock [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of years	10 years
Vesting period of grant date	3 years
Restricted Stock [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of grant date	1 year
Restricted Stock Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units vest and convert into shares of our common stock	4 years
Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vested grant yearly	25.00%stem_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPercentageYearly / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Percentage of vested grant monthly	75.00%stem_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPercentageMonthly / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Term of years	4 years
Unexercised vested option forfeiture	3 months
Estimated fair value	$ 138,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	$ 406,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	$ 627,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Options [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of years	10 years
Vesting period of grant date	3 years

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