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Stock-Based Compensation - Additional Information (Detail) (USD $) | 12 Months Ended | 0 Months Ended
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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 | 3 stem_NumberOfShareBasedEquityIncentivePlan |  |  |
Shares authorized | 225,000,000 us-gaap_CommonStockSharesAuthorized | 225,000,000 us-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 | $ 3,262,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions |  |  |
Vesting period | 2 years 9 months 18 days |  |  |
Options granted | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross |
Intrinsic value of options at time of exercise |  | 2,214 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | 4,319 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue |
Options exercised | 0 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 3,452 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 3,629 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |
Exercise price | $ 18.18 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice |  |  |
Equity Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares authorized | 9,683,022 us-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 | 3,000,000 stem_AggregateLimitOfSharesIssuableToIncentiveStockOptionAwards / us-gaap_PlanNameAxis = stem_EquityIncentivePlansMember |  |  |
Initial grant of stock-based compensation in shares |  |  |  | 6,000,000 us-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 | $ 20.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |  |  |
Number of SARs, Granted | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |  |  |
Number of SARs, Exercised | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |  |  |
Number of SARs, Forfeited and expired | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeituresAndExpirations / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |  |  |
Reduced compensation expense | 0 stem_IncreaseDecreaseInShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | 0 stem_IncreaseDecreaseInShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | 0 stem_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 | $ 138,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 406,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 627,000 us-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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