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Stock-Based Compensation - Additional Information (Detail) (USD $) | 3 Months Ended | 0 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2015 Incentive_Plan | Dec. 20, 2013 | Mar. 31, 2014 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Equity incentive plans | 2 stem_NumberOfShareBasedEquityIncentivePlan |  |  |
Shares authorized | 225,000,000 us-gaap_CommonStockSharesAuthorized |  |  | 225,000,000 us-gaap_CommonStockSharesAuthorized
Total unrecognized compensation expense | $ 9,884,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions |  |  |
Vesting period | 2 years 4 months 24 days |  |  |
Equity Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares authorized | 7,856,374 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, outstanding | 110,593 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |  | 110,593 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / 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 | 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 |
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 |  |  |
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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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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