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Goodwill and Other Intangible Assets - Purchase Price Allocated (Detail) (USD $)
0 Months Ended 12 Months Ended
Apr. 30, 2009
Apr. 01, 2009
Dec. 31, 2014
Apr. 01, 2009
Acquired Finite-Lived Intangible Assets [Line Items]        
Weighted-Average Amortization Period     11 years 10 months 24 days  
Net tangible assets   $ 36,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets   $ 36,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
Total   5,135,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet   5,135,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
Customer relationships and developed technology [Member]        
Acquired Finite-Lived Intangible Assets [Line Items]        
Allocated purchase Price   1,310,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= stem_CustomerRelationshipsAndDevelopedTechnologyMember
  1,310,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= stem_CustomerRelationshipsAndDevelopedTechnologyMember
Customer relationships and developed technology [Member] | Minimum [Member]        
Acquired Finite-Lived Intangible Assets [Line Items]        
Weighted-Average Amortization Period   6 years    
Customer relationships and developed technology [Member] | Maximum [Member]        
Acquired Finite-Lived Intangible Assets [Line Items]        
Weighted-Average Amortization Period   9 years    
In-process research and development [Member]        
Acquired Finite-Lived Intangible Assets [Line Items]        
Allocated purchase Price   1,340,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember
  1,340,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember
Trade name [Member]        
Acquired Finite-Lived Intangible Assets [Line Items]        
Weighted-Average Amortization Period 15 years 15 years 15 years  
Allocated purchase Price   310,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
  310,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
Goodwill [Member]        
Acquired Finite-Lived Intangible Assets [Line Items]        
Goodwill   $ 2,139,000stem_BusinessAcquisitionPurchasePriceAllocationsGoodwillAmount
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_GoodwillMember
  $ 2,139,000stem_BusinessAcquisitionPurchasePriceAllocationsGoodwillAmount
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_GoodwillMember