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Common Stock - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended
Jul. 31, 2014
Oct. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2013
Nov. 30, 2008
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Subsidiary, Sale of Stock [Line Items]                    
Common stock issued in public offering 11,299,435us-gaap_StockIssuedDuringPeriodSharesNewIssues 12,845,500us-gaap_StockIssuedDuringPeriodSharesNewIssues                
Sale of common stock and warrant, price per share $ 1.77stem_StockIssuedDuringPeriodNewIssuesSellingPricePerShare $ 1.45stem_StockIssuedDuringPeriodNewIssuesSellingPricePerShare   $ 1.91stem_StockIssuedDuringPeriodNewIssuesSellingPricePerShare $ 2.12stem_StockIssuedDuringPeriodNewIssuesSellingPricePerShare          
Proceeds from issuance of common stock and warrants $ 20,000,000stem_ProceedsFromIssuanceOfCommonStockAndWarrants $ 17,300,000stem_ProceedsFromIssuanceOfCommonStockAndWarrants                
Warrant exercise price $ 2.17us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 $ 1.80us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1                
Warrant expiration period 13 months 5 years                
Gross proceeds     1,974,931us-gaap_ProceedsFromWarrantExercises 530,097us-gaap_ProceedsFromWarrantExercises 6,256,438us-gaap_ProceedsFromWarrantExercises          
Percentage of compensation paid to sales agent       3.00%stem_PercentageOfGrossProceedsPaidToAgent 3.00%stem_PercentageOfGrossProceedsPaidToAgent          
Gross proceeds from common stock     18,949,647us-gaap_ProceedsFromIssuanceOfCommonStock 23,491,597us-gaap_ProceedsFromIssuanceOfCommonStock 19,747,550us-gaap_ProceedsFromIssuanceOfCommonStock          
Common stock, par value   $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare            
Warrants termination agreement     2013-10              
Common stock, sold       1,733,771us-gaap_StockIssuedDuringPeriodSharesIssuedForCash 9,647,471us-gaap_StockIssuedDuringPeriodSharesIssuedForCash          
Institutional Investors [Member]                    
Subsidiary, Sale of Stock [Line Items]                    
Shares available to sale           30,000,000stem_SaleOfStockValueOfSharesAvailableForTransaction
/ us-gaap_RelatedPartyTransactionAxis
= stem_InstitutionalInvestorsMember		        
Gross proceeds from common stock           3,000,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_RelatedPartyTransactionAxis
= stem_InstitutionalInvestorsMember		        
Exercise period of rights           3 years        
Additional amounts of common stock to sell           27,000,000stem_RightToSellCommonStockAdditionalAmounts
/ us-gaap_RelatedPartyTransactionAxis
= stem_InstitutionalInvestorsMember		        
Outstanding Warrants [Member]                    
Subsidiary, Sale of Stock [Line Items]                    
Number of shares of common stock or warrant in each unit sold to institutional investors 1stem_InstitutionalInvestorsUnitsCommonStockSharesIssuedPerUnit
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember		 1stem_InstitutionalInvestorsUnitsCommonStockSharesIssuedPerUnit
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember		         1stem_InstitutionalInvestorsUnitsCommonStockSharesIssuedPerUnit
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember		      
Series A Warrants [Member]                    
Subsidiary, Sale of Stock [Line Items]                    
Warrant exercise price     $ 1.40us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= stem_SeriesWarrantMember		              
Proceeds from sale of stock     1,652,000us-gaap_SaleOfStockConsiderationReceivedOnTransaction
/ us-gaap_ClassOfWarrantOrRightAxis
= stem_SeriesWarrantMember		 538,000us-gaap_SaleOfStockConsiderationReceivedOnTransaction
/ us-gaap_ClassOfWarrantOrRightAxis
= stem_SeriesWarrantMember		 3,078,000us-gaap_SaleOfStockConsiderationReceivedOnTransaction
/ us-gaap_ClassOfWarrantOrRightAxis
= stem_SeriesWarrantMember		          
Series A Warrants [Member]                    
Subsidiary, Sale of Stock [Line Items]                    
Number of shares exercise     1,180,015stem_ClassOfWarrantOrRightExerciseOfWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= stem_SeriesAWarrantsMember		              
Gross proceeds     1,652,000us-gaap_ProceedsFromWarrantExercises
/ us-gaap_ClassOfWarrantOrRightAxis
= stem_SeriesAWarrantsMember		              
Series B Warrant [Member]                    
Subsidiary, Sale of Stock [Line Items]                    
Gross proceeds               3,375,000us-gaap_ProceedsFromWarrantExercises
/ us-gaap_StatementClassOfStockAxis
= stem_SeriesBWarrantMember		    
Number of warrants exercised               2,700,000stem_WarrantIssuedForWarrantExercised
/ us-gaap_StatementClassOfStockAxis
= stem_SeriesBWarrantMember		    
Number of warrants expired         5,300,000stem_ClassOfWarrantOrRightNumberOfWarrantsOrRightsExpired
/ us-gaap_StatementClassOfStockAxis
= stem_SeriesBWarrantMember		          
Warrant expiration date         May 02, 2012          
Series A Warrants [Member]                    
Subsidiary, Sale of Stock [Line Items]                    
Gross proceeds         3,078,000us-gaap_ProceedsFromWarrantExercises
/ us-gaap_StatementClassOfStockAxis
= stem_SeriesWarrantMember		          
Number of warrants exercised     1,180,015stem_ClassOfWarrantOrRightNumberOfWarrantsOrRightsExercised
/ us-gaap_StatementClassOfStockAxis
= stem_SeriesWarrantMember		              
Number of warrants exercised         2,198,571stem_WarrantIssuedForWarrantExercised
/ us-gaap_StatementClassOfStockAxis
= stem_SeriesWarrantMember		          
Number of warrants issued               2,700,000stem_NumberOfSeriesWarrantsIssued
/ us-gaap_StatementClassOfStockAxis
= stem_SeriesWarrantMember		    
December 2011 Financing [Member] | Series A Warrants [Member]                    
Subsidiary, Sale of Stock [Line Items]                    
Numbers of share issued                   8,000,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= stem_SeriesWarrantMember
/ us-gaap_SubsidiarySaleOfStockAxis
= stem_DecemberTwoThousandElevenFinancingMember
Number of warrants exercised       384,534stem_ClassOfWarrantOrRightNumberOfWarrantsOrRightsExercised
/ us-gaap_ClassOfWarrantOrRightAxis
= stem_SeriesWarrantMember
/ us-gaap_SubsidiarySaleOfStockAxis
= stem_DecemberTwoThousandElevenFinancingMember		            
Number of warrants exercised     1,180,015stem_WarrantIssuedForWarrantExercised
/ us-gaap_ClassOfWarrantOrRightAxis
= stem_SeriesWarrantMember
/ us-gaap_SubsidiarySaleOfStockAxis
= stem_DecemberTwoThousandElevenFinancingMember		 384,534stem_WarrantIssuedForWarrantExercised
/ us-gaap_ClassOfWarrantOrRightAxis
= stem_SeriesWarrantMember
/ us-gaap_SubsidiarySaleOfStockAxis
= stem_DecemberTwoThousandElevenFinancingMember		 2,198,571stem_WarrantIssuedForWarrantExercised
/ us-gaap_ClassOfWarrantOrRightAxis
= stem_SeriesWarrantMember
/ us-gaap_SubsidiarySaleOfStockAxis
= stem_DecemberTwoThousandElevenFinancingMember		          
Number of shares issued upon warrants exercise         2,700,000stem_NumberOfWarrantExercised
/ us-gaap_ClassOfWarrantOrRightAxis
= stem_SeriesWarrantMember
/ us-gaap_SubsidiarySaleOfStockAxis
= stem_DecemberTwoThousandElevenFinancingMember		          
December 2011 Financing [Member] | Series A Warrants [Member]                    
Subsidiary, Sale of Stock [Line Items]                    
Number of securities callable by each warrant or right warrants     1us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_ClassOfWarrantOrRightAxis
= stem_SeriesAWarrantsMember
/ us-gaap_SubsidiarySaleOfStockAxis
= stem_DecemberTwoThousandElevenFinancingMember		              
Numbers of share issued                   8,000,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= stem_SeriesAWarrantsMember
/ us-gaap_SubsidiarySaleOfStockAxis
= stem_DecemberTwoThousandElevenFinancingMember
2012 Amended Sales Agreement [Member]                    
Subsidiary, Sale of Stock [Line Items]                    
Percentage of compensation paid to sales agent     2.00%stem_PercentageOfGrossProceedsPaidToAgent
/ us-gaap_SubsidiarySaleOfStockAxis
= stem_TwoThousandTwelveAmendedSalesAgreementMember		              
Shares available to sale                 30,000,000stem_SaleOfStockValueOfSharesAvailableForTransaction
/ us-gaap_SubsidiarySaleOfStockAxis
= stem_TwoThousandTwelveAmendedSalesAgreementMember		  
Gross proceeds from common stock     $ 285,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_SubsidiarySaleOfStockAxis
= stem_TwoThousandTwelveAmendedSalesAgreementMember		              
Common Stock [Member]                    
Subsidiary, Sale of Stock [Line Items]                    
Number of shares of common stock or warrant in each unit sold to institutional investors 1stem_InstitutionalInvestorsUnitsCommonStockSharesIssuedPerUnit
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 1stem_InstitutionalInvestorsUnitsCommonStockSharesIssuedPerUnit
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		                
Number of securities callable by each warrant or right warrants 0.85us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 0.5us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		                
Numbers of share issued     1,180,015us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		              
Number of shares issued upon warrants exercise         2,198,571stem_NumberOfWarrantExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		     2,700,000stem_NumberOfWarrantExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		    
Common Stock [Member] | Institutional Investors [Member]                    
Subsidiary, Sale of Stock [Line Items]                    
Common stock issued in public offering           329,131us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_RelatedPartyTransactionAxis
= stem_InstitutionalInvestorsMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Common stock, sold           1,645,639us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
/ us-gaap_RelatedPartyTransactionAxis
= stem_InstitutionalInvestorsMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Sale of stock, price per share           $ 1.823us-gaap_SaleOfStockPricePerShare
/ us-gaap_RelatedPartyTransactionAxis
= stem_InstitutionalInvestorsMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Common Stock [Member] | December 2011 Financing [Member]                    
Subsidiary, Sale of Stock [Line Items]                    
Common stock issued in public offering       384,534us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= stem_DecemberTwoThousandElevenFinancingMember		 2,700,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= stem_DecemberTwoThousandElevenFinancingMember		          
Number of securities callable by each warrant or right warrants     1us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= stem_DecemberTwoThousandElevenFinancingMember		              
Number of shares issued upon warrants exercise     1,180,015stem_NumberOfWarrantExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= stem_DecemberTwoThousandElevenFinancingMember		 384,534stem_NumberOfWarrantExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= stem_DecemberTwoThousandElevenFinancingMember		 2,198,571stem_NumberOfWarrantExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= stem_DecemberTwoThousandElevenFinancingMember		          
Common Stock [Member] | December 2011 Financing [Member] | Series A Warrants [Member]                    
Subsidiary, Sale of Stock [Line Items]                    
Warrant exercise price                   1.40us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= stem_SeriesWarrantMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= stem_DecemberTwoThousandElevenFinancingMember
Common Stock [Member] | December 2011 Financing [Member] | Series A Warrants [Member]                    
Subsidiary, Sale of Stock [Line Items]                    
Warrant exercise price                   1.40us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= stem_SeriesAWarrantsMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= stem_DecemberTwoThousandElevenFinancingMember
Common Stock [Member] | 2012 Amended Sales Agreement [Member]                    
Subsidiary, Sale of Stock [Line Items]                    
Common stock, sold     193,271us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= stem_TwoThousandTwelveAmendedSalesAgreementMember		              
Sale of stock, price per share     $ 1.47us-gaap_SaleOfStockPricePerShare
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= stem_TwoThousandTwelveAmendedSalesAgreementMember