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v2.4.1.9

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 3 Months Ended | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2015 Segment | Dec. 31, 2014 | Nov. 30, 2009 | Dec. 31, 2011 | Dec. 31, 2012 | Apr. 01, 2009
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Number of segments | 1 us-gaap_NumberOfOperatingSegments |  |  |  |  |
Maturity period for market accounts, money market funds and investments | 90 days |  |  |  |  |
Common stock per unit | $ 1 stem_CommonStockPerUnit |  |  |  |  |
Warrants issued per unit | $ 1 stem_WarrantsIssuedPerUnit |  |  |  |  |
Value of patent | $ 0 stem_ContinuingValueOfPatent |  |  |  |  |
Accumulated other comprehensive income | 32,948 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | 65,390 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |  |  |
Stem Cell Sciences Holdings Ltd [Member] |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Aggregate purchase price |  |  |  |  |  | 5,135,000 stem_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceNet / us-gaap_BusinessAcquisitionAxis = stem_StemCellSciencesHoldingsLtdMember
Percentage of purchase price allocated to goodwill |  | 42.00%stem_BusinessAcquisitionGoodwillAsPercentageOfPurchasePrice / us-gaap_BusinessAcquisitionAxis = stem_StemCellSciencesHoldingsLtdMember |  |  |  |
Impairment of Goodwill |  | 1,910,000 us-gaap_GoodwillImpairmentLoss / us-gaap_BusinessAcquisitionAxis = stem_StemCellSciencesHoldingsLtdMember |  |  |  |
Outstanding Warrants [Member] |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Fair value of warrant liability | $ 2,032,000 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember |  |  |  |  |
November 2009 Financing [Member] |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Exercise price of warrants | $ 15.00 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_SubsidiarySaleOfStockAxis = stem_NovemberTwoThousandNineFinancingMember |  |  |  |  |
November 2009 Financing [Member] | Outstanding Warrants [Member] |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Term of warrant |  |  | 5 years |  |  |
November 2009 Financing [Member] | Common Stock [Member] |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Number of securities callable by warrants |  |  | 400,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = stem_NovemberTwoThousandNineFinancingMember |  |  |
Exercise price of warrants |  |  | 15.00 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = stem_NovemberTwoThousandNineFinancingMember |  |  |
December 2011 Financing [Member] | Series A Warrants [Member] |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Number of securities callable by warrants |  |  |  | 8,000,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_ClassOfWarrantOrRightAxis = stem_SeriesAWarrantsMember / us-gaap_SubsidiarySaleOfStockAxis = stem_DecemberTwoThousandElevenFinancingMember |  |
Term of warrant |  |  |  | 5 years |  |
Number of warrants issued upon Series B warrants exercise |  |  |  |  | 2,700,000 stem_ClassOfWarrantOrRightNumberOfWarrantsOrRightsIssued / us-gaap_ClassOfWarrantOrRightAxis = stem_SeriesAWarrantsMember / us-gaap_SubsidiarySaleOfStockAxis = stem_DecemberTwoThousandElevenFinancingMember |
December 2011 Financing [Member] | Series B Warrants [Member] |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Number of securities callable by warrants |  |  |  | 8,000,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_ClassOfWarrantOrRightAxis = stem_SeriesBWarrantsMember / us-gaap_SubsidiarySaleOfStockAxis = stem_DecemberTwoThousandElevenFinancingMember |  |
Exercise price of warrants |  |  |  | 1.25 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = stem_SeriesBWarrantsMember / us-gaap_SubsidiarySaleOfStockAxis = stem_DecemberTwoThousandElevenFinancingMember |  |
Term of warrant |  |  |  | 90 days |  |
Number of warrants exercised |  |  |  |  | 2,700,000 stem_ClassOfWarrantOrRightNumberOfWarrantsOrRightsExercised / us-gaap_ClassOfWarrantOrRightAxis = stem_SeriesBWarrantsMember / us-gaap_SubsidiarySaleOfStockAxis = stem_DecemberTwoThousandElevenFinancingMember |
Number of warrants expired |  |  |  |  | 5,300,000 stem_ClassOfWarrantOrRightNumberOfWarrantsOrRightsExpired / us-gaap_ClassOfWarrantOrRightAxis = stem_SeriesBWarrantsMember / us-gaap_SubsidiarySaleOfStockAxis = stem_DecemberTwoThousandElevenFinancingMember |
December 2011 Financing [Member] | Common Stock [Member] |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Number of shares issued upon Series B warrants exercise |  |  |  |  | 2,700,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = stem_DecemberTwoThousandElevenFinancingMember |
December 2011 Financing [Member] | Common Stock [Member] | Series A Warrants [Member] |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Exercise price of warrants |  |  |  | 1.40 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = stem_SeriesAWarrantsMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = stem_DecemberTwoThousandElevenFinancingMember |  |

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