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Quarterly Financial Data - Summary of Quarterly Financial Data (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Continuing operations: |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 883,000 us-gaap_Revenues | $ 82,000 us-gaap_Revenues | $ 23,000 us-gaap_Revenues | $ 24,000 us-gaap_Revenues | $ 45,000 us-gaap_Revenues | $ 38,000 us-gaap_Revenues | $ 33,000 us-gaap_Revenues | $ 56,000 us-gaap_Revenues |  |  |
Operating expenses | 10,612,000 us-gaap_OperatingExpenses | 6,462,000 us-gaap_OperatingExpenses | 7,983,000 us-gaap_OperatingExpenses | 6,866,000 us-gaap_OperatingExpenses | 9,341,000 us-gaap_OperatingExpenses | 6,628,000 us-gaap_OperatingExpenses | 6,131,000 us-gaap_OperatingExpenses | 6,165,000 us-gaap_OperatingExpenses | 31,922,705 us-gaap_OperatingExpenses | 28,264,996 us-gaap_OperatingExpenses | 22,398,175 us-gaap_OperatingExpenses
Change in fair value of warrant liability | 2,327,000 us-gaap_FairValueAdjustmentOfWarrants | 4,076,000 us-gaap_FairValueAdjustmentOfWarrants | (3,654,000)us-gaap_FairValueAdjustmentOfWarrants | (327,000)us-gaap_FairValueAdjustmentOfWarrants | 2,828,000 us-gaap_FairValueAdjustmentOfWarrants | (144,000)us-gaap_FairValueAdjustmentOfWarrants | 758,000 us-gaap_FairValueAdjustmentOfWarrants | (189,000)us-gaap_FairValueAdjustmentOfWarrants | (2,422,451)us-gaap_FairValueAdjustmentOfWarrants | (3,253,253)us-gaap_FairValueAdjustmentOfWarrants | 5,944,571 us-gaap_FairValueAdjustmentOfWarrants
Impairment of goodwill and other intangible assets | (2,440,000)us-gaap_GoodwillAndIntangibleAssetImpairment |  |  |  |  |  |  |  | 530,100 us-gaap_GoodwillAndIntangibleAssetImpairment |  |
Interest and other income (expense), net | (266,000)stem_InterestAndOtherIncomeExpenseNet | (316,000)stem_InterestAndOtherIncomeExpenseNet | (357,000)stem_InterestAndOtherIncomeExpenseNet | (394,000)stem_InterestAndOtherIncomeExpenseNet | (380,000)stem_InterestAndOtherIncomeExpenseNet | (392,000)stem_InterestAndOtherIncomeExpenseNet | (405,000)stem_InterestAndOtherIncomeExpenseNet | 30,000 stem_InterestAndOtherIncomeExpenseNet |  |  |
Net loss from continuing operations | (10,108,000)us-gaap_IncomeLossFromContinuingOperations | (2,620,000)us-gaap_IncomeLossFromContinuingOperations | (11,971,000)us-gaap_IncomeLossFromContinuingOperations | (7,562,000)us-gaap_IncomeLossFromContinuingOperations | (6,848,000)us-gaap_IncomeLossFromContinuingOperations | (7,126,000)us-gaap_IncomeLossFromContinuingOperations | (5,745,000)us-gaap_IncomeLossFromContinuingOperations | (6,268,000)us-gaap_IncomeLossFromContinuingOperations | (32,260,663)us-gaap_IncomeLossFromContinuingOperations | (25,986,692)us-gaap_IncomeLossFromContinuingOperations | (27,971,259)us-gaap_IncomeLossFromContinuingOperations
Discontinued operations: |  |  |  |  |  |  |  |  |  |  |
Net loss from discontinued operations | (30,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (137,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (144,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (58,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (115,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (66,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (124,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (149,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (369,357)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (452,467)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (519,894)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net loss from disposal of assets | $ (111,000)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  |  |  |  |  |  |  | $ (111,254)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  |
Basic and diluted net loss per share: |  |  |  |  |  |  |  |  |  |  |
Continuing operations | $ (0.15)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ (0.04)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ (0.21)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ (0.14)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ (0.13)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ (0.17)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ (0.14)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ (0.16)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ (0.52)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ (0.60)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ (0.97)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare
Discontinued operations | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare
Basic and diluted net loss per share | $ (0.15)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.04)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.21)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.14)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.13)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.17)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.15)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.17)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.53)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.61)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.99)us-gaap_EarningsPerShareBasicAndDiluted

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