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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	$ 883,000us-gaap_Revenues	$ 82,000us-gaap_Revenues	$ 23,000us-gaap_Revenues	$ 24,000us-gaap_Revenues	$ 45,000us-gaap_Revenues	$ 38,000us-gaap_Revenues	$ 33,000us-gaap_Revenues	$ 56,000us-gaap_Revenues
Operating expenses	10,612,000us-gaap_OperatingExpenses	6,462,000us-gaap_OperatingExpenses	7,983,000us-gaap_OperatingExpenses	6,866,000us-gaap_OperatingExpenses	9,341,000us-gaap_OperatingExpenses	6,628,000us-gaap_OperatingExpenses	6,131,000us-gaap_OperatingExpenses	6,165,000us-gaap_OperatingExpenses	31,922,705us-gaap_OperatingExpenses	28,264,996us-gaap_OperatingExpenses	22,398,175us-gaap_OperatingExpenses
Change in fair value of warrant liability	2,327,000us-gaap_FairValueAdjustmentOfWarrants	4,076,000us-gaap_FairValueAdjustmentOfWarrants	(3,654,000)us-gaap_FairValueAdjustmentOfWarrants	(327,000)us-gaap_FairValueAdjustmentOfWarrants	2,828,000us-gaap_FairValueAdjustmentOfWarrants	(144,000)us-gaap_FairValueAdjustmentOfWarrants	758,000us-gaap_FairValueAdjustmentOfWarrants	(189,000)us-gaap_FairValueAdjustmentOfWarrants	(2,422,451)us-gaap_FairValueAdjustmentOfWarrants	(3,253,253)us-gaap_FairValueAdjustmentOfWarrants	5,944,571us-gaap_FairValueAdjustmentOfWarrants
Impairment of goodwill and other intangible assets	(2,440,000)us-gaap_GoodwillAndIntangibleAssetImpairment								530,100us-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	30,000stem_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	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare	$ 0.00us-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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