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Consolidated Statements of Comprehensive Loss (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net loss from continuing operations	$ (32,260,663)us-gaap_IncomeLossFromContinuingOperations	$ (25,986,692)us-gaap_IncomeLossFromContinuingOperations	$ (27,971,259)us-gaap_IncomeLossFromContinuingOperations
Other comprehensive income (loss)
Unrealized gains (losses) on marketable securities		1,356us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	1,339us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Comprehensive loss from continuing operations	(32,260,663)stem_ComprehensiveIncomeLossFromContinuingOperations	(25,985,336)stem_ComprehensiveIncomeLossFromContinuingOperations	(27,969,920)stem_ComprehensiveIncomeLossFromContinuingOperations
Discontinued operations:
Net loss from discontinued operations	(480,611)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	(452,467)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	(519,894)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Other comprehensive income (loss)	(186,711)stem_OtherComprehensiveIncomeLossDiscontinuedOperationsNetOfTax	57,568stem_OtherComprehensiveIncomeLossDiscontinuedOperationsNetOfTax	151,125stem_OtherComprehensiveIncomeLossDiscontinuedOperationsNetOfTax
Comprehensive loss from discontinued operations	(667,322)stem_ComprehensiveIncomeLossFromDiscontinuedOperations	(394,899)stem_ComprehensiveIncomeLossFromDiscontinuedOperations	(368,769)stem_ComprehensiveIncomeLossFromDiscontinuedOperations
Comprehensive loss	$ (32,927,985)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	$ (26,380,235)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	$ (28,338,689)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

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Other Comprehensive Income Loss Discontinued Operations Net Of Tax

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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