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Financial Instruments - Cash and Cash Equivalents (Detail) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 24,987,603 us-gaap_AvailableForSaleSecuritiesAmortizedCost | $ 30,585,424 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Gross Unrealized Gains | 0 stem_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments | 0 stem_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
Gross Unrealized Losses | 0 stem_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments | 0 stem_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments
Fair Value | 24,987,603 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue | 30,585,424 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Cash [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,398,928 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CashMember | 1,355,281 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CashMember
Gross Unrealized Gains | 0 stem_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CashMember | 0 stem_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CashMember
Gross Unrealized Losses | 0 stem_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CashMember | 0 stem_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CashMember
Fair Value | 1,398,928 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CashMember | 1,355,281 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CashMember
Cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 23,588,675 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CashEquivalentsMember | 29,230,143 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CashEquivalentsMember
Gross Unrealized Gains | 0 stem_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CashEquivalentsMember | 0 stem_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CashEquivalentsMember
Gross Unrealized Losses | 0 stem_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CashEquivalentsMember | 0 stem_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CashEquivalentsMember
Fair Value | $ 23,588,675 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CashEquivalentsMember | $ 29,230,143 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CashEquivalentsMember

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- Definition Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments. + References No definition available. + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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