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

X

- 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.

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- Definition

Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale securities impacting investments.

+ References

No definition available.

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+ 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)

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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)

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