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Other Long-Term Liabilities - Schedule of Other Long-Term Liabilities (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Other Long Term Liabilities [Abstract]    
Accrued interest on loan payable $ 1,093,568us-gaap_DepositLiabilitiesAccruedInterest $ 497,134us-gaap_DepositLiabilitiesAccruedInterest
Employee compensation 156,439us-gaap_EmployeeBenefitsAndShareBasedCompensation 186,439us-gaap_EmployeeBenefitsAndShareBasedCompensation
Net deferred tax liability   117,815us-gaap_DeferredTaxLiabilitiesNoncurrent
Total other long-term liabilities $ 1,250,007stem_DepositsAndOtherLongTermLiabilities $ 801,388stem_DepositsAndOtherLongTermLiabilities