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Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses (Detail) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Payables and Accruals [Abstract] |  |
External services | $ 2,152,770 stem_AccruedLiabilitiesExternalServicesCurrent | $ 1,191,048 stem_AccruedLiabilitiesExternalServicesCurrent
Employee compensation | 2,415,826 us-gaap_EmployeeRelatedLiabilitiesCurrent | 2,655,242 us-gaap_EmployeeRelatedLiabilitiesCurrent
Other | 301,114 us-gaap_OtherAccruedLiabilitiesCurrent | 221,626 us-gaap_OtherAccruedLiabilitiesCurrent
Total accrued expenses and other current liabilities | $ 4,869,710 us-gaap_AccruedLiabilitiesCurrent | $ 4,067,916 us-gaap_AccruedLiabilitiesCurrent

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- Definition Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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