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Accrued Wind-Down Expenses - Summary of Wind-Down Expenses (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2016
Restructuring Cost and Reserve [Line Items] |  |
Total wind-down expense | $ 2,694 | $ 3,806,142
Employee Related [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Total wind-down expense |  | 3,135,182
External Services [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Total wind-down expense |  | 319,953
Legal [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Total wind-down expense |  | 286,134
Facilities Related [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Total wind-down expense |  | (590,505)
Clinical Trials Closeout [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Total wind-down expense |  | 430,834
Other [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Total wind-down expense |  | $ 224,544

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- Definition Wind down expenses. + References No definition available. + Details
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Namespace Prefix: | stem_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |