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v3.5.0.2

Trust Account - Additional Information (Detail) |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Aug. 01, 2016 USD ($) Employees | Jun. 16, 2016 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2016 USD ($)
Trust Account [Line Items] |  |  |  |
Wind-down expense |  |  | $ 3,803,448 | $ 3,803,448
Subsequent Events [Member] |  |  |  |
Trust Account [Line Items] |  |  |  |
Number of impacted employees | Employees | 50 |  |  |
Trust Agreement [Member] |  |  |  |
Trust Account [Line Items] |  |  |  |
Fund transferred to trust under agreement |  | $ 2,300,000 |  |
Negotiated discounts minimum percentage of severance amounts contributed into beneficial trust |  | 50.00% |  |
Trust Agreement [Member] | Subsequent Events [Member] |  |  |  |
Trust Account [Line Items] |  |  |  |
Fund released to employees and tax authorities | $ 2,100,000 |  |  |
Wind-down expense | $ 3,800,000 |  |  |
Number of impacted employees | Employees | 50 |  |  |

X
- Definition Funds released. + References No definition available. + Details
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Namespace Prefix: | stem_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Funds transferred to trust under agreement. + References No definition available. + Details
Name: | stem_FundsTransferredToTrustUnderAgreement
Namespace Prefix: | stem_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Negotiated discounts minimum percentage of severance amounts contributed into beneficial trust. + References No definition available. + Details
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Namespace Prefix: | stem_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of impacted employees due to workforce reduction. + References No definition available. + Details
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Namespace Prefix: | stem_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Trust account. + References No definition available. + Details
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Namespace Prefix: | stem_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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

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

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