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Stock-Based Compensation - Summary of Restricted Stock Unit Activity (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Restricted stock units vest description | 228,874 of these restricted stock units vest and convert into shares of our common stock after one year from the date of grant. 150,000 of these restricted stock units vest and convert into shares of our common stock over a three year period from the date of grant: one-third of the award will vest on each grant date anniversary following the grant. 1,296,000 of these restricted stock units vest and convert into shares of our common stock over a four year period from the date of grant: one-fourth of the award will vest on each grant date anniversary following the grant.
Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of restricted units would vest over vesting period | 228,874 stem_NumberOfRestrictedUnitWouldVestOverVestingPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Restricted stock units vest and convert into shares of our common stock | 1 year
Restricted Stock Two [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of restricted units would vest over vesting period | 150,000 stem_NumberOfRestrictedUnitWouldVestOverVestingPeriod / us-gaap_AwardTypeAxis = stem_RestrictedStockTwoMember
Restricted stock units vest and convert into shares of our common stock | 3 years
Restricted stock units vested description after specified period | 0.3333 stem_RestrictedStockUnitsVestedDescriptionAfterSpecifiedPeriod / us-gaap_AwardTypeAxis = stem_RestrictedStockTwoMember
Restricted Stock Three [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Restricted stock units vest and convert into shares of our common stock | 4 years
Restricted stock units vested description after specified period | 0.25 stem_RestrictedStockUnitsVestedDescriptionAfterSpecifiedPeriod / us-gaap_AwardTypeAxis = stem_RestrictedStockThreeMember
Number of restricted units vest and convert into common stock over next fiscal year | 1,296,000 stem_NumberOfRestrictedUnitVestOverNextFiscalYear / us-gaap_AwardTypeAxis = stem_RestrictedStockThreeMember

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- Definition Restricted Stock Units Vested Description After Specified Period + References No definition available. + Details
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- Definition Restricted Stock Unit Vest Description + References No definition available. + Details
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- Details
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