XML 46 R97.htm IDEA: XBRL DOCUMENT
v2.4.0.8

401(k) Plan - Additional Information (Detail) (401 (k) Plan [Member], USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
401 (k) Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer Contribution to plan | 50.00% |  |
Percentage of employee eligible for compensation in the form of shares | 6.00% |  |
Contributions expense | $ 132,000 | $ 130,000 | $ 165,000

X
- Definition Defined contribution plan eligible compensation employer maximum contribution percentage. + References No definition available. + Details
Name: | stem_DefinedContributionPlanEligibleCompensationEmployerMaximumContributionPercentage
Namespace Prefix: | stem_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration