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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