XML 12 R39.htm IDEA: XBRL DOCUMENT v2.4.0.8

Stock-Based Compensation - Summary of Changes in Unvested Options (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average exercise price per share, Beginning balance	$ 19.97
Weighted-average exercise price per share, Granted
Weighted-average exercise price per share, Ending balance	$ 18.05
Unvested stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options, Beginning balance	18,466
Number of options, Granted
Number of options, Vested	(9,283)
Number of options, Cancelled	(1,591)
Number of options, Ending balance	7,592
Weighted-average exercise price per share, Beginning balance	$ 10.17
Weighted-average exercise price per share, Granted
Weighted-average exercise price per share, Vested	$ 10.45
Weighted-average exercise price per share, Cancelled	$ 8.13
Weighted-average exercise price per share, Ending balance	$ 10.27
Weighted-average grant date fair value per option, Beginning balance	$ 8.11
Weighted-average grant date fair value per option, Granted
Weighted-average grant date fair value per option, Vested	$ 8.33
Weighted-average grant date fair value per option, Cancelled	$ 6.12
Weighted-average grant date fair value per option, Ending balance	$ 8.26

X

- Definition

Share based compensation arrangement by share based payment award equity instruments options nonvested number.

+ References

No definition available.

+ Details

Name:	stem_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsNonvestedNumber
Namespace Prefix:	stem_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Share Based Compensation Arrangement By Share Based Payment Award Option Equity Instruments Forfeitures

+ References

No definition available.

+ Details

Name:	stem_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionEquityInstrumentsForfeitures
Namespace Prefix:	stem_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Share based compensation arrangement by share based payment award options cancelled in period weighted average grant date fair value.

+ References

No definition available.

+ Details

Name:	stem_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsCancelledInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	stem_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Share based compensation arrangement by share based payment award options vested in period weighted average grant date fair value.

+ References

No definition available.

+ Details

Name:	stem_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	stem_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Share Based Compensation Arrangement By Share Based Payment Award Options Weighted Average Grant Date Fair Values

+ References

No definition available.

+ Details

Name:	stem_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageGrantDateFairValues
Namespace Prefix:	stem_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Share based compensation arrangements by share based payment award options vested in period weighted average exercise price.

+ References

No definition available.

+ Details

Name:	stem_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsVestedInPeriodWeightedAverageExercisePrice
Namespace Prefix:	stem_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Weighted average price of options that were either forfeited or expired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(3)-(4)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of options vested.

+ References

No definition available.

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration