XML 85 R64.htm IDEA: XBRL DOCUMENT v2.4.0.6

Stockholders' Equity and Contingently Redeemable Common Stock (Details 2) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended		3 Months Ended	12 Months Ended
	Dec. 31, 2010	Aug. 31, 2010	Sep. 30, 2010	Dec. 31, 2010	Dec. 31, 2011	Feb. 25, 2010
Share repurchase program
Number of shares authorized to be repurchased					19.0
Additional number of shares authorized to be repurchased						12.5
Value of common stock to be repurchased from JP Morgan		$ 90.0
Prepayment to JP Morgan under Share repurchase agreement			90.0
Number of shares delivered by JP Morgan	4.8
Average price of shares delivered by JP Morgan (in dollars per share)	$ 18.88			$ 18.88
Number of shares repurchased during the period				9.5
Value of shares repurchased during the period				195.1
Cumulative shares that have been repurchased in stock repurchase program					26.3
Cumulative value of shares that have been repurchased in stock repurchase program					428.9
Remaining shares authorized to be repurchased					5.2
Increase in accumulated deficit due to stock repurchase				$ 163.6

X

- Definition

Represents an increase or decrease to accumulated deficit when the cost of the shares repurchased exceeds the average original proceeds per share received from the issuance of common stock.

+ References

No definition available.

+ Details

Name:	rmbs_IncreaseInRetainedEarningAccumulatedDeficit
Namespace Prefix:	rmbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the prepayment made to under share repurchase agreement.

+ References

No definition available.

+ Details

Name:	rmbs_ShareRepurchaseAgreementPrepayment
Namespace Prefix:	rmbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the value of common stock to be repurchased under the share repurchase agreement.

+ References

No definition available.

+ Details

Name:	rmbs_ShareRepurchaseAgreementValueOfStockToBeRepurchased
Namespace Prefix:	rmbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents average price of shares delivered under share repurchase agreement.

+ References

No definition available.

+ Details

Name:	rmbs_StockRepurchaseAgreementAveragePriceOfSharesDelivered
Namespace Prefix:	rmbs_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	rmbs_StockRepurchaseProgramAbstract
Namespace Prefix:	rmbs_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the additional number of shares authorized to be repurchased by the entity's Board of Directors under the stock repurchase plan.

+ References

No definition available.

+ Details

Name:	rmbs_StockRepurchaseProgramAdditionalNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix:	rmbs_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The cumulative number of shares that have been repurchased since the commencement of the stock repurchase agreement.

+ References

No definition available.

+ Details

Name:	rmbs_StockRepurchaseProgramCommencementToDateRepurchasedNumberOfShares
Namespace Prefix:	rmbs_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The cumulative value of shares that have been repurchased since the commencement of the stock repurchase agreement.

+ References

No definition available.

+ Details

Name:	rmbs_StockRepurchaseProgramCommencementToDateRepurchasedValue
Namespace Prefix:	rmbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the number of shares delivered under share repurchase agreement.

+ References

No definition available.

+ Details

Name:	rmbs_StockRepurchaseProgramNumberOfSharesDelivered
Namespace Prefix:	rmbs_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 43

-Chapter 1

-Section B

-Paragraph 11A

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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

X

- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30, 31

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 43

-Chapter 1

-Section B

-Paragraph 11A

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_StockRepurchasedDuringPeriodValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant