XML 66 R26.htm IDEA: XBRL DOCUMENT v2.4.0.6

Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2012

Available-for-sale Securities [Abstract]

Cash equivalents and marketable securities classified as available-for-sale

		As of September 30, 2012
(Dollars in thousands)		Fair Value				Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Weighted Rate of Return
Money market funds		$	118,508			$	118,508			$	—			$	—			0.01	%
Corporate notes, bonds and commercial paper		56,886				56,906				—				(20		)		0.21	%
Total cash equivalents and marketable securities		175,394				175,414				—				(20		)
Cash		31,692				31,692				—				—
Total cash, cash equivalents and marketable securities		$	207,086			$	207,106			$	—			$	(20	)

		As of December 31, 2011
(Dollars in thousands)		Fair Value				Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Weighted Rate of Return
Money market funds		$	127,559			$	127,559			$	—			$	—			0.01	%
Corporate notes, bonds and commercial paper		137,108				137,208				—				(100		)		0.29	%
Total cash equivalents and marketable securities		264,667				264,767				—				(100		)
Cash		24,789				24,789				—				—
Total cash, cash equivalents and marketable securities		$	289,456			$	289,556			$	—			$	(100	)

Available-for-sale securities reported at fair value

	September 30, 2012				December 31, 2011
	(Dollars in thousands)
Cash equivalents	$	120,514			$	137,455
Short term marketable securities	54,880				127,212
Total cash equivalents and marketable securities	175,394				264,667
Cash	31,692				24,789
Total cash, cash equivalents and marketable securities	$	207,086			$	289,456

Estimated fair value of cash equivalents and marketable securities classified by the length of time that the securities have been in a continuous unrealized loss position

	Fair Value								Gross Unrealized Loss
	September 30, 2012				December 31, 2011				September 30, 2012				December 31, 2011
	(In thousands)
Less than one year
Corporate notes, bonds and commercial paper	$	46,384			$	137,107			$	(20	)		$	(100	)

X

- Definition

Tabular disclosure of cash and the reconciliation of available-for-sale securities from cost basis to fair value.

+ References

No definition available.

+ Details

Name:	rmbs_ScheduleOfAvailableForSaleSecuritiesReconciliationAndCashTableTextBlock
Namespace Prefix:	rmbs_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Definition

Tabular disclosure of the components of cash, cash equivalents, and short-term investments. Short-term investments may include current marketable securities.

+ References

No definition available.

+ Details

Name:	us-gaap_ScheduleOfCashCashEquivalentsAndShortTermInvestmentsTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563

+ Details

Name:	us-gaap_ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration