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Recent Accounting Pronouncement Income Tax Holiday (Details) (USD $)	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Holiday [Line Items]
Reclassification of Unrecognized Tax Benefit Amount		$ 4,700,000rmbs_ReclassificationofUnrecognizedTaxBenefitAmount
Unrecognized Tax Benefits	$ 19,903,000us-gaap_UnrecognizedTaxBenefits		$ 18,794,000us-gaap_UnrecognizedTaxBenefits	$ 16,773,000us-gaap_UnrecognizedTaxBenefits	$ 16,610,000us-gaap_UnrecognizedTaxBenefits

X

- Definition

Represents the amount reclassified from unrecognized tax benefits against deferred tax assets.

+ References

No definition available.

+ Details

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- Details

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Data Type:	xbrli:stringItemType
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X

- Definition

Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

-URI http://asc.fasb.org/extlink&oid=6527854



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15A

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

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