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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
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Income Tax Holiday [Line Items] |  |  |  |  |
Reclassification of Unrecognized Tax Benefit Amount |  | $ 4,700,000 rmbs_ReclassificationofUnrecognizedTaxBenefitAmount |  |  |
Unrecognized Tax Benefits | $ 19,903,000 us-gaap_UnrecognizedTaxBenefits |  | $ 18,794,000 us-gaap_UnrecognizedTaxBenefits | $ 16,773,000 us-gaap_UnrecognizedTaxBenefits | $ 16,610,000 us-gaap_UnrecognizedTaxBenefits

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- 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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Namespace Prefix: | us-gaap_
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- 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 + Details
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