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Consolidated Statements of Cash Flows (Parenthetical) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011
Consolidated Statements of Cash Flows [Abstract] |
Cash excluding from net assets acquired | $ 168

X
- Definition Cash excluding from net assets acquired + References No definition available. + Details
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Namespace Prefix: | rxii_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_StatementOfCashFlowsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration