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Consolidated Statements of Cash Flows (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	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