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Number of Significant Clients

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Additions made to capitalized computer software costs during the period.

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For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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Basis of Presentation and Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended			78 Months Ended	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Mar. 31, 2014
Basis of Presentation and Significant Accounting Polcies [Line Items]
BESP 5pct of Revenue	0.00%rpxc_BESP5pctofRevenue			0.00%rpxc_BESP5pctofRevenue
Restricted cash (current and non-current)	$ 1,675	$ 1,818		1,675
Capitalization of internal-use sofware and website development costs	1,200	1,200	1,900
Amortization of internal-use sofware and website development costs	$ 1,300	$ 1,100	$ 800
Accounts receivable
Basis of Presentation and Significant Accounting Polcies [Line Items]
Number of Significant Clients	3	4		3
Sales Revenue, Subscription Fee
Basis of Presentation and Significant Accounting Polcies [Line Items]
Number of Significant Clients	0	0	0	0
Client One \| Accounts receivable
Basis of Presentation and Significant Accounting Polcies [Line Items]
Concentration of credit risk, percentage	28.00%	18.00%
Client Two \| Accounts receivable
Basis of Presentation and Significant Accounting Polcies [Line Items]
Concentration of credit risk, percentage	24.00%	16.00%
Client Three \| Accounts receivable
Basis of Presentation and Significant Accounting Polcies [Line Items]
Concentration of credit risk, percentage	14.00%	13.00%
Client Four \| Accounts receivable
Basis of Presentation and Significant Accounting Polcies [Line Items]
Concentration of credit risk, percentage		11.00%
Internal-use software
Basis of Presentation and Significant Accounting Polcies [Line Items]
Patent assets, useful life	3 years
Weighted Average \| Patents
Basis of Presentation and Significant Accounting Polcies [Line Items]
Patent assets, useful life	39 months			45 months
Maximum
Basis of Presentation and Significant Accounting Polcies [Line Items]
Property, Plant and Equipment, Useful Life					5 years
Maximum \| Patents
Basis of Presentation and Significant Accounting Polcies [Line Items]
Patent assets, useful life	60 months
Minimum
Basis of Presentation and Significant Accounting Polcies [Line Items]
Property, Plant and Equipment, Useful Life					3 years
Minimum \| Patents
Basis of Presentation and Significant Accounting Polcies [Line Items]
Patent assets, useful life	24 months