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Stock-Based Compensation (Summary Of Unvested Shares) (Details) (USD $)
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3 Months Ended | 12 Months Ended | |
|---|---|---|---|
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Mar. 31, 2015
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Dec. 31, 2014
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Mar. 31, 2014
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| Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] | |||
| Weighted average fair value at grant date, Vested | $ 0.49rnn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue | $ 0.81rnn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue | |
| Nonvested Options [Member] | |||
| Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] | |||
| Number of nonvested options, outstanding |
6,168,015rnn_NumberOfNonvestedOptionsOutstanding / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = rnn_NonvestedOptionsMember |
3,233,499rnn_NumberOfNonvestedOptionsOutstanding / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = rnn_NonvestedOptionsMember |
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| Number of options, Granted |
3,426,316us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = rnn_NonvestedOptionsMember |
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| Number of options, Vested |
(491,800)rnn_ShareBasedCompensationArragementByShareBasedPaymentAwardOptionsVestedInPeriodGross / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = rnn_NonvestedOptionsMember |
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| Number of options, Cancelled | |||
| Number of nonvested options, outstanding |
6,168,015rnn_NumberOfNonvestedOptionsOutstanding / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = rnn_NonvestedOptionsMember |
3,233,499rnn_NumberOfNonvestedOptionsOutstanding / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = rnn_NonvestedOptionsMember |
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| Weighted average fair value at grant date, Unvested |
$ 0.60rnn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = rnn_NonvestedOptionsMember |
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| Weighted average fair value at grant date, Granted |
$ 0.49rnn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantedWeightedAverageGrantDateFairValue / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = rnn_NonvestedOptionsMember |
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| Weighted average fair value at grant date, Vested |
$ 0.60rnn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = rnn_NonvestedOptionsMember |
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| Weighted average fair value at grant date, Cancelled | |||
| Weighted average fair value at grant date, Unvested |
$ 0.54rnn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = rnn_NonvestedOptionsMember |
$ 0.60rnn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = rnn_NonvestedOptionsMember |
| X | ||||||||||
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- Definition
The number of nonvested options as of the balance sheet date. No definition available.
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| X | ||||||||||
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- Definition
Gross number of share options (or share units) vested during the period. No definition available.
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| X | ||||||||||
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- Definition
The weighted average fair value of nonvested awards cancelled during the period on option plans. No definition available.
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| X | ||||||||||
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- Definition
The weighted average fair value of nonvested awards on option plans as of the grant date. No definition available.
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- Definition
The weighted average fair value of nonvested awards on option plans for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. No definition available.
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| X | ||||||||||
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- Definition
The weighted average fair value of awards vested during the period on option plans. No definition available.
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- Details
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| X | ||||||||||
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- Definition
The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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