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Condensed Consolidated Statements of Cash Flows (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES    
Net Loss $ (2,228,000)us-gaap_NetIncomeLoss $ (3,947,000)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 111,000us-gaap_DepreciationAndAmortization 13,000us-gaap_DepreciationAndAmortization
Amortization of deferred finance costs   709,000us-gaap_AmortizationOfDeferredCharges
Stock-based compensation 440,000us-gaap_ShareBasedCompensation  
Non-cash investment income (6,000)us-gaap_IncomeLossFromEquityMethodInvestments  
Fair value adjustments to warrant and derivative liabilities   2,267,000resn_FairValueAdjustmentOfWarrantsAndDerivative
Changes in assets and liabilities:    
Prepaids and other current assets   45,000us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable 185,000us-gaap_IncreaseDecreaseInAccountsPayable 99,000us-gaap_IncreaseDecreaseInAccountsPayable
Accrued expenses (125,000)us-gaap_IncreaseDecreaseInAccruedLiabilities (57,000)us-gaap_IncreaseDecreaseInAccruedLiabilities
Accrued compensation 59,000us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities 62,000us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities
Deferred rent (9,000)us-gaap_IncreaseDecreaseInDeferredRevenue  
Net cash used in operating activities (1,573,000)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (809,000)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
CASH FLOWS FROM INVESTING ACTIVITIES    
Capital expenditures (64,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (150,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Expenditures for patents and domain names (121,000)us-gaap_PaymentsToAcquireIntangibleAssets (47,000)us-gaap_PaymentsToAcquireIntangibleAssets
Purchase of restricted cash investment (100,000)us-gaap_PaymentsToAcquireRestrictedCertificatesOfDeposit  
Sale of investment held-to-maturity 8,000,000us-gaap_ProceedsFromSaleOfHeldToMaturitySecurities  
Purchase of investments held-to-maturity (8,989,000)us-gaap_PaymentsToAcquireHeldToMaturitySecurities  
Net cash used in investing activities (1,274,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (197,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
CASH FLOWS FROM FINANCING ACTIVITIES    
Deferred IPO cost   (218,000)us-gaap_PaymentsOfStockIssuanceCosts
Payment of tax withholdings on net issuance of common stock for compensation (31,000)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation  
Net cash used in financing activities (31,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (218,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
NET DECREASE IN CASH (2,878,000)us-gaap_NetCashProvidedByUsedInContinuingOperations (1,224,000)us-gaap_NetCashProvidedByUsedInContinuingOperations
CASH - Beginning of period 5,803,000us-gaap_CashAndCashEquivalentsAtCarryingValue 3,339,000us-gaap_CashAndCashEquivalentsAtCarryingValue
CASH - End of period 2,925,000us-gaap_CashAndCashEquivalentsAtCarryingValue 2,115,000us-gaap_CashAndCashEquivalentsAtCarryingValue
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION    
Taxes   $ 1,000us-gaap_IncomeTaxesPaid