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Condensed Consolidated Statements of Operations (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
OPERATING EXPENSES    
Research and development expenses $ 997,000us-gaap_ResearchAndDevelopmentExpense $ 435,000us-gaap_ResearchAndDevelopmentExpense
General and administrative expenses 1,127,000us-gaap_GeneralAndAdministrativeExpense 522,000us-gaap_GeneralAndAdministrativeExpense
Depreciation and amortization 111,000us-gaap_DepreciationAndAmortization 13,000us-gaap_DepreciationAndAmortization
TOTAL OPERATING EXPENSES 2,235,000us-gaap_OperatingExpenses 970,000us-gaap_OperatingExpenses
OPERATING LOSS (2,235,000)us-gaap_OperatingIncomeLoss (970,000)us-gaap_OperatingIncomeLoss
OTHER INCOME (EXPENSE)    
Interest and investment income 8,000us-gaap_InvestmentIncomeInterest  
Interest expense   (709,000)us-gaap_InterestExpense
Fair value adjustments to warrant and derivative liabilities   (2,267,000)resn_FairValueAdjustmentOfWarrantsAndDerivative
TOTAL OTHER INCOME (EXPENSE) 8,000us-gaap_NonoperatingIncomeExpense (2,976,000)us-gaap_NonoperatingIncomeExpense
LOSS BEFORE INCOME TAXES (2,227,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (3,946,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision for income taxes (1,000)us-gaap_IncomeTaxExpenseBenefit (1,000)us-gaap_IncomeTaxExpenseBenefit
NET LOSS $ (2,228,000)us-gaap_NetIncomeLoss $ (3,947,000)us-gaap_NetIncomeLoss
NET LOSS PER SHARE - BASIC AND DILUTED (in dollars per share) $ (0.31)us-gaap_EarningsPerShareBasicAndDiluted $ (3.95)us-gaap_EarningsPerShareBasicAndDiluted
Weighted average shares outstanding-basic and diluted (in shares) 7,077,789us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 999,999us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted