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Condensed Consolidated Statements of Stockholders' Equity (USD $)
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Total
Balance at Dec. 31, 2014 $ 7,000us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 35,880,000us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ (21,197,000)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 14,690,000us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2014 6,931,984us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
    6,931,984us-gaap_CommonStockSharesOutstanding
Increase (Decrease) in Stockholders' Equity        
Issuance of common stock for compensation (in shares) 18,108us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Stock-based compensation   440,000us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
  440,000us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Exercise of warrants, cashless (in shares) 208,184resn_StockIssuedDuringPeriodSharesWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
    208,184resn_StockIssuedDuringPeriodSharesWarrantsExercised
Tax withholding on net exercise of stock-based awards   (31,000)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
  (31,000)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
Net loss     (2,228,000)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(2,228,000)us-gaap_NetIncomeLoss
Balance at Mar. 31, 2015 $ 7,000us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 36,289,000us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ (23,425,000)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 12,871,000us-gaap_StockholdersEquity
Balance (in shares) at Mar. 31, 2015 7,158,276us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
    7,158,276us-gaap_CommonStockSharesOutstanding