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Stockholders' Equity (Details Textual) (USD $)	1 Months Ended		12 Months Ended		0 Months Ended	1 Months Ended	0 Months Ended
Stockholders' Equity (Details Textual) (USD $)	Mar. 26, 2014	Sep. 25, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 12, 2015	Mar. 21, 2014	May 11, 2014	May 12, 2014	Oct. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 4.79	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value			$ 1,593,000
Allocated Share-based Compensation Expense			452,000	0
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized			1,060,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			2 years 1 month 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			332,500
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price			$ 6.37
Stockholders' Equity, Reverse Stock Split		1-for-2.5
Common Stock, Par or Stated Value Per Share		$ 0.0001	$ 0.0001	$ 0.0001
Common Stock, Shares, Outstanding		5,000,000us-gaap_CommonStockSharesOutstanding	4,650,000us-gaap_CommonStockSharesOutstanding	4,650,000us-gaap_CommonStockSharesOutstanding
Stock Issued During Period, Shares, Reverse Stock Splits		2,000,000
Common Stock, Shares Authorized			100,000,000us-gaap_CommonStockSharesAuthorized	100,000,000us-gaap_CommonStockSharesAuthorized
Preferred Stock, Shares Authorized			500,000us-gaap_PreferredStockSharesAuthorized	500,000us-gaap_PreferredStockSharesAuthorized
Preferred Stock, Par or Stated Value Per Share			$ 0.0001	$ 0.0001
Gross Proceeds From Issuance Of Common Stock And Warrants			1,117,000	19,216,000
Offering Cost			252,000rtgn_OfferingCost	3,195,000rtgn_OfferingCost
Common Stock, Shares, Issued			4,804,290us-gaap_CommonStockSharesIssued	4,804,290us-gaap_CommonStockSharesIssued
Share Based Compensation Arrangement By Share Based Payment Award Equity Instrument Other Than Options Equity Instruments Exercisable Number			3,140,250
Investment Warrants, Exercise Price	$ 0.0001invest_InvestmentWarrantsExercisePrice
Closing Price Of Common Stock Percentage	150.00%
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number			3,145,650
Class Of Warrant Or Right Duration From Which Warrants Or Rights Exercisable			1 year
Investment From Former Parent				1,679,000rtgn_InvestmentFromFormerParent
Percentage Of Options Unvested			0.00%rtgn_PercentageOfOptionsUnvested
Representative Of Underwriters [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term Of Warrant			5 years
Stock Issued During Period, Shares, Other			5,400
Shares Issued, Price Per Share			$ 9.0625
New 2013 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Description					The annual increase in the number of shares shall be equal to the lowest of: (i) 2,551,500 shares of Ruthigen’s common stock; (ii) five percent (5%) of the number of shares of Ruthigen’s common stock outstanding as of such date; and (iii) an amount determined by Ruthigen’s board of directors.
Stock Issued During Period, Shares, New Issues					6,853,319
Stock Issued During Period, Shares, Period Increase (Decrease)					1,230,855
IPO [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Price						$ 6.6608
Warrants to Purchase of Common Stock	397,500					397,500
Initial Public Offering Price Per Unit	$ 7.25					$ 7.25
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 9.0625
Initial Public Offering Units	2,650,000					2,650,000
Proceeds from Issuance of Common Stock	16,021,000
Gross Proceeds From Issuance Of Common Stock And Warrants	19,216,000
Offering Cost	3,195,000
Common Stock, Shares, Issued	2,650,000
Share Based Compensation Arrangement By Share Based Payment Award Equity Instrument Other Than Options Equity Instruments Exercisable Number	3,047,500
Share Based Compensation Arrangement By Share Based Payment Award Equity Instrument Other Than Options Equity Instruments Exercisable Weighted Average Exercise Price	$ 7.25
Over-Allotment Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of Stock, Number of Shares Issued in Transaction			154,290
Sale of Stock, Price Per Share			$ 6.6608
Sale of Stock, Consideration Received on Transaction			1,028,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense			627,000	0
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized			1,522,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			2 years 1 month 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights			RSUs for 341,000 shares of common stock vest ratably over three years on a quarterly basis and had an aggregate grant date value of $2,148,000. RSUs for 68,355 shares had an aggregate grant date value of $431,000 and vest in equal installments based on achievement of the following: (1) enrollment of the first patient in the first pivotal clinical trial for RUT58-60 on or prior to May 11, 2017; (2) enrollment of the first patient in the second pivotal clinical trial for RUT58-60 on or prior to May 11, 2018; and (3) completion of the clinical study report containing the results of the second pivotal clinical trial for RUT58-60 on or prior to May 11, 2019.
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period							409,355
Restricted Stock Units (RSUs) [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense			431,000
2013 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross								332,500
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price								$ 6.37
Class of Warrant or Right, Exercise Price of Warrants or Rights						$ 0.0092
Common Stock, Shares Authorized									998,355
Share-based Compensation Arrangement by Share-based Payment Award, Description			The annual increase in the number of shares shall be equal to the lowest of: (a) 232,500 shares of the Company’s common stock; (b) 5% of the number of shares of the Company’s common stock outstanding as of such date; and (c) an amount determined by the Company’s board of directors or compensation committee.
Underwriters [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 9.0625
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	92,750
Class of Warrant or Right, Date from which Warrants or Rights Exercisable	Mar. 21, 2015
Class Of Warrant Or Rights Expiring Date Warrants Or Rights Exercisable	Mar. 21, 2019
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period						397,500
Investment From Former Parent				$ 0