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Stockholders' Equity (Details 4) (USD $)
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options Outstanding Exercise Price $ 6.37us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Options Outstanding Number of Options 315,836us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options Exercisable Weighted Average Remaining Life 8 years 8 months 12 days  
Options Exercisable Number of Options 81,522us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber  
Exercise Price [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options Outstanding Exercise Price $ 6.37us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rtgn_ExercisePriceMember
 
Options Outstanding Number of Options 315,836us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rtgn_ExercisePriceMember
 
Options Exercisable Weighted Average Remaining Life 8 years 8 months 12 days  
Options Exercisable Number of Options 81,522us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= rtgn_ExercisePriceMember