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CONSOLIDATED STATEMENTS OF CASH FLOWS [Parenthetical] (USD $) | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Gross Proceeds From Issuance Of Common Stock And Warrants | $ 1,117,000 rtgn_GrossProceedsFromIssuanceOfCommonStockAndWarrants | $ 19,216,000 rtgn_GrossProceedsFromIssuanceOfCommonStockAndWarrants |
Offering Cost | 252,000 rtgn_OfferingCost | 3,195,000 rtgn_OfferingCost |
Offering Cost Withheld From The Proceeds | 89,000 rtgn_OfferingCostWithheldFromProceeds | 2,826,000 rtgn_OfferingCostWithheldFromProceeds |
Payments of Stock Issuance Costs | 163,000 us-gaap_PaymentsOfStockIssuanceCosts | 206,000 us-gaap_PaymentsOfStockIssuanceCosts | 44,000 us-gaap_PaymentsOfStockIssuanceCosts
Accrued Offering Costs |  | $ 163,000 rtgn_AccruedOfferingCosts |

X
- Definition The amount of accrued offering costs during the period. + References No definition available. + Details
Name: | rtgn_AccruedOfferingCosts
Namespace Prefix: | rtgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Gross proceeds from the issuance of common stock and warrants. + References No definition available. + Details
Name: | rtgn_GrossProceedsFromIssuanceOfCommonStockAndWarrants
Namespace Prefix: | rtgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Total Offering cost for issuance of common stock and warrants. + References No definition available. + Details
Name: | rtgn_OfferingCost
Namespace Prefix: | rtgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Value of offering cost withheld from the proceeds. + References No definition available. + Details
Name: | rtgn_OfferingCostWithheldFromProceeds
Namespace Prefix: | rtgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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Namespace Prefix: | us-gaap_
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