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

X

- Definition

The amount of accrued offering costs during the period.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Gross proceeds from the issuance of common stock and warrants.

+ References

No definition available.

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X

- Definition

Total Offering cost for issuance of common stock and warrants.

+ References

No definition available.

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Namespace Prefix:	rtgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Value of offering cost withheld from the proceeds.

+ References

No definition available.

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Namespace Prefix:	rtgn_
Data Type:	xbrli:monetaryItemType
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X

- 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

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