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Debt (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Short-term Debt [Line Items]    
Total Debt $ 2,462,528us-gaap_LongTermDebt $ 1,380,270us-gaap_LongTermDebt
Less short-term portion 2,462,528us-gaap_LongTermDebtCurrent 1,276,358us-gaap_LongTermDebtCurrent
Long-term portion 0us-gaap_LongTermDebtNoncurrent 103,912us-gaap_LongTermDebtNoncurrent
8% Convertible Promissory Note Maturing In May 2004    
Short-term Debt [Line Items]    
Total Debt 30,000us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_EightConvertiblePromissoryNoteMaturingInMayTwoThousandAndFourMember
30,000us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_EightConvertiblePromissoryNoteMaturingInMayTwoThousandAndFourMember
12% One demand loans    
Short-term Debt [Line Items]    
Total Debt 0us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_DemandLoansMember
10,000us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_DemandLoansMember
10% Promisssory Note Maturing In November 30, 2006 and January 31, 2007    
Short-term Debt [Line Items]    
Total Debt 48,000us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_TenPercentagePromisssoryNoteMaturingInNovemberThirtyTwousandSixAndJanuaryThirtyOneTwoThousandAndSevenMember
48,000us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_TenPercentagePromisssoryNoteMaturingInNovemberThirtyTwousandSixAndJanuaryThirtyOneTwoThousandAndSevenMember
10% Promisssory Note Maturing In January 2007    
Short-term Debt [Line Items]    
Total Debt 44,000us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_TenPercentagePromisssoryNoteMaturingInJanuaryTwoHousandAndSevenMember
44,000us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_TenPercentagePromisssoryNoteMaturingInJanuaryTwoHousandAndSevenMember
10% Promisssory Note Maturing In March 2007    
Short-term Debt [Line Items]    
Total Debt 75,000us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_TenPercentPromisssoryNoteMaturingInMarchTwoThousandAndSevenMember
75,000us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_TenPercentPromisssoryNoteMaturingInMarchTwoThousandAndSevenMember
10% Promisssory Note Maturing In September 30, 2007    
Short-term Debt [Line Items]    
Total Debt 25,000us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_TenPercentagePromissoryNoteMaturingOnSeptemberThirtyTwoThousandAndSevenMember
25,000us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_TenPercentagePromissoryNoteMaturingOnSeptemberThirtyTwoThousandAndSevenMember
10% Promisssory Note due on July 31, 2008    
Short-term Debt [Line Items]    
Total Debt 400,000us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_TenPercentPromisssoryNoteMaturingInJulyThirtyOneThousandAndEightMember
400,000us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_TenPercentPromisssoryNoteMaturingInJulyThirtyOneThousandAndEightMember
2% Promissory Note Issued In November    
Short-term Debt [Line Items]    
Total Debt 0us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_TwoPercentagePromissoryNoteIssuedInNovemberMember
85,726us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_TwoPercentagePromissoryNoteIssuedInNovemberMember
10% Senior Secured Convertible Notes In September 2011    
Short-term Debt [Line Items]    
Total Debt 29,606us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_TenPercentSeniorSecuredConvertibleNotesInSeptemberThousandAndElevenMember
29,606us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_TenPercentSeniorSecuredConvertibleNotesInSeptemberThousandAndElevenMember
10% Promissory notes Issued In March and April 2012    
Short-term Debt [Line Items]    
Total Debt 70,139us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_TenPercentPromissoryNotesIssuedInMarchAndAprilTwoThousandAndTwelveMember
74,306us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_TenPercentPromissoryNotesIssuedInMarchAndAprilTwoThousandAndTwelveMember
15% Promissory Note Issued In March 2013    
Short-term Debt [Line Items]    
Total Debt 112,288us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_FifteenPercentPromissoryNotesIssuedInMarchTwoThousandAndThirteenMember
97,924us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_FifteenPercentPromissoryNotesIssuedInMarchTwoThousandAndThirteenMember
15% Promissory Note Issued In April, May and June 2013    
Short-term Debt [Line Items]    
Total Debt 0us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_FifteenPercentPromissoryNotesIssuedInAprilMayAndJuneTwoThousandAndThirteenMember
191,551us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_FifteenPercentPromissoryNotesIssuedInAprilMayAndJuneTwoThousandAndThirteenMember
15% Promissory Notes Issuance One In May 2013    
Short-term Debt [Line Items]    
Total Debt 0us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_FifteenPercentPromissoryNotesIssuanceOneInMayTwoThousandAndThirteenMember
96,012us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_FifteenPercentPromissoryNotesIssuanceOneInMayTwoThousandAndThirteenMember
15% Promissory Note Issuance Two In May 2013    
Short-term Debt [Line Items]    
Total Debt 0us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_FifteenPercentPromissoryNotesIssuanceTwoInMayTwoThousandAndThirteenMember
95,948us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_FifteenPercentPromissoryNotesIssuanceTwoInMayTwoThousandAndThirteenMember
10% Promissory Notes Re Issuance In August 2013    
Short-term Debt [Line Items]    
Total Debt 0us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_TenPercentPromissoryNotesReissuanceInAugustTwoThousandAndThirteenMember
53,000us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_TenPercentPromissoryNotesReissuanceInAugustTwoThousandAndThirteenMember
15% Promissory Notes Issuance In August 2013    
Short-term Debt [Line Items]    
Total Debt 26,521us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_FifteenPercentPromissoryNotesIssuanceInAugustTwoThousandAndThirteenMember
24,197us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_FifteenPercentPromissoryNotesIssuanceInAugustTwoThousandAndThirteenMember
15% Promissory notes Issued In March and April 2014    
Short-term Debt [Line Items]    
Total Debt 269,368us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_FifteenPercentPromissoryNotesIssuedInMarchAndAprilTwoThousandFourteenMember
0us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_FifteenPercentPromissoryNotesIssuedInMarchAndAprilTwoThousandFourteenMember
12% Promissory notes Issued In May 2014    
Short-term Debt [Line Items]    
Total Debt 439,052us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_TwelvePercentPromissoryNotesIssuedInMayTwoThousandFourteenMember
0us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_TwelvePercentPromissoryNotesIssuedInMayTwoThousandFourteenMember
12% Promissory notes Issued In July 2014    
Short-term Debt [Line Items]    
Total Debt 507,425us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_TwelvePercentPromissoryNotesIssuedInJulyTwoThousandFourteenMember
0us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_TwelvePercentPromissoryNotesIssuedInJulyTwoThousandFourteenMember
12% Promissory Note Issuance One In October 2014    
Short-term Debt [Line Items]    
Total Debt 19,863us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_TwelvePercentPromissoryNotesIssuanceOneInOctoberTwoThousandFourteenMember
0us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_TwelvePercentPromissoryNotesIssuanceOneInOctoberTwoThousandFourteenMember
4% Promissory notes Issued In October 2014    
Short-term Debt [Line Items]    
Total Debt 40,685us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_FourPercentPromissoryNotesIssuedInOctoberTwoThousandFourteenMember
0us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_FourPercentPromissoryNotesIssuedInOctoberTwoThousandFourteenMember
12% Promissory Note Issuance Two In October 2014    
Short-term Debt [Line Items]    
Total Debt 65,526us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_TwelvePercentPromissoryNotesIssuanceTwoInOctoberTwoThousandFourteenMember
0us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_TwelvePercentPromissoryNotesIssuanceTwoInOctoberTwoThousandFourteenMember
12% Promissory Note Issuance Three In October 2014    
Short-term Debt [Line Items]    
Total Debt 35,055us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_TwelvePercentPromissoryNotesIssuanceThreeInOctoberTwoThousandFourteenMember
0us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_TwelvePercentPromissoryNotesIssuanceThreeInOctoberTwoThousandFourteenMember
24% Promissory notes Issued In December 2014    
Short-term Debt [Line Items]    
Total Debt $ 225,000us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_TwentyFourPercentPromissoryNotesIssuedInDecemberTwoThousandFourteenMember
$ 0us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_TwentyFourPercentPromissoryNotesIssuedInDecemberTwoThousandFourteenMember