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DEBT - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2014
Debt Instrument [Line Items]    
Long-term Debt $ 1,380,270us-gaap_LongTermDebt $ 2,462,528us-gaap_LongTermDebt
Debt Instrument, Unamortized Discount 70,062us-gaap_DebtInstrumentUnamortizedDiscount 1,047,888us-gaap_DebtInstrumentUnamortizedDiscount
Debt Instrument, Fair Value Disclosure   1,096,487us-gaap_DebtInstrumentFairValue
Convertible Debt, Fair Value Disclosures   358,641us-gaap_ConvertibleDebtFairValueDisclosures
Debt Instrument, Convertible, Conversion Price   $ 0.20us-gaap_DebtInstrumentConvertibleConversionPrice1
Unit Notes [Member]    
Debt Instrument [Line Items]    
Notes Payable, Total 1,455,128us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= nrti_UnitNotesMember
 
Promissory Note    
Debt Instrument [Line Items]    
Long-term Debt 4,269,250us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_PromissoryNoteMember
3,829,075us-gaap_LongTermDebt
/ us-gaap_ShortTermDebtTypeAxis
= nrti_PromissoryNoteMember
Debt Instrument, Unamortized Discount 82,560us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_ShortTermDebtTypeAxis
= nrti_PromissoryNoteMember
0us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_ShortTermDebtTypeAxis
= nrti_PromissoryNoteMember
Promissory Note | Investor Group [Member]    
Debt Instrument [Line Items]    
Other Nonoperating Gains (Losses) $ 358,641us-gaap_OtherNonoperatingGainsLosses
/ us-gaap_RelatedPartyTransactionAxis
= nrti_InvestorGroupMember
/ us-gaap_ShortTermDebtTypeAxis
= nrti_PromissoryNoteMember