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Investments and Outstanding Note - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Jul. 31, 2014
Schedule of Investments [Line Items]      
Certificates of deposit   $ 30,000us-gaap_CertificatesOfDepositAtCarryingValue  
Investment amount outstanding 0nanx_AmountOfInvestmentOutstanding    
Investment related liability 0us-gaap_InvestmentRelatedLiabilities    
Letter of Credit [Member]      
Schedule of Investments [Line Items]      
Letter of credit and related promissory note     30,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_LetterOfCreditMember
Borrowings incurred $ 0us-gaap_InterestExpenseBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_LetterOfCreditMember
   
Interest rate 1.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_LetterOfCreditMember