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Acquisitions - Estimated Amortization Expense (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]    
Remainder of 2015 $ 278us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear  
2016 371us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
2017 371us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2018 371us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2019 371us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2020 371us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Thereafter 1,986us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Total 4,119us-gaap_FiniteLivedIntangibleAssetsNet 4,212us-gaap_FiniteLivedIntangibleAssetsNet
Path Logic [Member]    
Finite-Lived Intangible Assets [Line Items]    
Remainder of 2015 111us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
/ us-gaap_BusinessAcquisitionAxis
= neo_PathLogicMember
 
2016 148us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
/ us-gaap_BusinessAcquisitionAxis
= neo_PathLogicMember
 
2017 148us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_BusinessAcquisitionAxis
= neo_PathLogicMember
 
2018 148us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_BusinessAcquisitionAxis
= neo_PathLogicMember
 
2019 148us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
/ us-gaap_BusinessAcquisitionAxis
= neo_PathLogicMember
 
2020 148us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
/ us-gaap_BusinessAcquisitionAxis
= neo_PathLogicMember
 
Thereafter 971us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
/ us-gaap_BusinessAcquisitionAxis
= neo_PathLogicMember
 
Total $ 1,822us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_BusinessAcquisitionAxis
= neo_PathLogicMember