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Acquisitions - Summary of Unaudited Pro-forma Information (Detail) (Path Logic [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Path Logic [Member]
 
Business Acquisition [Line Items]  
Revenue $ 20,529us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= neo_PathLogicMember
Net (loss) $ (566)us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= neo_PathLogicMember
(Loss) per share  
Basic $ (0.01)us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
/ us-gaap_BusinessAcquisitionAxis
= neo_PathLogicMember
Diluted $ (0.01)us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
/ us-gaap_BusinessAcquisitionAxis
= neo_PathLogicMember