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Stock Options, Stock Purchase Plan and Warrants - Summarizes Information on Warrants Outstanding (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number outstanding 650,000us-gaap_ClassOfWarrantOrRightOutstanding
Exercise price $ 1.48us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Warrant One [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number outstanding 450,000us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= neo_WarrantOneMember
Exercise price $ 1.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= neo_WarrantOneMember
Issued May 03, 2010
Expire May 02, 2017
Warrants Two [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number outstanding 200,000us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= neo_WarrantsTwoMember
Exercise price $ 1.43us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= neo_WarrantsTwoMember
Issued Jan. 12, 2012
Expire Jan. 12, 2017