Defined Contribution Plans (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Retirement Benefits [Abstract]
Employer matching contribution, percent of employees' gross pay (as a percent)			100.00%
Maximum annual contributions per employee (as a percent)			3.00%
Employer matching contribution, percent of match (as a percent)			50.00%
Maximum additional contribution upon employee (as a percent)			2.00%
Additional maximum contribution per employee (as a percent)			4.00%
Amount of matching contributions	$ 1.5	$ 1.2	$ 3.1	$ 2.6

Defined Contribution Plan, Additional Maximum Annual Contributions Per Employee, Percent

No definition available.

Name:	neo_DefinedContributionPlanAdditionalMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix:	neo_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Defined Contribution Plan, Employer Matching Additional Contribution Upon Employee, Percent

No definition available.

Name:	neo_DefinedContributionPlanEmployerMatchingAdditionalContributionUponEmployeePercent
Namespace Prefix:	neo_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

No definition available.

Name:	us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of discretionary contributions made by an employer to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Percentage employer matches of the employee's percentage contribution matched.

No definition available.

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration