Debt instrument applicable margin rate.

No definition available.

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Balance Type:	na
Period Type:	duration

- Definition

Debt instrument percentage of net cash proceeds from issuances or incurrence of additional debt to be used for mandatory prepayment.

+ References

No definition available.

+ Details

Name:	neo_DebtInstrumentPercentageOfNetCashProceedsFromIssuancesOrIncurrenceOfAdditionalDebtToBeUsedForMandatoryPrepayment
Namespace Prefix:	neo_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt instrument percentage of net cash proceeds from sales and dispositions subject to certain reinvestment rights.

+ References

No definition available.

+ Details

Name:	neo_DebtInstrumentPercentageOfNetCashProceedsFromSalesAndDispositionsSubjectToCertainReinvestmentRights
Namespace Prefix:	neo_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line Of Credit Facility, Annual Principal Amortization, After Year Four

+ References

No definition available.

+ Details

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Namespace Prefix:	neo_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line Of Credit Facility, Annual Principal Amortization, Year Four

+ References

No definition available.

+ Details

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Namespace Prefix:	neo_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line Of Credit Facility, Annual Principal Amortization, Year One

+ References

No definition available.

+ Details

Name:	neo_LineOfCreditFacilityAnnualPrincipalAmortizationYearOne
Namespace Prefix:	neo_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line Of Credit Facility, Annual Principal Amortization, Year Three

+ References

No definition available.

+ Details

Name:	neo_LineOfCreditFacilityAnnualPrincipalAmortizationYearThree
Namespace Prefix:	neo_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line Of Credit Facility, Annual Principal Amortization, Year Two

+ References

No definition available.

+ Details

Name:	neo_LineOfCreditFacilityAnnualPrincipalAmortizationYearTwo
Namespace Prefix:	neo_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of credit facility swingline sublimit.

+ References

No definition available.

+ Details

Name:	neo_LineOfCreditFacilitySwinglineSublimit
Namespace Prefix:	neo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

+ Details

Name:	us-gaap_DeferredFinanceCostsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1336-112600

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1314-112600

+ Details

Name:	us-gaap_LongTermLineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentAxis=neo_NewCreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=neo_FederalFundsRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
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Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
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- Details

Name:	srt_RangeAxis=srt_MaximumMember
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Balance Type:
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- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=neo_TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=neo_DelayedDrawTermLoanMember
Namespace Prefix:
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Period Type:

Debt - Narrative (Detail) - USD ($)		3 Months Ended
Debt - Narrative (Detail) - USD ($)	Jun. 27, 2019	Mar. 31, 2020	Dec. 31, 2019
Line of Credit Facility [Line Items]
Debt issuance costs		$ (645,000)	$ (671,000)
Debt instrument, weighted average interest rates		4.82%	4.64%
New Credit Agreement \| Federal Funds Rate
Line of Credit Facility [Line Items]
Debt instrument variable interest rate		0.50%
New Credit Agreement \| LIBOR
Line of Credit Facility [Line Items]
Debt instrument variable interest rate		1.00%
New Credit Agreement \| LIBOR \| Minimum
Line of Credit Facility [Line Items]
Debt instrument applicable margin		1.25%
New Credit Agreement \| LIBOR \| Maximum
Line of Credit Facility [Line Items]
Debt instrument applicable margin		2.25%
New Credit Agreement \| Base Rate \| Minimum
Line of Credit Facility [Line Items]
Debt instrument applicable margin		0.25%
New Credit Agreement \| Base Rate \| Maximum
Line of Credit Facility [Line Items]
Debt instrument applicable margin		1.25%
New Credit Agreement \| Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity	$ 100,000,000.0
Line of credit facility, swingline sublimit	$ 10,000,000.0
New Credit Agreement \| Revolving Credit Facility \| Minimum
Line of Credit Facility [Line Items]
Commitment fee (as a percent)	0.15%
New Credit Agreement \| Revolving Credit Facility \| Maximum
Line of Credit Facility [Line Items]
Commitment fee (as a percent)	0.35%
New Credit Agreement \| Term Loan
Line of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity	$ 100,000,000.0
Annual principal amortization, year one (as a percent)	5.00%
Annual principal amortization, year two (as a percent)	5.00%
Annual principal amortization, year three (as a percent)	7.50%
Annual principal amortization, year four (as a percent)	7.50%
Annual principal amortization, thereafter (as a percent)	10.00%
Line of credit facility, outstanding borrowings		$ 5,000,000.0
Long-term outstanding borrowings		90,600,000
Debt issuance costs		$ (600,000)
Debt instrument, percentage of net cash proceeds from sales and dispositions subject to certain reinvestment rights		100.00%
Debt instrument, percentage of net cash proceeds from issuances or incurrence of additional debt to be used for mandatory prepayment		100.00%
New Credit Agreement \| Delayed Draw Term Loan
Line of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity	$ 50,000,000.0