Cash velocity percentage.

No definition available.

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

- Definition

Cash velocity percentage other.

+ References

No definition available.

+ Details

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

- Definition

Increased facility cap.

+ References

No definition available.

+ Details

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

- Definition

Line of credit facility commitment fee percentage if revolver terminated one year before amendment date.

+ References

No definition available.

+ Details

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

- Definition

Line of credit facility commitment fee percentage if revolver terminated two years after amendment date.

+ References

No definition available.

+ Details

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

- Definition

Line of credit facility commitment fee percentage if revolver terminated two years before amendment date.

+ References

No definition available.

+ Details

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

- Definition

Line Of Credit Facility Termination Fee

+ References

No definition available.

+ Details

Name:	neo_LineOfCreditFacilityTerminationFee
Namespace Prefix:	neo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Minimum termination fee grace period.

+ References

No definition available.

+ Details

Name:	neo_MinimumTerminationFeeGracePeriod
Namespace Prefix:	neo_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- 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

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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

- Definition

Amount of the fee for available but unused credit capacity under the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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

- 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

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Details

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

- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph f

-Article 4

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

+ Details

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

- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

+ Details

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

- Details

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

- Details

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

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Revolving Credit and Security Agreement - Additional Information (Detail) (USD $)	0 Months Ended				12 Months Ended	0 Months Ended	3 Months Ended	0 Months Ended
	Aug. 26, 2014	Jun. 24, 2014	Jan. 25, 2013	Mar. 26, 2012	Dec. 31, 2014	Jan. 31, 2013	Mar. 31, 2013	Jan. 24, 2014
Line of Credit Facility [Line Items]
Amended and Restated Credit Agreement maturity date				Mar. 26, 2015
Minimum termination fee, percentage at any time before March 26, 2013				2.50%
Minimum termination fee, percentage after March 26, 2013 but before March 26, 2014				1.50%
Minimum termination fee, percentage on or after March 26, 2014				0.50%
Minimum termination fee, grace period				5 days
Debt Instrument, Basis Spread on Variable Rate				2.00%
Debt Instrument, Description of Variable Rate Basis					"The LIBOR shall be not less than 2.0%" and replacing it with "the LIBOR shall be not less than 1.0%"
Commitment fee for capital source		$ 5,000	$ 10,000	$ 80,000
Termination fee of credit facility	61,000neo_LineOfCreditFacilityTerminationFee
Unamortized debt issuance costs	37,000us-gaap_UnamortizedDebtIssuanceExpense
Maximum [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity				8,000,000
Increase in line of credit facility cap				10,000,000		12,000,000
Increased facility cap			10,000,000
Cash Velocity Percentage			87.50%
Minimum [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity				5,000,000
Increase in line of credit facility cap			1,000,000	1,000,000
Increased facility cap			$ 9,000,000
Cash Velocity Percentage							80.00%
Amended and Restated Credit Arrangement [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate				1.00%
Third Amended and Restated Credit Agreement [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Cash velocity percentage other								87.50%
Third Amended and Restated Credit Agreement [Member] \| Revolving Credit Facility [Member] \| Effective from December 1, 2013 to March 31, 2014 [Member]
Line of Credit Facility [Line Items]
Cash Velocity Percentage								80.00%
Third Amended and Restated Credit Agreement [Member] \| Revolving Credit Facility [Member] \| Effective from December 31, 2012 to March 31, 2013 [Member]
Line of Credit Facility [Line Items]
Cash Velocity Percentage								75.00%