Debt Instrument, Discount On Principal Amount, Percentage

No definition available.

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

- Definition

Debt Instrument, Optional Additional Face Amount

+ References

No definition available.

+ Details

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

- Definition

Sale of Stock, Premium On Offering Price

+ References

No definition available.

+ Details

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

- Definition

Sale of Stock, Price Per Share, Public Offering Price

+ References

No definition available.

+ Details

Name:	neo_SaleOfStockPricePerSharePublicOfferingPrice
Namespace Prefix:	neo_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Sale Of Stock, Underwriting Discounts and Commissions Per Share

+ References

No definition available.

+ Details

Name:	neo_SaleOfStockUnderwritingDiscountsAndCommissionsPerShare
Namespace Prefix:	neo_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Face amount or stated value per share of common stock.

+ 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(29))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_CommonStockParOrStatedValuePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

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

- Definition

Contractual interest rate for funds borrowed, under the debt 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(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

- 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

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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

- Definition

The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

+ Details

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

- Definition

Cash received on stock transaction after deduction of issuance costs.

+ References

No definition available.

+ Details

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

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=neo_StrategicAllianceWithInivataLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=srt_AffiliatedEntityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=neo_CommonStockOfferingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_OverAllotmentOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=neo_ConvertibleSeniorNotesDue2028Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=neo_CappedCallTransactionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Subsequent Events (Details) - USD ($)				1 Months Ended	12 Months Ended
Subsequent Events (Details) - USD ($)	Jan. 06, 2021	Jun. 03, 2020	Apr. 29, 2020	May 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 11, 2021	May 22, 2020
Subsequent Event [Line Items]
Number of shares issued in transaction				8,100,000
Common stock, par value (in dollars per share)					$ 0.001	$ 0.001
Sale of stock, price per share (in dollars per share)				$ 21.25
Sale of stock, consideration received				$ 160,800,000
Proceeds from issuance of convertible debt, net of issuance costs					$ 194,466,000	$ 0	$ 0
Strategic Alliance With Inivata Limited \| Affiliated Entity
Subsequent Event [Line Items]
Stated interest rate (as a percent)									0.00%
Line of credit facility maximum borrowing capacity									$ 15,000,000
Common Stock Offering
Subsequent Event [Line Items]
Number of shares issued in transaction			4,400,000
Common stock, par value (in dollars per share)			$ 0.001
Sale of stock, price per share (in dollars per share)			$ 28.50
Sale of stock, consideration received			$ 117,900,000
Over-Allotment Option
Subsequent Event [Line Items]
Number of shares issued in transaction		351,500	660,000
Sale of stock, consideration received		$ 9,400,000
Subsequent Event \| Convertible Senior Notes Due 2028
Subsequent Event [Line Items]
Stated interest rate (as a percent)	0.25%
Debt instrument, face amount	$ 300,000,000
Optional additional face amount	$ 45,000,000
Discount on principal (as a percent)	97.00%
Proceeds from issuance of convertible debt, net of issuance costs	$ 334,500,000
Subsequent Event \| Common Stock Offering
Subsequent Event [Line Items]
Number of shares issued in transaction	4,081,632
Common stock, par value (in dollars per share)	$ 0.001
Sale of stock, price per share (in dollars per share)	49.00
Underwriting discounts and commissions (in dollars per share)	$ 2.45
Sale of stock, consideration received	$ 218,300,000
Subsequent Event \| Over-Allotment Option
Subsequent Event [Line Items]
Number of shares issued in transaction	612,244
Subsequent Event \| Capped Call Transactions
Subsequent Event [Line Items]
Sale of stock, price per share (in dollars per share)								$ 85.75
Proceeds from issuance of convertible debt, net of issuance costs	$ 29,300,000
Premium on offering price (as a percent)								75.00%
Public offering price (in dollars per share)								$ 49.00