Fair Value Measurements - Schedule of Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) $ in Thousands	3 Months Ended
Mar. 31, 2017 USD ($)
Beginning Balance	$ 7,514
Initial Liability	208
Payments	(25)
Accretion	41
Cancellation of Obligation / Conversions	(6,168)
Mark to Market	42
Ending Balance	1,612
Asuragen [Member]
Beginning Balance	1,545
Initial Liability
Payments	(25)
Accretion	41
Cancellation of Obligation / Conversions
Mark to Market
Ending Balance	1,561
RedPath [Member]
Beginning Balance	5,969
Initial Liability
Payments
Accretion
Cancellation of Obligation / Conversions	(5,969)
Mark to Market
Ending Balance
Embedded Conversion Option [Member]
Beginning Balance
Initial Liability	208
Payments
Accretion
Cancellation of Obligation / Conversions	(199)
Mark to Market	42
Ending Balance	$ 51

Cancellation of Obligation / Conversions.

No definition available.

Name:	IDXG_CancellationOfObligationConversions
Namespace Prefix:	IDXG_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of accretion of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

No definition available.

+ Details

Name:	IDXG_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityAccretion
Namespace Prefix:	IDXG_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Initial Liability.

+ References

No definition available.

+ Details

Name:	IDXG_InitialLiability
Namespace Prefix:	IDXG_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Mark to Market.

+ References

No definition available.

+ Details

Name:	IDXG_MarkToMarket
Namespace Prefix:	IDXG_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

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

- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

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

- Details

Name:	dei_LegalEntityAxis=IDXG_AsuragenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=IDXG_RedPathMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=IDXG_EmbeddedConversionOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: