Note 4 - Identifiable Intangible Assets Carrying Value (Details) $ in Thousands	3 Months Ended
Mar. 31, 2016 USD ($)
Diagnostic Test, Thyroid [Member] \| Asuragen [Member]
Finite-lived intangible asset, useful life	9 years
Finite-Lived Intangible Assets, Net	$ 8,519
Diagnostic Test, Pancreas [Member] \| Asuragen [Member]
Finite-lived intangible asset, useful life	7 years
Finite-Lived Intangible Assets, Net	$ 2,882
Diagnostic Test, Pancreas [Member] \| RedPath [Member]
Finite-lived intangible asset, useful life	7 years
Finite-Lived Intangible Assets, Net	$ 16,141
Diagnostic Test, Biobank [Member] \| Asuragen [Member]
Finite-lived intangible asset, useful life	4 years
Finite-Lived Intangible Assets, Net	$ 1,575
Diagnostic Test, Barrett's RedPath [Member] \| RedPath [Member]
Finite-lived intangible asset, useful life	9 years
Finite-Lived Intangible Assets, Net	$ 18,351
CLIA Diagnostic Lab [Member]
Finite-lived intangible asset, useful life	2 years 109 days
Finite-Lived Intangible Assets, Net	$ 609
RedPath [Member]
Finite-Lived Intangible Assets, Net	47,468
Finite-Lived Intangible Assets, Net	42,522
Finite-Lived Intangible Assets, Accumulated Amortization	$ (5,555)

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

+ Details

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

- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

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

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=idxg_DiagnosticTestThyroidMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=idxg_AsuragenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=idxg_DiagnosticTestPancreasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=idxg_RedpathMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=idxg_DiagnosticTestBiobankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=idxg_DiagnosticTestBarrettsRedpathMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=idxg_CLIADiagnosticLabMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: