Note 5 - Fair Value Measurements (Details Textual) - Asuragen and Redpath [Member] $ in Millions	3 Months Ended
Mar. 31, 2016 USD ($)
Business Combination, Contingent Cash Consideration, Deferred Payments	$ 4.6
Business Combination, Contingent Cash Consideration, Revenue Based Payments	$ 13.9

Represents contingent cash consideration related to revenue based payments.

No definition available.

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Namespace Prefix:	idxg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration