Collaboration and Commercial Technology Licensing Agreements (Details 2) (Collaborative Diagnostic Development Agreement with Pfizer Inc., USD $) In Millions, unless otherwise specified	1 Months Ended
Dec. 31, 2013	Nov. 30, 2007
Collaborative Diagnostic Development Agreement with Pfizer Inc.
Contract research arrangements
Initial payment received upon joint agreement		$ 1.5
Payment receivable upon joint agreement on gene identification plan		2.2
Additional payments receivable to conduct next phase of development		5.0
Final payment receivable upon completion of clinical validation		1.5
Final substantive milestone payment recognized	$ 1.5

Represents the additional amount receivable under the entity's joint agreement.

No definition available.

Name:	ghdx_ResearchAndDevelopmentArrangementAdditionalAmountReceivable
Namespace Prefix:	ghdx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the amount initially receivable under the entity's joint agreement.

+ References

No definition available.

+ Details

Name:	ghdx_ResearchAndDevelopmentArrangementAmountReceivableUponJointAgreementOnGeneIdentificationPlan
Namespace Prefix:	ghdx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the final payment receivable upon completion of clinical validation under the entity's joint agreement.

+ References

No definition available.

+ Details

Name:	ghdx_ResearchAndDevelopmentArrangementFinalPaymentReceivableUponCompletionOfClinicalValidation
Namespace Prefix:	ghdx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the initial amount received under the entity's joint agreement.

+ References

No definition available.

+ Details

Name:	ghdx_ResearchAndDevelopmentArrangementInitialAmountReceivedUponJointAgreement
Namespace Prefix:	ghdx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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

- Definition

The amount of consideration recognized during the period for the milestone or milestones.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 28

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=19771982&loc=SL6892177-166501

+ Details

Name:	us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration