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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
segment
product
Mar. 31, 2014
Segment Information    
Number of business segments in which the entity operates 1us-gaap_NumberOfOperatingSegments  
Number of products from which the majority of the entity's product revenues have been derived 1ghdx_NumberOfProducts  
Segment information    
Total revenues $ 68,152us-gaap_Revenues $ 67,002us-gaap_Revenues
United States    
Segment information    
Total revenues 57,717us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US
55,468us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US
Outside of the United States    
Segment information    
Total revenues $ 10,435us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= ghdx_NonUSMember
$ 11,534us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= ghdx_NonUSMember