Collaboration and Commercial Technology Licensing Agreements (Details) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended	12 Months Ended	3 Months Ended	1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2014 Specimen transfer agreements	Jun. 30, 2013 Specimen transfer agreements	Jun. 30, 2014 Specimen transfer agreements	Jun. 30, 2013 Specimen transfer agreements	Jun. 30, 2014 Oncotype DX DCIS score agreement	Jun. 30, 2014 Oncotype DX DCIS score agreement	Dec. 31, 2013 Oncotype DX DCIS score agreement	Dec. 31, 2013 Exclusive license agreement	Feb. 28, 2014 Genomic Prostate Score agreement	Jun. 30, 2014 Technology license agreements	Jun. 30, 2013 Technology license agreements	Jun. 30, 2014 Technology license agreements	Jun. 30, 2013 Technology license agreements	Jun. 30, 2014 Oncotype DX colon cancer test and Oncotype DX prostate cancer test
Collaboration and Commercial Technology Licensing Agreements
Collaboration expense	$ 1,000,000	$ 639,000	$ 2,200,000	$ 1,100,000	$ 164,000	$ 401,000
Capitalized milestone payment							392,000		367,000
Up-front payment								9,000,000
Costs recorded under collaborative arrangements										2,500,000	2,300,000	4,800,000	4,400,000
Fixed future annual payments, exclusive of royalty payments
2015														$ 550,000