Collaboration and Commercial Technology Licensing Agreements (Details) - USD ($)	1 Months Ended			3 Months Ended		6 Months Ended
	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2014	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Feb. 28, 2017
Collaboration and specimen transfer agreements
Collaboration payments and costs
Collaboration expense				$ 912,000	$ 1,600,000	$ 1,800,000	$ 2,500,000
Technology license agreements
Collaboration payments and costs
Costs recorded under collaborative arrangements				94,000	2,500,000	190,000	5,100,000
Oncotype DX DCIS clinical study
Collaboration payments and costs
Period from achieving key milestone entity required to make fixed annual payments			1 year
Final payment				504,000		504,000
Exclusive distribution rights Epic's AR-V7 Nucleus Detect
Collaboration payments and costs
Obligation upon achievement of certain milestones		$ 4,000,000			4,000,000		4,000,000
Investment in subordinated convertible promissory notes per agreement				$ 7,500,000		$ 7,500,000
Investment in preferred stock per collaboration agreement		$ 2,500,000			$ 2,500,000		$ 2,500,000
Term of agreement		10 years
Fair value of convertible promissory notes								$ 7,100,000
Deferred cost	$ 375,000