SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property & Equipment and Patent Costs (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2017 USD ($) item	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Property and equipment
Assets under construction	$ 7,200,000		$ 6,711,000
Leasehold improvements	13,653,000		13,549,000
Impairment of long-lived assets	$ 0		0
Software Capitalization Policy
Software development stages | item	3
Patent Costs and Intangible Assets
Accrued liabilities	$ 27,077,000		28,106,000
Amortization of intangible assets	$ 50,000	$ 50,000
MDx Health | Licensed Intellectual Property
Patent Costs and Intangible Assets
Estimated useful life	10 years
Intangible asset, net	$ 1,500,000		1,600,000
Accrued liabilities	1,300,000		$ 1,300,000
Amortization of intangible assets	$ 50,000	$ 50,000
Laboratory equipment | Minimum
Property and equipment
Estimated Useful Life	3 years
Laboratory equipment | Maximum
Property and equipment
Estimated Useful Life	5 years
Computer Equipment and Computer Software
Property and equipment
Estimated Useful Life	3 years
Expected cost to complete construction of project	$ 900,000
Leasehold Improvements
Property and equipment
Assets under construction	100,000
Expected cost to complete construction of project	$ 5,900,000
Furniture and fixtures
Property and equipment
Estimated Useful Life	3 years
Buildings
Property and equipment
Estimated Useful Life	30 years
Software Development
Property and equipment
Assets under construction	$ 2,100,000
Machinery and equipment
Property and equipment
Assets under construction	$ 5,000,000