SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property & Equipment, Patent Costs and Intangibles (Details)		3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 25, 2017 USD ($)	Sep. 30, 2017 USD ($) item	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) item	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Aug. 01, 2017 USD ($)
Property and equipment
Assets under construction		$ 20,868,000		$ 20,868,000		$ 6,711,000
Leasehold improvements		$ 14,200,000		14,200,000		13,549,000
Impairment of long-lived assets				$ 0		0
Software Capitalization Policy
Software development stages | item		3		3
Patent Costs and Intangible Assets
Accrued liabilities		$ 38,390,000		$ 38,390,000		28,106,000
Amortization of intangible assets				645,000	$ 150,000
Licensed Intellectual Property
Patent Costs and Intangible Assets
Intangible asset, net						1,600,000
Accrued liabilities						1,300,000
Amortization of intangible assets		300,000	$ 100,000	$ 600,000	$ 200,000
Amortization expense over remaining useful life
Total						$ 1,600,000
MDx | Licensed Intellectual Property
Patent Costs and Intangible Assets
Estimated useful life				10 years
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
Assets under construction		2,700,000		$ 2,700,000
Furniture and fixtures
Property and equipment
Estimated Useful Life				3 years
Assets under construction		200,000		$ 200,000
Buildings
Property and equipment
Estimated Useful Life				30 years
Machinery and equipment
Property and equipment
Assets under construction		10,000,000		$ 10,000,000
Expected cost to complete construction of project		8,400,000		8,400,000
Buildings and Leasehold Improvements
Property and equipment
Assets under construction		8,000,000		8,000,000
Expected cost to complete construction of project		11,900,000		$ 11,900,000
Royalty Buy-Out Agreement | Licensed Intellectual Property
Patent Costs and Intangible Assets
Estimated useful life				7 years
Intangible asset, net		9,367,000		$ 9,367,000
Amortization expense over remaining useful life
2017		335,000		335,000
2018		1,338,000		1,338,000
2019		1,338,000		1,338,000
2020		1,338,000		1,338,000
2021		1,338,000		1,338,000
Thereafter		3,680,000		3,680,000
Total		9,367,000		9,367,000
Royalty Buy-Out Agreement | MDx
Patent Costs and Intangible Assets
One-time fee for a royalty-free, fully-paid, perpetual and assignable license to patents	$ 8,000,000
Payment for the assignment of certain other patent rights which were not covered by the original agreement	7,000,000
Total payment under second amendment to license agreement	15,000,000
Current liabilities related to the second amendment to the license agreement	$ 6,600,000
Royalty Buy-Out Agreement | MDx | Licensed Intellectual Property
Patent Costs and Intangible Assets
Estimated useful life	10 years
Sampleminded Inc
Property and equipment
Goodwill		2,000,000		2,000,000			$ 2,000,000
Identifiable intangible assets		1,000,000		1,000,000			$ 1,000,000
Patent Costs and Intangible Assets
Intangible asset, net		951,000		951,000
Amortization of intangible assets				20,000
Amortization expense over remaining useful life
2017		30,000		30,000
2018		118,000		118,000
2019		118,000		118,000
2020		118,000		118,000
2021		118,000		118,000
Thereafter		449,000		449,000
Total		951,000		$ 951,000
Sampleminded Inc | Developed Technology
Property and equipment
Estimated Useful Life				8 years
Identifiable intangible assets		900,000		$ 900,000
Sampleminded Inc | Customer Relationships
Property and equipment
Estimated Useful Life				13 years
Identifiable intangible assets		100,000		$ 100,000
Sampleminded Inc | Noncompete Agreements
Property and equipment
Estimated Useful Life				5 years
Identifiable intangible assets		$ 32,000		$ 32,000