SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property, Plant and Equipment, Patent Costs and Intangibles (Details)		3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 15, 2017 USD ($)	Sep. 30, 2018 USD ($) item	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) item	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Apr. 25, 2017 USD ($)
Property, plant and equipment
Property, plant and equipment, gross		$ 239,757,000		$ 239,757,000		$ 118,072,000
Less-Accumulated depreciation		(51,271,000)		(51,271,000)		(38,086,000)
Property, plant and equipment, net		188,486,000		188,486,000		79,986,000
Assets under construction		$ 110,900,000		110,900,000
Impairment of long-lived assets				$ 0		0
Software Capitalization Policy
Software development stages | item		3		3
Intangible Assets
Finite-lived intangible assets		$ 23,856,000		$ 23,856,000		23,731,000
Less: Accumulated amortization		(3,342,000)		(3,342,000)		(1,505,000)
Finite-lived intangible assets, net		20,514,000		20,514,000		22,226,000
Indefinite-lived intangible assets
Goodwill		1,979,000		1,979,000		1,979,000
Net carrying value		22,493,000		22,493,000		24,205,000
Amortization expense over remaining useful life
2018		618,000		618,000
2019		2,472,000		2,472,000
2020		2,467,000		2,467,000
2021		2,391,000		2,391,000
2022		2,370,000		2,370,000
Thereafter		10,196,000		10,196,000
Finite-lived intangible assets, net		20,514,000		20,514,000		22,226,000
Accrued liabilities		68,938,000		68,938,000		49,126,000
Amortization of intangible assets				1,847,000	$ 645,000
Purchases of intangible assets					8,442,000
Impairment losses				0		0
Sampleminded Inc
Intangible Assets
Finite-lived intangible assets, net		800,000		800,000		900,000
Indefinite-lived intangible assets
Goodwill			$ 2,000,000		2,000,000
Amortization expense over remaining useful life
Finite-lived intangible assets, net		800,000		800,000		900,000
Amortization of intangible assets		36,000	20,000	100,000	20,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			$ 1,000,000		1,000,000
Licensed intellectual property and patents
Intangible Assets
Finite-lived intangible assets, net		19,544,000		$ 19,544,000
Indefinite-lived intangible assets
Estimated useful life				9 years 9 months 18 days
Amortization expense over remaining useful life
Finite-lived intangible assets, net		19,544,000		$ 19,544,000
Developed Technology
Intangible Assets
Finite-lived intangible assets, net		970,000		$ 970,000
Indefinite-lived intangible assets
Estimated useful life				6 years 2 months 12 days
Amortization expense over remaining useful life
Finite-lived intangible assets, net		970,000		$ 970,000
Developed Technology | Sampleminded Inc
Property, plant and equipment
Estimated Useful Life			8 years
Amortization expense over remaining useful life
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			$ 900,000		900,000
Customer Relationships | Sampleminded Inc
Property, plant and equipment
Estimated Useful Life			3 years
Amortization expense over remaining useful life
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			$ 100,000		100,000
Noncompete Agreements | Sampleminded Inc
Property, plant and equipment
Estimated Useful Life			5 years
Amortization expense over remaining useful life
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			$ 32,000		32,000
Armune | Licensed intellectual property and patents
Intangible Assets
Finite-lived intangible assets, net		11,500,000		11,500,000		12,200,000
Amortization expense over remaining useful life
Finite-lived intangible assets, net		11,500,000		11,500,000		12,200,000
Amortization of intangible assets		200,000		700,000
Land
Property, plant and equipment
Property, plant and equipment, gross		4,466,000		4,466,000		4,466,000
Leasehold and building improvements
Property, plant and equipment
Property, plant and equipment, gross		35,264,000		35,264,000		17,629,000
Assets under construction		79,900,000		79,900,000
Expected cost to complete project		188,700,000		188,700,000
Land improvements
Property, plant and equipment
Property, plant and equipment, gross		1,530,000		$ 1,530,000		$ 1,419,000
Estimated Useful Life				15 years		15 years
Buildings
Property, plant and equipment
Property, plant and equipment, gross		9,886,000		$ 9,886,000		$ 7,928,000
Buildings | Minimum
Property, plant and equipment
Estimated Useful Life				30 years		30 years
Buildings | Maximum
Property, plant and equipment
Estimated Useful Life				40 years		40 years
Computer equipment and computer software
Property, plant and equipment
Property, plant and equipment, gross		35,355,000		$ 35,355,000		$ 30,148,000
Estimated Useful Life				3 years		3 years
Assets under construction		2,900,000		$ 2,900,000
Expected cost to complete project		2,800,000		2,800,000
Equipment
Property, plant and equipment
Property, plant and equipment, gross		34,720,000		34,720,000		$ 23,296,000
Assets under construction		28,100,000		28,100,000
Expected cost to complete project		7,000,000		$ 7,000,000
Equipment | Minimum
Property, plant and equipment
Estimated Useful Life				3 years		3 years
Equipment | Maximum
Property, plant and equipment
Estimated Useful Life				5 years		5 years
Furniture And Fixtures
Property, plant and equipment
Property, plant and equipment, gross		7,608,000		$ 7,608,000		$ 4,531,000
Estimated Useful Life				3 years		3 years
Assets under construction
Property, plant and equipment
Property, plant and equipment, gross		110,928,000		$ 110,928,000		$ 28,655,000
Royalty Buy-Out Agreement | MDx Health
Amortization expense over remaining useful life
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 Health | Licensed intellectual property and patents
Intangible Assets
Finite-lived intangible assets, net		8,000,000		8,000,000		9,000,000
Amortization expense over remaining useful life
Finite-lived intangible assets, net		8,000,000		8,000,000		$ 9,000,000
Amortization of intangible assets		$ 300,000	$ 300,000	$ 1,000,000	$ 600,000
Asset Purchase Agreement | Armune | Licensed intellectual property and patents
Amortization expense over remaining useful life
Purchases of intangible assets	$ 12,000,000
Contingent payment obligations	17,500,000
Intangible asset acquired	$ 12,200,000