SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property & Equipment, Patent Costs and Intangibles (Details)		3 Months Ended			6 Months Ended		12 Months Ended
	Dec. 15, 2017 USD ($)	Jun. 30, 2018 USD ($) item	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) item	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Apr. 25, 2017 USD ($)
Property, plant and equipment
Property, plant and equipment, gross		$ 187,236,000			$ 187,236,000		$ 118,072,000
Less-Accumulated depreciation		(46,769,000)			(46,769,000)		(38,086,000)
Property, plant and equipment, net		140,467,000			140,467,000		79,986,000
Assets under construction		$ 80,500,000			80,500,000
Impairment of long-lived assets					$ 0	$ 0	0
Software Capitalization Policy
Software development stages | item		3			3
Intangible Assets
Finite-lived intangible assets		$ 23,862,000			$ 23,862,000		23,731,000
Less: Accumulated amortization		(2,733,000)			(2,733,000)		(1,505,000)
Finite-lived intangible assets, net		21,129,000			21,129,000		22,226,000
Indefinite-lived intangible assets
Goodwill		1,979,000			1,979,000		1,979,000
Net carrying value		23,108,000			23,108,000		24,205,000
Amortization expense over remaining useful life
2018		1,237,000			1,237,000
2019		2,474,000			2,474,000
2020		2,469,000			2,469,000
2021		2,383,000			2,383,000
2022		2,370,000			2,370,000
Thereafter		10,196,000			10,196,000
Finite-lived intangible assets, net		21,129,000			21,129,000		22,226,000
Accrued liabilities		60,046,000			60,046,000		49,126,000
Amortization of intangible assets					1,228,000	290,000
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
Amortization expense over remaining useful life
Finite-lived intangible assets, net		800,000			800,000		900,000
Amortization of intangible assets		36,000		$ 0	100,000	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			$ 1,000,000
Licensed intellectual property and patents
Intangible Assets
Finite-lived intangible assets, net		20,110,000			$ 20,110,000
Indefinite-lived intangible assets
Estimated useful life					10 years
Amortization expense over remaining useful life
Finite-lived intangible assets, net		20,110,000			$ 20,110,000
Developed Technology
Intangible Assets
Finite-lived intangible assets, net		1,019,000			$ 1,019,000
Indefinite-lived intangible assets
Estimated useful life					6 years 4 months 24 days
Amortization expense over remaining useful life
Finite-lived intangible assets, net		1,019,000			$ 1,019,000
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
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
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
Armune | Licensed intellectual property and patents
Intangible Assets
Finite-lived intangible assets, net		11,700,000			11,700,000		12,200,000
Amortization expense over remaining useful life
Finite-lived intangible assets, net		11,700,000			11,700,000		12,200,000
Amortization of intangible assets		200,000			500,000
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		23,301,000			23,301,000		17,629,000
Assets under construction		55,400,000			55,400,000
Expected cost to complete project		231,900,000			231,900,000
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		7,928,000			$ 7,928,000		$ 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		33,455,000			$ 33,455,000		$ 30,148,000
Estimated Useful Life					3 years		3 years
Assets under construction		2,400,000			$ 2,400,000
Expected cost to complete project		1,600,000			1,600,000
Laboratory equipment
Property, plant and equipment
Property, plant and equipment, gross		30,345,000			30,345,000		$ 23,296,000
Assets under construction		22,700,000			22,700,000
Expected cost to complete project		9,700,000			$ 9,700,000
Laboratory equipment | Minimum
Property, plant and equipment
Estimated Useful Life					3 years		3 years
Laboratory 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		5,693,000			$ 5,693,000		$ 4,531,000
Estimated Useful Life					3 years		3 years
Assets under construction
Property, plant and equipment
Property, plant and equipment, gross		80,518,000			$ 80,518,000		$ 28,655,000
Royalty Buy-Out Agreement | MDx
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 | Licensed intellectual property and patents
Intangible Assets
Finite-lived intangible assets, net		8,400,000			8,400,000		9,000,000
Amortization expense over remaining useful life
Finite-lived intangible assets, net		8,400,000			8,400,000		$ 9,000,000
Amortization of intangible assets		$ 300,000		$ 200,000	$ 700,000	$ 300,000
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