SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property, Plant and Equipment, Patent Costs, Intangible Assets and Goodwill (Details)					3 Months Ended		6 Months Ended		12 Months Ended
	Oct. 02, 2018 USD ($)	Dec. 15, 2017 USD ($)	Aug. 01, 2017 USD ($)	Apr. 25, 2017 USD ($)	Jun. 30, 2019 USD ($) item	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) item	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Property, plant and equipment
Property, plant and equipment, at cost					$ 406,073,000		$ 406,073,000		$ 303,121,000
Accumulated depreciation					(70,574,000)		(70,574,000)		(57,862,000)
Property, plant and equipment, net					335,499,000		335,499,000		245,259,000
Assets under construction					$ 206,100,000		206,100,000
Impairment of long-lived assets							$ 0		0
Software Capitalization Policy
Software development stages | item					3		3
Goodwill and Intangible assets
Finite-lived intangible assets					$ 33,171,000		$ 33,171,000		33,058,000
Less: Accumulated amortization					(5,722,000)		(5,722,000)		(4,107,000)
Finite-lived intangible assets, net					27,449,000		27,449,000		28,951,000
Total Finite-lived intangible assets, net					27,767,000		27,767,000		29,002,000
Goodwill					17,279,000		17,279,000		17,279,000
Goodwill and intangible assets, net					45,046,000		45,046,000		46,281,000
Finite-Lived Intangible Assets
Intangibles, net					27,449,000		27,449,000		28,951,000
Amortization expense over remaining useful life
2019					1,614,000		1,614,000
2020					3,231,000		3,231,000
2021					3,129,000		3,129,000
2022					2,967,000		2,967,000
2023					2,953,000		2,953,000
Thereafter					13,555,000		13,555,000
Finite-lived intangible assets, net					27,449,000		27,449,000		28,951,000
Amortization of intangible assets							1,615,000	$ 1,228,000
Depreciation expense							13,400,000	8,800,000
Impairment losses							0		0
Recognized Goodwill
Goodwill					17,279,000		17,279,000		17,279,000
Impairment							0		0
Sampleminded Inc
Goodwill and Intangible assets
Finite-lived intangible assets, net					700,000		700,000		800,000
Finite-Lived Intangible Assets
Intangibles, net					700,000		700,000		800,000
Amortization expense over remaining useful life
Finite-lived intangible assets, net					700,000		700,000		800,000
Amortization of intangible assets					36,000	$ 36,000	100,000	100,000
Identifiable intangible assets			$ 1,000,000.0
Biomatrica, Inc
Goodwill and Intangible assets
Finite-lived intangible assets	$ 8,800,000
Finite-lived intangible assets, net					8,400,000		8,400,000		8,700,000
Goodwill									15,300,000
Finite-Lived Intangible Assets
Intangibles, net					8,400,000		8,400,000		8,700,000
Amortization expense over remaining useful life
Finite-lived intangible assets, net					8,400,000		8,400,000		8,700,000
Amortization of intangible assets					100,000		300,000
Recognized Goodwill
Goodwill									15,300,000
Trade name
Goodwill and Intangible assets
Finite-lived intangible assets, net					665,000		665,000
Finite-Lived Intangible Assets
Intangibles, net					665,000		$ 665,000
Weighted Average Remaining Life (Years)							14 years 3 months 18 days
Amortization expense over remaining useful life
Finite-lived intangible assets, net					665,000		$ 665,000
Trade name | Biomatrica, Inc
Goodwill and Intangible assets
Finite-lived intangible assets, net	700,000
Finite-Lived Intangible Assets
Intangibles, net	700,000
Weighted Average Remaining Life (Years)							15 years
Amortization expense over remaining useful life
Finite-lived intangible assets, net	700,000
Customer Relationships
Goodwill and Intangible assets
Finite-lived intangible assets, net					2,566,000		$ 2,566,000
Finite-Lived Intangible Assets
Intangibles, net					2,566,000		$ 2,566,000
Weighted Average Remaining Life (Years)							14 years 3 months 18 days
Amortization expense over remaining useful life
Finite-lived intangible assets, net					2,566,000		$ 2,566,000
Customer Relationships | Sampleminded Inc
Property, plant and equipment
Estimated Useful Life			3 years
Amortization expense over remaining useful life
Identifiable intangible assets			$ 100,000
Customer Relationships | Biomatrica, Inc
Goodwill and Intangible assets
Finite-lived intangible assets, net	2,700,000
Finite-Lived Intangible Assets
Intangibles, net	2,700,000
Weighted Average Remaining Life (Years)							15 years
Amortization expense over remaining useful life
Finite-lived intangible assets, net	2,700,000
Patents
Goodwill and Intangible assets
Finite-lived intangible assets, net					17,846,000		$ 17,846,000
Finite-Lived Intangible Assets
Intangibles, net					17,846,000		$ 17,846,000
Weighted Average Remaining Life (Years)							9 years 2 months 12 days
Amortization expense over remaining useful life
Finite-lived intangible assets, net					17,846,000		$ 17,846,000
Acquired developed technology
Goodwill and Intangible assets
Finite-lived intangible assets, net	5,400,000				5,836,000		5,836,000
Finite-Lived Intangible Assets
Intangibles, net	5,400,000				5,836,000		$ 5,836,000
Weighted Average Remaining Life (Years)							13 years 3 months 18 days
Amortization expense over remaining useful life
Finite-lived intangible assets, net	$ 5,400,000				5,836,000		$ 5,836,000
Acquired developed technology | Sampleminded Inc
Property, plant and equipment
Estimated Useful Life			8 years
Amortization expense over remaining useful life
Identifiable intangible assets			$ 900,000
Acquired developed technology | Biomatrica, Inc
Finite-Lived Intangible Assets
Weighted Average Remaining Life (Years)	15 years
Internally developed technology
Goodwill and Intangible assets
Finite-lived intangible assets, net					536,000		536,000
Finite-Lived Intangible Assets
Intangibles, net					536,000		$ 536,000
Weighted Average Remaining Life (Years)							2 years 4 months 24 days
Amortization expense over remaining useful life
Finite-lived intangible assets, net					536,000		$ 536,000
Licensed intellectual property and patents
Amortization expense over remaining useful life
Intangible asset, estimated useful life							10 years
Noncompete Agreements | Sampleminded Inc
Property, plant and equipment
Estimated Useful Life			5 years
Amortization expense over remaining useful life
Identifiable intangible assets			$ 32,000
Armune | Licensed intellectual property and patents
Goodwill and Intangible assets
Finite-lived intangible assets, net					10,800,000		$ 10,800,000		11,300,000
Finite-Lived Intangible Assets
Intangibles, net					10,800,000		10,800,000		11,300,000
Amortization expense over remaining useful life
Finite-lived intangible assets, net					10,800,000		10,800,000		11,300,000
Amortization of intangible assets					200,000	200,000	500,000	500,000
Asset Purchase Agreement | Armune | Licensed intellectual property and patents
Amortization expense over remaining useful life
Purchases of intangible assets		$ 12,000,000.0
Contingent payment obligations		17,500,000
Intangible asset acquired		$ 12,200,000
MDx Health
Amortization expense over remaining useful life
Liabilities relieved were related to historical milestones and accrued royalties				$ 6,600,000
MDx Health | Patents
Amortization expense over remaining useful life
Amount paid in exchange for intangible assets				15,000,000.0
MDx Health | Royalty Buy-Out Agreement | Patents
Amortization expense over remaining useful life
Amount paid in exchange for intangible assets				8,000,000.0
MDx Health | Royalty Buy-Out Agreement | Licensed intellectual property and patents
Goodwill and Intangible assets
Finite-lived intangible assets, net					7,000,000.0		7,000,000.0		7,700,000
Finite-Lived Intangible Assets
Intangibles, net					7,000,000.0		7,000,000.0		7,700,000
Amortization expense over remaining useful life
Finite-lived intangible assets, net					7,000,000.0		7,000,000.0		7,700,000
Amortization of intangible assets					300,000	$ 300,000	700,000	$ 700,000
MDx Health | Patent Purchase Agreement | Patents
Amortization expense over remaining useful life
Amount paid in exchange for intangible assets				$ 7,000,000.0
Land
Property, plant and equipment
Property, plant and equipment, at cost					4,466,000		4,466,000		4,466,000
Leasehold and building improvements
Property, plant and equipment
Property, plant and equipment, at cost					59,796,000		59,796,000		38,895,000
Assets under construction					166,400,000		166,400,000
Expected cost to complete project					96,500,000		96,500,000
Land improvements
Property, plant and equipment
Property, plant and equipment, at cost					1,766,000		$ 1,766,000		$ 1,530,000
Estimated Useful Life							15 years		15 years
Buildings
Property, plant and equipment
Property, plant and equipment, at cost					18,086,000		$ 18,086,000		$ 7,928,000
Estimated Useful Life							30 years		30 years
Computer equipment and computer software
Property, plant and equipment
Property, plant and equipment, at cost					38,225,000		$ 38,225,000		$ 36,969,000
Estimated Useful Life							3 years		3 years
Assets under construction					13,800,000		$ 13,800,000
Expected cost to complete project					3,300,000		3,300,000
Laboratory equipment
Property, plant and equipment
Property, plant and equipment, at cost					66,347,000		66,347,000		$ 37,518,000
Assets under construction					25,900,000		25,900,000
Expected cost to complete project					8,300,000		$ 8,300,000
Laboratory equipment | Minimum
Property, plant and equipment
Estimated Useful Life							3 years		3 years
Laboratory equipment | Maximum
Property, plant and equipment
Estimated Useful Life							10 years		10 years
Furniture and fixtures
Property, plant and equipment
Property, plant and equipment, at cost					11,267,000		$ 11,267,000		$ 8,353,000
Estimated Useful Life							3 years		3 years
Assets under construction
Property, plant and equipment
Property, plant and equipment, at cost					206,120,000		$ 206,120,000		$ 167,462,000
Goodwill and Intangible assets
Finite-lived intangible assets, net					318,000		318,000		51,000
Finite-Lived Intangible Assets
Intangibles, net					318,000		318,000		51,000
Amortization expense over remaining useful life
Finite-lived intangible assets, net					$ 318,000		$ 318,000		$ 51,000