INTANGIBLE ASSETS AND GOODWILL - Schedule of Finite Lived Intangible Assets Net Balances and Weighted Average Useful Lives (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	$ 971,768	$ 963,690
Less: Accumulated amortization	(43,862)	(20,411)
Finite-lived intangible assets, net	927,906	943,279
Finite-lived and indefinite-lived intangible assets, gross	1,172,123	1,163,961
Finite-lived and indefinite-lived intangible assets, net	1,128,261	1,143,550
In Process Research and Development
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	200,000	200,000
Acquired developed technology
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 355	$ 271
Trade name
Finite-Lived Intangible Assets [Line Items]
Weighted-average remaining useful life of finite-lived intangible asset (in years)	15 years 8 months 12 days	15 years 10 months 24 days
Finite-lived intangible assets, gross	$ 100,700	$ 100,700
Less: Accumulated amortization	(2,535)	(961)
Finite-lived intangible assets, net	$ 98,165	$ 99,739
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Weighted-average remaining useful life of finite-lived intangible asset (in years)	13 years 7 months 6 days	13 years 7 months 6 days
Finite-lived intangible assets, gross	$ 2,700	$ 2,700
Less: Accumulated amortization	(269)	(224)
Finite-lived intangible assets, net	$ 2,431	$ 2,476
Patents
Finite-Lived Intangible Assets [Line Items]
Weighted-average remaining useful life of finite-lived intangible asset (in years)	8 years 7 months 6 days	8 years 9 months 18 days
Finite-lived intangible assets, gross	$ 22,689	$ 22,690
Less: Accumulated amortization	(6,539)	(5,974)
Finite-lived intangible assets, net	$ 16,150	$ 16,716
Acquired developed technology
Finite-Lived Intangible Assets [Line Items]
Weighted-average remaining useful life of finite-lived intangible asset (in years)	9 years 8 months 12 days	9 years 10 months 24 days
Finite-lived intangible assets, gross	$ 814,171	$ 806,371
Less: Accumulated amortization	(32,510)	(12,345)
Finite-lived intangible assets, net	$ 781,661	$ 794,026
Service Agreements
Finite-Lived Intangible Assets [Line Items]
Weighted-average remaining useful life of finite-lived intangible asset (in years)	7 years 3 months 18 days	7 years 6 months
Finite-lived intangible assets, gross	$ 30,000	$ 30,000
Less: Accumulated amortization	(1,560)	(571)
Finite-lived intangible assets, net	$ 28,440	$ 29,429
Internally developed technology
Finite-Lived Intangible Assets [Line Items]
Weighted-average remaining useful life of finite-lived intangible asset (in years)	2 years 4 months 24 days	2 years 6 months
Finite-lived intangible assets, gross	$ 1,508	$ 1,229
Less: Accumulated amortization	(449)	(336)
Finite-lived intangible assets, net	$ 1,059	$ 893