PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 149,241	$ 145,148
Less: Accumulated depreciation	(60,891)	(57,276)
Property and equipment, net	88,350	87,872
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,642	2,642
Building and improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	49,790	47,994
Office and lab equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	75,784	74,726
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	7,787	7,592
Construction-in-progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 13,238	$ 12,194

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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