PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 114,682	$ 92,818
Less: Accumulated depreciation	(44,943)	(36,368)
Property and equipment, net	69,739	56,450
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,006	1,006
Building and improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	39,285	24,101
Office and lab equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	55,333	33,269
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	6,941	4,431
Construction-in-progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 12,117	$ 30,011

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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