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PROPERTY AND EQUIPMENT (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 145,148 $ 114,682
Less: Accumulated depreciation (57,276) (44,943)
Property and equipment, net 87,872 69,739
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 2,642 1,006
Building and improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 47,994 39,285
Office and lab equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 74,726 55,333
Furniture and fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 7,592 6,941
Construction-in-progress [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 12,194 $ 12,117