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PROPERTY AND EQUIPMENT (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 165,253 $ 145,148
Less: Accumulated depreciation (68,423) (57,276)
Property and equipment, net 96,830 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 51,000 47,994
Office and lab equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 81,681 74,726
Furniture and fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 8,592 7,592
Construction-in-progress [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 21,338 $ 12,194