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PROPERTY AND EQUIPMENT (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 134,337 $ 114,682
Less: Accumulated depreciation (50,742) (44,943)
Property and equipment, net 83,595 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 46,623 39,285
Office and lab equipment [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 62,388 55,333
Furniture and fixtures [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 7,331 6,941
Construction-in-progress [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 15,353 $ 12,117