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PROPERTY AND EQUIPMENT (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 128,316 $ 114,682
Less: Accumulated depreciation (47,701) (44,943)
Property and equipment, net 80,615 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 46,304 39,285
Office and lab equipment [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 57,753 55,333
Furniture and fixtures [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 6,983 6,941
Construction-in-progress [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 14,634 $ 12,117