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PROPERTY AND EQUIPMENT (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 59,370 $ 50,304
Less: Accumulated depreciation (32,167) (27,897)
Property and equipment, net 27,203 22,407
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 820 820
Building and improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 20,384 19,642
Office and lab equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 30,728 25,086
Furniture and fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 3,097 2,457
Construction-in-progress [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 4,341 $ 2,299