PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 50,304	$ 44,735
Less: Accumulated depreciation	(27,897)	(24,813)
Property and equipment, net	22,407	19,922
Depreciation expense	3,086	2,077	$ 2,044
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	19,642	17,631
Office and lab equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	25,086	23,666
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,457	506
Construction-in-progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,299	$ 2,112