PROPERTY AND EQUIPMENT (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 37,649	$ 32,521
Less: Accumulated depreciation	(22,756)	(20,713)
Property and equipment, net	14,893	11,808
Depreciation expense	2,044	1,978	1,451
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	15,605	11,652
Office and lab equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	20,055	19,056
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	423	374
Construction-in-progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 746	$ 619