PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 9,699	$ 7,856
Less: accumulated depreciation	(4,980)	(3,835)
Property and equipment, net	4,719	4,021
Depreciation expense	1,290	1,020
Office, Laboratory and Other Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,953	2,756
Equipment Furnished for Customer or Clinical Uses [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	6,615	4,981
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 131	$ 119