PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property and Equipment
Total property and equipment	$ 3,494	$ 2,370
Less: accumulated deprecation	(1,668)	(1,332)
Property and equipment, net	1,826	1,038
Depreciation and amortization	336	258	$ 171
Machinery and equipment
Property and Equipment
Total property and equipment	1,447	863
Computers and office equipment
Property and Equipment
Total property and equipment	702	590
Leasehold improvements
Property and Equipment
Total property and equipment	700	700
Construction-in-process
Property and Equipment
Total property and equipment	528	100
Furniture and fixtures
Property and Equipment
Total property and equipment	$ 117	$ 117