PROPERTY AND EQUIPMENT, NET - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 15,367	$ 23,837
Less: Accumulated depreciation and amortization	(11,870)	(10,773)
Property and equipment, net	3,497	13,064
Furniture and office equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,557	2,237
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,731	11,391
Laboratory equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	221	351
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 9,858	$ 9,858