PROPERTY AND EQUIPMENT - Components of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment	$ 3,871	$ 3,817
Less: accumulated depreciation and amortization	(3,348)	(3,090)
Property and equipment, net	523	727
Lab equipment
Property, Plant and Equipment [Line Items]
Property and equipment	2,507	2,489
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment	741	741
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property and equipment	457	428
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment	$ 166	$ 159

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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