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PROPERTY AND EQUIPMENT (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 822 $ 1,391
Less accumulated depreciation and amortization (720) (1,208)
Property and equipment, net 102 183
Furniture and computer equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 711 1,268
Lab equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, gross   12
Leasehold improvements    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 111 $ 111