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PROPERTY AND EQUIPMENT, NET (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Cost $ 9,629 $ 9,366  
Accumulated depreciation 4,982 3,401  
Depreciated cost 4,647 5,965  
Depreciation 1,593 1,484 $ 1,106
Computers, software and related equipment [Member]      
Property, Plant and Equipment [Line Items]      
Cost 1,346 1,198  
Accumulated depreciation 958 690  
Laboratory equipment and office furniture [Member]      
Property, Plant and Equipment [Line Items]      
Cost 5,752 5,691  
Accumulated depreciation 3,369 2,399  
Leasehold improvements [Member]      
Property, Plant and Equipment [Line Items]      
Cost 2,531 2,477  
Accumulated depreciation 655 312  
Obsolete property and equipment and certain nonfunctional Lab equipment [Member]      
Property, Plant and Equipment [Line Items]      
Cost 12 230  
Accumulated depreciation $ 12 $ 230