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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of transactions between related parties [line items]      
Salaries $ 305 $ 277 $ 486
Officers And Directors [Member]      
Disclosure of transactions between related parties [line items]      
Salaries 203
Short-term employee benefits 2 2 4
Stock-based compensation 6,072 9,071 15,771
Total $ 6,074 $ 9,073 $ 15,977