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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS - Summary of Equity Investee Data (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating data:      
Revenue $ 15    
Gross profit 15    
Income (loss) from operations (1,906) $ 950 $ (9)
Net income (loss) (2,524) 2,812 (9)
Net income (loss) attributable to Equity method investees (1,079) 984 (3)
Balance sheet data:      
Current assets 14,859 18,616 7
Long-term assets 148 105 18,238
Current liabilities $ (12,150) $ (11,669) $ (14,135)