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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS - Long-term Investments, AioTV Inc. (Details) - USD ($)
 3 Months Ended 12 Months Ended
May 30, 2017
Dec. 07, 2015
Nov. 30, 2012
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Significant inputs for the valuation model                    
Investment impairment               $ 1,690,000 $ 5,336,000 $ 16,347,000
Equity income (loss) of associates               $ (687,000) 984,000 $ (13,954,000)
AioTV                    
Significant inputs for the valuation model                    
Carrying amount of the investment             $ 1,700,000   1,700,000  
AioTV | Common Stock                    
Significant inputs for the valuation model                    
Preferred stock converted to common shares 25,527,008                  
Convertible debentures converted to ordinary shares 2,269,856                  
Debt instrument, conversion price (in dollars per share) $ 0.253790596                  
AioTV | Series B preferred stock                    
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS                    
Investment amount     $ 8,000,000              
Per share price of investment     $ 0.320937              
Equity method investment, ownership interest (as a percent)       45.00%       45.00%    
Significant inputs for the valuation model                    
Total fair value of invested Capital as at valuation date                 $ 900,000  
Risk free rate of interest (as a percent)                 0.80%  
Dividend yield (as a percent)                 0.00%  
Expiration date                 Nov. 14, 2017  
Volatility (as a percent)                 41.00%  
Discount rate (as a percent)                 50.00%  
Investment impairment                 $ 4,300,000  
Carrying amount of the investment             900,000   900,000  
Convertible shares 25,527,008                  
AioTV | Convertible bonds of private company                    
Significant inputs for the valuation model                    
Payment to acquire available-for-sale debt securities   $ 500,000         $ 300,000      
Interest rate of debt securities (as a percent)   10.00%         10.00%      
Investment impairment               $ 400,000 0  
Carrying amount of the investment       $ 0 $ 0   $ 800,000 $ 0 $ 800,000  
Equity income (loss) of associates       $ (200,000) (200,000)          
Common stocks         $ 0          
Loss from equity method investment (as a percent)       45.00% 45.00%          
Note Purchase Agreement | AioTV                    
Significant inputs for the valuation model                    
Principal amount $ 320,000                  
Capital value $ 160,000                  
Note Purchase Agreement | AioTV | Common Stock                    
Significant inputs for the valuation model                    
Conversion price (in dollars per share) $ 0.320937                  
Note Purchase Agreement | AioTV | Convertible bonds of private company                    
Significant inputs for the valuation model                    
Investment impairment           $ 1,300,000        
Equity income (loss) of associates         $ (100,000)          
Convertible promissory note, value $ 800,000                  
Payments to acquire investments         $ 380,000 $ 100,000        
Note Purchase Agreement | AioTV | Convertible debentures                    
Significant inputs for the valuation model                    
Principal amount 576,068                  
Accrued and unpaid interests $ 500,000