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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
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
May 31, 2017
Dec. 30, 2016
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS                      
Per share price of investment                     $ 2.00
Other than Temporary Impairment Losses, Investments [Abstract]                      
Other than Temporary Impairment Losses, Investments             $ 5,336,000 $ 16,347,000 $ 3,947,000    
Impairment charge             5,336,000 16,347,000 $ 3,947,000    
AioTV                      
Other than Temporary Impairment Losses, Investments [Abstract]                      
Carrying amount of the investment           $ 1,700,000 1,700,000        
AioTV | Series B preferred stock                      
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS                      
Payments to acquire available-for-sale equity securities     $ 8,000,000                
Per share price of investment     $ 0.320937                
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]                      
Total fair value of invested Capital as at valuation date             $ 900,000 $ 5,200,000      
Risk free rate of interest (as a percent)             0.80% 1.60%      
Dividend yield (as a percent)             0.00% 0.00%      
Expiration date             Nov. 14, 2017 Nov. 14, 2017      
Volatility (as a percent)             41.00% 50.80%      
Discount rate (as a percent)             50.00% 35.00%      
Other than Temporary Impairment Losses, Investments [Abstract]                      
Other than Temporary Impairment Losses, Investments             $ 4,300,000        
Carrying amount of the investment           $ 900,000 $ 900,000        
Equity method investment, ownership interest (as a percent)           44.00% 44.00%        
Impairment charge             $ 4,300,000        
AioTV | Convertible bonds of privately-held company                      
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS                      
Payment to acquire available-for-sale debt securities   $ 500,000       $ 300,000          
Interest rate of debt securities (as a percent)   10.00%       1000.00%          
Other than Temporary Impairment Losses, Investments [Abstract]                      
Other than Temporary Impairment Losses, Investments             0        
Carrying amount of the investment           $ 800,000 800,000        
Impairment charge             $ 0        
Note Purchase Agreement | Subsequent Event | AioTV                      
Other than Temporary Impairment Losses, Investments [Abstract]                      
Carrying amount of the investment $ 800,000                 $ 800,000  
Principal amount $ 480,685                    
Note Purchase Agreement | Subsequent Event | AioTV | Common Stock                      
Other than Temporary Impairment Losses, Investments [Abstract]                      
Preferred stock converted to common shares 25,527,008                    
Convertible debentures converted to ordinary shares 2,269,856                    
Conversion price (in dollars per share) $ 0.320937                    
Debt instrument, conversion price (in dollars per share) $ 0.253790596                    
Note Purchase Agreement | Subsequent Event | AioTV | Series B preferred stock                      
Other than Temporary Impairment Losses, Investments [Abstract]                      
Convertible shares 25,527,008                    
Note Purchase Agreement | Subsequent Event | AioTV | Convertible bonds of privately-held company                      
Other than Temporary Impairment Losses, Investments [Abstract]                      
Convertible promissory note, value $ 319,315                    
Payments to acquire investments       $ 380,000 $ 100,000            
Note Purchase Agreement | Subsequent Event | AioTV | Convertible debentures                      
Other than Temporary Impairment Losses, Investments [Abstract]                      
Principal amount 576,068                    
Accrued and unpaid interests $ 500,000