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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 |  |  |  |  |  |  |  |  |

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