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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS - Long-term Investments, AioTV Inc. - Additional Information (Details) |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 19, 2018 USD ($) | May 30, 2017 USD ($) $ / shares shares | Dec. 07, 2015 USD ($) | Nov. 30, 2012 USD ($) $ / shares | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Significant inputs for the valuation model |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment impairment |  |  |  |  |  |  |  |  |  | $ 1,029,000 |  | $ 370,000 |  |
Equity loss of associates |  |  |  |  |  |  |  |  | $ (400,000) |  |  | $ (613,000) |  |
Measurement Input, Expected Dividend Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant inputs for the valuation model |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total fair value of significant inputs |  |  |  |  |  |  |  | 0.00 |  |  |  |  |  | 0.00
AioTV |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant inputs for the valuation model |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount of the investment |  |  |  |  |  |  |  | $ 1,700,000 |  |  |  |  |  | $ 1,700,000
Cash consideration by the buyer | $ 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction closing date |  |  |  |  |  |  |  |  |  |  | Apr. 11, 2019 |  |  |
AioTV | Note Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant inputs for the valuation model |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 320,000 |  |  |  |  |  |  |  |  |  |  |  |
Capital value |  | $ 160,000 |  |  |  |  |  |  |  |  |  |  |  |
AioTV | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant inputs for the valuation model |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible debentures converted to ordinary shares | shares |  | 2,269,856 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, conversion price (in dollars per share) | $ / shares |  | $ 0.253790596 |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock converted to common shares | shares |  | 25,527,008 |  |  |  |  |  |  |  |  |  |  |  |
AioTV | Common Stock | Note Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant inputs for the valuation model |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  | $ 0.320937 |  |  |  |  |  |  |  |  |  |  |  |
AioTV | Series B preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment amount |  |  |  | $ 8,000,000 |  |  |  |  |  |  |  |  |  |
Per share price of investment | $ / shares |  |  |  | $ 0.320937 |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership interest (as a percent) |  |  |  |  | 45.00% |  |  |  |  |  |  |  | 45.00% |
Significant inputs for the valuation model |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment impairment |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,300,000
Carrying amount of the investment |  |  |  |  |  |  |  | $ 900,000 |  |  |  |  |  | $ 900,000
Convertible shares | shares |  | 25,527,008 |  |  |  |  |  |  |  |  |  |  |  |
AioTV | Series B preferred stock | Discount rate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant inputs for the valuation model |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total fair value of significant inputs |  |  |  |  |  |  |  | 50 |  |  |  |  |  | 50
AioTV | Series B preferred stock | Measurement Input, Expected Dividend Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant inputs for the valuation model |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total fair value of significant inputs |  |  |  |  |  |  |  | 0.00 |  |  |  |  |  | 0.00
AioTV | Convertible bonds of private company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant inputs for the valuation model |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment impairment |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000 | $ 0
Payment to acquire available-for-sale debt securities |  |  | $ 500,000 |  |  |  |  | $ 300,000 |  |  |  |  |  |
Interest rate of debt securities (as a percent) |  |  | 10.00% |  |  |  |  | 10.00% |  |  |  |  |  | 10.00%
Carrying amount of the investment |  |  |  |  | $ 0 | $ 0 |  | $ 800,000 |  |  |  |  | $ 0 | $ 800,000
Equity loss of associates |  |  |  |  | $ (200,000) | $ (200,000) |  |  |  |  |  |  |  |
Loss from equity method investment (as a percent) |  |  |  |  | 45.00% | 45.00% |  |  |  |  |  |  |  |
Common stocks |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |
AioTV | Convertible bonds of private company | Note Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant inputs for the valuation model |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment impairment |  |  |  |  |  |  | $ 1,300,000 |  |  |  |  |  |  |
Convertible promissory note, value |  | $ 800,000 |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire investments |  |  |  |  |  | 380,000 | $ 100,000 |  |  |  |  |  |  |
Equity loss of associates |  |  |  |  |  | $ (100,000) |  |  |  |  |  |  |  |
AioTV | Convertible debentures | Note Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant inputs for the valuation model |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | 576,068 |  |  |  |  |  |  |  |  |  |  |  |
Accrued and unpaid interests |  | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |

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