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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS - Summary of Available-for-sale Investments (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 6,479 | $ 50,999
Cash Collection |  | (12,299)
Impairment charges and equity losses | (4,300) | (22,800)
Transfer-out from available-for-sale investments |  | (10,000)
Realized gain |  | (200)
Estimated fair value | 2,179 | 5,700
Level 3 |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated fair value | $ 4,800 |
Minimum |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Maturity period of bank notes receivable | 3 months |
Maximum |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Maturity period of bank notes receivable | 1 year |
Common Stock |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 479 | 2,299
Cash Collection |  | (2,299)
Estimated fair value | 479 |
Convertible bonds of privately-held company |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 800 | 40,700
Cash Collection |  | (10,000)
Impairment charges and equity losses |  | (20,000)
Transfer-out from available-for-sale investments |  | (10,000)
Realized gain |  | (200)
Estimated fair value | 800 | 500
Preferred convertible shares of privately-held company |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 5,200 | 8,000
Impairment charges and equity losses | (4,300) | (2,800)
Estimated fair value | $ 900 | $ 5,200

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