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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, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Cost $ 2,179 $ 6,479
Cash Collection (479)  
Impairment charges and equity losses (1,308) (4,300)
Transfer-out from available-for-sale investments (392)  
Estimated fair value   2,179
Level 3    
Schedule of Available-for-sale Securities [Line Items]    
Estimated fair value $ 0  
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  
Shares of a private company    
Schedule of Available-for-sale Securities [Line Items]    
Cost $ 479 479
Cash Collection (479)  
Estimated fair value   479
Convertible bonds of private company    
Schedule of Available-for-sale Securities [Line Items]    
Cost 800 800
Impairment charges and equity losses (408)  
Transfer-out from available-for-sale investments (392)  
Estimated fair value   800
Preferred convertible shares of private company    
Schedule of Available-for-sale Securities [Line Items]    
Cost 900 5,200
Impairment charges and equity losses $ (900) (4,300)
Estimated fair value   $ 900