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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, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Cost   $ 2,179
Cash Collection   (479)
Impairment charges and equity losses   (1,308)
Transfer- out from available- for- sale investments   (392)
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
Cash Collection   (479)
Convertible bonds of private company    
Schedule of Available-for-sale Securities [Line Items]    
Cost   800
Impairment charges and equity losses   (408)
Transfer- out from available- for- sale investments   (392)
Preferred convertible shares of private company    
Schedule of Available-for-sale Securities [Line Items]    
Cost   900
Impairment charges and equity losses   $ (900)