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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