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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accumulated Other Comprehensive Income (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
entity
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
entity
Changes in AOCI, including the amounts reclassified to income      
Balance $ 83,777 $ 115,329 $ 150,380
Gain reclassified from AOCI to income (38)    
Balance $ 82,741 83,777 $ 115,329
Number of inactive Chinese entities liquidation | entity     3
Number of entities liquidated | entity 2    
Net loss from the cumulative translation adjustment $ 100   $ 100
AOCI Including Portion Attributable to Noncontrolling Interest      
Changes in AOCI, including the amounts reclassified to income      
Balance 61,470 63,754  
Balance 62,002 61,470 $ 63,754
Foreign currency translation      
Changes in AOCI, including the amounts reclassified to income      
Gain (Loss) recorded in other comprehensive loss and Unrealized loss from available-for-sale investments 570 (1,611)  
Unrealized gains (losses), net of tax      
Changes in AOCI, including the amounts reclassified to income      
Gain (Loss) recorded in other comprehensive loss and Unrealized loss from available-for-sale investments   (673)  
AOCI Attributable to Noncontrolling Interest      
Changes in AOCI, including the amounts reclassified to income      
Balance $ 0    
Balance   $ 0