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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Marketable Securities (Details)
6 Months Ended
Jun. 30, 2016
USD ($)
item
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Available-for-sale securities      
Number of objectives of the entity's investment strategy | item 2    
Realized gains $ 18,000 $ 5,000  
Minimum contractual term of certain current investments which can be liquidated 1 year    
Amortized Cost $ 174,956,000   $ 266,188,000
Gains in Accumulated Other Comprehensive Income 131,000   2,000
Losses in Accumulated Other Comprehensive Income (20,000)   (446,000)
Estimated Fair Value 175,067,000   265,744,000
Realized losses 0 $ 0  
Corporate bonds      
Available-for-sale securities      
Amortized Cost 115,879,000   179,471,000
Gains in Accumulated Other Comprehensive Income 90,000   2,000
Losses in Accumulated Other Comprehensive Income (10,000)   (262,000)
Estimated Fair Value 115,959,000   179,211,000
Asset backed securities      
Available-for-sale securities      
Amortized Cost 48,394,000   77,661,000
Gains in Accumulated Other Comprehensive Income 27,000    
Losses in Accumulated Other Comprehensive Income (10,000)   (166,000)
Estimated Fair Value 48,411,000   77,495,000
U.S. government agency securities      
Available-for-sale securities      
Amortized Cost 4,558,000   7,057,000
Gains in Accumulated Other Comprehensive Income 12,000    
Losses in Accumulated Other Comprehensive Income     (18,000)
Estimated Fair Value 4,570,000   7,039,000
Certificates of deposit      
Available-for-sale securities      
Amortized Cost 3,500,000   1,999,000
Gains in Accumulated Other Comprehensive Income 1,000    
Estimated Fair Value 3,501,000   $ 1,999,000
Commercial paper      
Available-for-sale securities      
Amortized Cost 2,625,000    
Gains in Accumulated Other Comprehensive Income 1,000    
Estimated Fair Value $ 2,626,000