Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - CASH AND CASH EQUIVALENTS (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - CASH AND CASH EQUIVALENTS (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 99,631 $ 104,914 $ 59,866 $ 44,816
Cash        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 41,175 47,431    
Available-for-Sale Investments        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 58,456 $ 57,483