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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Detail Textuals) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash equivalents, which primarily include money market funds $ 51,913 $ 51,232 $ 43,985 $ 72,660
Fair value on recurring basis | Corporate debt securities | Fair Value Measurement, Quoted Prices in Active Markets for Identical Assets (Level 1)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale investments 951 869    
Fair value on recurring basis | Money market funds (included in cash and cash equivalents) | Fair Value Measurement, Quoted Prices in Active Markets for Identical Assets (Level 1)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash equivalents, which primarily include money market funds $ 49,800 $ 43,000