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MARKETABLE SECURITIES - Amortized cost basis, fair value and net unrealized gains on available-for-sale securities (Details 2) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis $ 11,188 $ 9,379
Fair Value 11,174 9,330
Net Unrealized Losses (14) (49)
Municipal Obligations    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 11,188 9,379
Fair Value 11,174 9,330
Net Unrealized Losses (14) (49)
Corporate Obligations    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis
Fair Value
Net Unrealized Losses