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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
Sep. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis $ 13,485 $ 9,379
Fair Value 13,506 9,330
Net Unrealized Gains (Losses) 21 (49)
Municipal Obligations    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 13,485 9,379
Fair Value 13,506 9,330
Net Unrealized Gains (Losses) 21 (49)
Corporate Obligations    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 0 0
Fair Value 0 0
Net Unrealized Gains (Losses) $ 0 $ 0