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SIGNIFICANT ACCOUNTING POLICIES - Amortized cost basis, fair value and net unrealized gains of available-for-sale securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis $ 9,379 $ 34,957
Fair Value 9,330 34,954
Net Unrealized Loss (49) (3)
Municipal Obligations    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 9,379 30,996
Fair Value 9,330 30,996
Net Unrealized Loss (49)
Corporate Obligations    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost Basis 3,961
Fair Value 3,958
Net Unrealized Loss $ (3)