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SIGNIFICANT ACCOUNTING POLICIES - Amortized cost basis, fair value and net unrealized loss of the available-for-sale securities (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Marketable Securities:  
Amortized Cost Basis $ 7,674
Fair Value 7,665
Net Unrealized Loss (9)
Municipal Obligations  
Marketable Securities:  
Amortized Cost Basis 1,490
Fair Value 1,490
Corporate Obligations  
Marketable Securities:  
Amortized Cost Basis 6,184
Fair Value 6,175
Net Unrealized Loss $ (9)