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Marketable Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Short-term [1] $ 4,352 $ 5,878
Long-term - security bond [2] 105 544
Municipal bond [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Short-term [1] 3,325 4,806
Corporate bond [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Short-term [1] $ 1,027 $ 1,072
[1] The Company invests in highly-rated marketable securities, and its policy limits the amount of credit exposure to any one issuer. The Company's investment policy requires investments to be investment grade, rated single - A or better, with the objective of minimizing the potential risk of principal loss. Fair values were determined for each individual security in the investment portfolio based on quoted prices in active markets.
[2] As of December 31, 2018 the Company held a long-term security bond which is classified as available-for-sale security and presented at fair value. The fair value of the available-for-sale security based on quoted prices in active markets for identical instruments (Level 1 as defined under ASC 820, "Fair Value Measurement").