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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").

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