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Marketable Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Short-term marketable securities | [1] | $ 1,916 | $ 4,352
Long-term marketable security - bond | [2] | 129 | 105
Municipal bond [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Short-term marketable securities | [1] | 1,346 | 3,325
Corporate bond [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Short-term marketable securities | [1] | $ 570 | $ 1,027
[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 BBB- 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, 2019 and 2018, the Company held a long-term bond which is classified as available-for-sale security and presented at fair value. The fair value of the available-for-sale security is based on quoted prices in active markets for identical instruments (Level 1 as defined under ASC 820, "Fair Value Measurement").

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