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Summary of Significant Accounting Policies - Schedule of Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value of Marketable Securities | $ 18,765 |
Level 1 [Member] |  |
Fair Value of Marketable Securities |  |
Level 2 [Member] |  |
Fair Value of Marketable Securities | 18,765 |
Level 3 [Member] |  |
Fair Value of Marketable Securities |  |
U.S. Government Obligations [Member] |  |
Fair Value of Marketable Securities | 1,744 |
U.S. Government Obligations [Member] | Level 1 [Member] |  |
Fair Value of Marketable Securities |  |
U.S. Government Obligations [Member] | Level 2 [Member] |  |
Fair Value of Marketable Securities | 1,744 |
U.S. Government Obligations [Member] | Level 3 [Member] |  |
Fair Value of Marketable Securities |  |
Corporate Obligations [Member] |  |
Fair Value of Marketable Securities | 17,021 |
Corporate Obligations [Member] | Level 1 [Member] |  |
Fair Value of Marketable Securities |  |
Corporate Obligations [Member] | Level 2 [Member] |  |
Fair Value of Marketable Securities | 17,021 |
Corporate Obligations [Member] | Level 3 [Member] |  |
Fair Value of Marketable Securities |  |

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