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Marketable Securities and Certificates of Deposit - Scheduled Maturities of Available-for-Sale Debt Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Investments, Debt and Equity Securities [Abstract] |  |
Due within one year, amortized cost | $ 391 | $ 204
Due after one year through five years, amortized cost | 1,231 | 1,602
Total, amortized cost | 1,622 | 1,806
Due within one year, fair value | 391 | 204
Due after one year through five years, fair value | 1,241 | 1,591
Total, fair value | $ 1,632 | $ 1,795

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