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Marketable Securities and Certificates of Deposit - Scheduled Maturities of Available-for-Sale Debt Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Investments, Debt and Equity Securities [Abstract] |  |
Due within one year, amortized cost | $ 618 | $ 391
Due after one year through five years, amortized cost | 1,315 | 1,231
Debt Securities, Available-for-sale, Amortized Cost | 1,933 | 1,622
Due within one year, fair value | 620 | 391
Due after one year through five years, fair value | 1,348 | 1,241
Total, fair value | $ 1,968 | $ 1,632

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