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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Available-For-Sale Securities | Available-for-sale marketable securities as of December 31, 2018 and 2017 were as follows (in thousands):
| December 31, 2018 |  |  |  |  |  |
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Corporate debt securities | $ | 12,738 |  | $ | — |  | $ | (3) |  | $ | 12,735
| December 31, 2017 |  |  |  |  |  |
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. Treasury securities | $ | 3,995 |  | $ | — |  | $ | (6) |  | $ | 3,989
Government-sponsored enterprises | 11,998 |  | — |  | (7) |  | 11,991
Corporate debt securities | 77,462 |  | 2 |  | (50) |  | 77,414
Total | $ | 93,455 |  | $ | 2 |  | $ | (63) |  | $ | 93,394
All of the Company's available-for-sale securities held at December 31, 2018 and 2017 had maturity dates of less than one year.

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References No definition available. + Details
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- References No definition available. + Details
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