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Marketable Securities | 12 Months Ended
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Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | Marketable Securities Available-for-sale marketable securities as of December 31, 2019 and 2018 were as follows (in thousands):
| December 31, 2019 |  |  |  |  |  |
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Government-sponsored enterprises | $ | 13,216 |  |  | $ | 6 |  |  | $ | — |  |  | $ | 13,222 |
Corporate debt securities | 76,052 |  |  | 20 |  |  | (10) |  |  | 76,062 |
Total | $ | 89,268 |  |  | $ | 26 |  |  | $ | (10) |  |  | $ | 89,284 |
| December 31, 2018 |  |  |  |  |  |
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Corporate debt securities | $ | 12,738 |  |  | $ | — |  |  | $ | (3) |  |  | $ | 12,735 |
All of the Company's available-for-sale securities held at December 31, 2019 and 2018 had maturity dates of less than one year.
All available-for-sale securities in an unrealized loss position as of December 31, 2019 and 2018 were in a loss position for less than twelve months. There were no unrealized losses at December 31, 2019 or 2018 that the Company determined to be other-than-temporary. The Company recorded interest income of $3.4 million, $2.3 million and $2.4 million during the years ended December 31, 2019, 2018 and 2017, respectively, which is included in Other income (expense) on the consolidated statements of operations and comprehensive loss.

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