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Marketable Securities | 12 Months Ended
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Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | Marketable 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. All available-for-sale securities in an unrealized loss position as of December 31, 2018 and 2017 were in a loss position for less than twelve months. There were no unrealized losses at December 31, 2018 or 2017 that the Company determined to be other-than-temporary. The Company recorded interest income of $2.3 million, $2.4 million and $2.3 million during the years ended December 31, 2018, 2017 and 2016, respectively, which is included in other income (expense) on the consolidated statements of operations and comprehensive loss.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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