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Available-for-sale debt securities | 3 Months Ended
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Mar. 31, 2019
Available-for-sale debt securities |
Available-for-sale debt securities | Note 7 — Available-for-sale debt securities As of March 31, 2019, the Company has the following investments in available-for-sale debt securities (in thousands):
|  |  |  |  |  |  | Gross |  | Gross |  | Aggregate
|  |  |  | Amortized |  | Unrealized |  | Unrealized |  | Estimated
|  | Maturity |  | cost |  | Gains |  | Losses |  | Fair Value
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  | Less than 3 months |  | $ | 7,990 |  | $ | — |  | $ | — |  | $ | 7,990
|  |  |  | $ | 7,990 |  | $ | — |  | $ | — |  | $ | 7,990
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  | 3 months to 1 year |  | $ | 109,203 |  | $ | 64 |  | $ | (15) |  | $ | 109,252
Agency bond |  | 3 months to 1 year |  |  | 3,990 |  |  | 5 |  |  | — |  |  | 3,995
Treasury bills |  | 3 months to 1 year |  |  | 1,992 |  |  | — |  |  | — |  |  | 1,992
Certificate of deposit |  | 3 months to 1 year |  |  | 3,002 |  |  | — |  |  | — |  |  | 3,002
|  |  |  | $ | 118,187 |  | $ | 69 |  | $ | (15) |  | $ | 118,241
In the three months ended March 31, 2019, there were no realized losses recognized on the maturity of available-for-sale debt securities. As of March 31, 2019 and December 31, 2018, the aggregate fair value of securities held by the Company in an unrealized loss position was $49,567,000 and $117,179,000, respectively, which consisted of 15 and 37 securities, respectively. No securities have been in an unrealized loss position for more than one year. As of March 31, 2019, the securities in an unrealized loss position are not considered to be other than temporarily impaired because the impairments are not severe, have been for a short duration and are due to normal market fluctuations. Furthermore, the Company does not intend to sell the debt securities in an unrealized loss position and it is unlikely that the Company will be required to sell these securities before the recovery of the amortized cost.

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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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