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Investments | 9 Months Ended
--- | ---
Sep. 30, 2019
Investments |
Investments | 3. Investments Investments consist of the following (in thousands):
|  | September 30, 2019
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Estimated
|  | Cost |  | Gain |  | Loss |  | Fair Value
U.S. treasury securities |  | $ | 19,982 |  | $ | 1 |  | $ | — |  | $ | 19,983
Agency bonds |  |  | 47,178 |  |  | — |  |  | (17) |  |  | 47,161
Corporate bonds |  |  | 107,045 |  |  | 20 |  |  | (62) |  |  | 107,003
Total |  | $ | 174,205 |  | $ | 21 |  | $ | (79) |  | $ | 174,147
As of September 30, 2019, no investments are considered to be other-than-temporarily impaired. The Company uses the specific identification method when calculating realized gains and losses. For the three and nine months ended September 30, 2019, the Company recorded no realized gains and losses on available-for-sale securities.

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