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Investments | 9 Months Ended
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Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
Investments | 4. Investments The following is a summary of investments as of September 30, 2018 and December 31, 2017. The Company considered all investments as available for sale.
|  | As of September 30, 2018 |
|  | Adjusted Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
Municipal securities |  | $ | 69,192 |  |  | $ | — |  |  | $ | (438 | ) |  | $ | 68,754 |
Total investments |  | $ | 69,192 |  |  | $ | — |  |  | $ | (438 | ) |  | $ | 68,754 |
|  | As of December 31, 2017 |
|  | Adjusted Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
Municipal securities |  | $ | 84,768 |  |  | $ | — |  |  | $ | (409 | ) |  | $ | 84,359 |
Certificates of Deposit |  | $ | 4,915 |  |  | $ | — |  |  | $ | (3 | ) |  | $ | 4,912 |
Total investments |  | $ | 89,683 |  |  | $ | — |  |  | $ | (412 | ) |  | $ | 89,271 |
The cash flows of municipal securities are backed by the issuing municipality’s credit worthiness. All municipal securities are due in one year or less as of September 30, 2018. For the nine months ended September 30, 2018, the net unrealized losses on available-for-sale securities was $329, net of taxes.

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