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Investments | 9 Months Ended
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Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract] |
Investments | Investments Investments at September 30, 2019 consisted of mutual funds. Investments at December 31, 2018 consisted of mutual funds and United States corporate debt securities. Investments are recorded at fair value, based on current market valuations. Unrealized gains and losses on the Company's debt securities will continue to be excluded from earnings and are reported as a separate component of other comprehensive loss until realized. Realized gains and losses are included in non-operating other income (expense) on the condensed consolidated statements of operations and are derived using the specific identification method for determining the cost of the securities sold. During the three and nine months ended September 30, 2019, $145,000 and $238,000, respectively, of net realized gain on investments was recorded. During the three and nine months ended September 30, 2018, $(184,000) and $(558,000), respectively, of net realized loss on investments was recorded. Interest and dividends on investments classified as available-for-sale are included in interest income in the condensed consolidated statements of operations. As of September 30, 2019, the Company had no available-for-sale securities in an unrealized loss position for longer than 12 months. The following is a summary of available-for-sale securities as of September 30, 2019 and December 31, 2018:
|  |  | As of September 30, 2019
| Contractual Maturity (in years) | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Mutual funds | --- |  | $ | 76,910,152 |  |  | $ | 1,038,733 |  |  | $ | (3,132 | ) |  | $ | 77,945,753 |
|  |  | As of December 31, 2018
| Contractual Maturity (in years) | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Mutual funds | --- |  | $ | 57,842,955 |  |  | $ | — |  |  | $ | (528,084 | ) |  | $ | 57,314,871 |
US corporate debt securities | Less than 2 |  | 224,633 |  |  | — |  |  | (652 | ) |  | 223,981 |
Total investments |  |  | $ | 58,067,588 |  |  | $ | — |  |  | $ | (528,736 | ) |  | $ | 57,538,852 |

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