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Investments (Tables) | 6 Months Ended
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Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
Summary of investments | The following is a summary of available-for-sale securities as of June 30, 2018 and December 31, 2017:
|  |  | As of June 30, 2018
| Contractual Maturity (in years) | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Mutual funds | --- |  | $ | 69,855,486 |  |  | $ | — |  |  | $ | (532,970 | ) |  | $ | 69,322,516 |
US corporate debt securities | Less than 2 |  | 11,252,264 |  |  | — |  |  | (65,416 | ) |  | 11,186,848 |
Investment in affiliated entity (PLS) | --- |  | — |  |  | 2,667,805 |  |  | — |  |  | 2,667,805 |
Total investments |  |  | $ | 81,107,750 |  |  | $ | 2,667,805 |  |  | $ | (598,386 | ) |  | $ | 83,177,169 |
|  |  | As of December 31, 2017
| Contractual Maturity (in years) | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Mutual funds | --- |  | $ | 68,776,165 |  |  | $ | 42,097 |  |  | $ | (252,373 | ) |  | $ | 68,565,889 |
US corporate debt securities | Less than 2 |  | 35,210,121 |  |  | 3,032 |  |  | (140,198 | ) |  | 35,072,955 |
Investment in affiliated entity (PLS) | --- |  | — |  |  | 2,325,079 |  |  | — |  |  | 2,325,079 |
Total investments |  |  | $ | 103,986,286 |  |  | $ | 2,370,208 |  |  | $ | (392,571 | ) |  | $ | 105,963,923 |

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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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