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Investments (Tables) | 6 Months Ended
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Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract] |
Summary of investments | The following is a summary of available-for-sale securities as of June 30, 2017 and December 31, 2016:
|  |  | As of June 30, 2017
| Contractual Maturity (in years) | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Mutual funds | --- |  | $ | 43,085,855 |  |  | $ | 194,051 |  |  | $ | (212,400 | ) |  | $ | 43,067,506 |
US corporate debt securities | Less than 2 |  | 25,118,191 |  |  | 6,967 |  |  | (54,045 | ) |  | 25,071,113 |
Investment in affiliated entity (PLS) | --- |  | — |  |  | 3,339,802 |  |  | — |  |  | 3,339,802 |
Total investments |  |  | $ | 68,204,046 |  |  | $ | 3,540,820 |  |  | $ | (266,445 | ) |  | $ | 71,478,421 |
|  |  | As of December 31, 2016
| Contractual Maturity (in years) | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Mutual funds | --- |  | $ | 60,883,065 |  |  | $ | 94,374 |  |  | $ | (387,693 | ) |  | $ | 60,589,746 |
US corporate debt securities | Less than 2 |  | 25,098,122 |  |  | 6,853 |  |  | (65,309 | ) |  | 25,039,666 |
Investment in affiliated entity (PLS) | --- |  | — |  |  | 3,777,510 |  |  | — |  |  | 3,777,510 |
Total investments |  |  | $ | 85,981,187 |  |  | $ | 3,878,737 |  |  | $ | (453,002 | ) |  | $ | 89,406,922 |

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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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