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Investments (Tables) | 12 Months Ended
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Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract] |
Summary of investments | The following is a summary of available-for-sale securities as of December 31, 2016 and 2015:
|  |  | 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 |
|  |  | As of December 31, 2015
| Contractual Maturity (in years) | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Mutual funds | --- |  | $ | 78,571,294 |  |  | $ | 435 |  |  | $ | (185,737 | ) |  | $ | 78,385,992 |
US corporate debt securities | Less than 2 |  | 26,923,855 |  |  | — |  |  | (54,452 | ) |  | 26,869,403 |
Municipal bonds | Less than 1 |  | 101,936 |  |  | — |  |  | (54 | ) |  | 101,882 |
Investment in affiliated entity (PLS) | --- |  | — |  |  | 5,045,915 |  |  | — |  |  | 5,045,915 |
Total investments |  |  | $ | 105,597,085 |  |  | $ | 5,046,350 |  |  | $ | (240,243 | ) |  | $ | 110,403,192 |

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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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