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v3.19.3

Investments (Tables) | 9 Months Ended
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Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract] |
Summary of available-for-sale securities | 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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- 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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