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v3.21.2

Short-term Investments (Tables) | 6 Months Ended
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Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract] |
Schedule of Summary of Investments | The following is a summary of available-for-sale securities as of June 30, 2021 and December 31, 2020:
|  |  | As of June 30, 2021
| Contractual Maturity (in years) | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Mutual funds | --- |  | $ | 207,475,699 |  |  | $ | 1,563,089 |  |  | $ | (579,056) |  |  | $ | 208,459,732 |
U.S. treasury securities | Less than 1 |  | 170,203,940 |  |  | 10,943 |  |  | (4,754) |  |  | 170,210,129 |
Certificates of deposit | Less than 1 |  | 2,972,816 |  |  | 25,684 |  |  | — |  |  | 2,998,500 |
U.S. agency mortgage-backed securities | * |  | 3,130,877 |  |  | 2,782 |  |  | (49,638) |  |  | 3,084,021 |
|  |  | $ | 383,783,332 |  |  | $ | 1,602,498 |  |  | $ | (633,448) |  |  | $ | 384,752,382 |
|  |  | As of December 31, 2020
| Contractual Maturity (in years) | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Mutual funds | --- |  | $ | 153,177,675 |  |  | $ | 2,339,639 |  |  | $ | (644,140) |  |  | $ | 154,873,174 |
Certificates of deposit | Less than 1 |  | 3,000,000 |  |  | 26,260 |  |  | (10,000) |  |  | 3,016,260 |
U.S. agency mortgage-backed securities | * |  | 3,062,256 |  |  | — |  |  | (36,755) |  |  | 3,025,501 |
Total investments |  |  | $ | 159,239,931 |  |  | $ | 2,365,899 |  |  | $ | (690,895) |  |  | $ | 160,914,935 |
*No single maturity date.

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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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