XML 37 R26.htm IDEA: XBRL DOCUMENT
v3.21.1

Short-term Investments (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Schedule of Summary of Investments | The following is a summary of available-for-sale securities as of March 31, 2021 and December 31, 2020:
|  |  | As of March 31, 2021
| Contractual Maturity (in years) | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Mutual funds | --- |  | $ | 228,101,615 |  |  | $ | 1,562,498 |  |  | $ | (714,957) |  |  | $ | 228,949,156 |
U.S. treasury securities | Less than 1 |  | 200,408,976 |  |  | 14,404 |  |  | (9,380) |  |  | 200,414,000 |
Certificates of deposit | Less than 1 |  | 2,977,623 |  |  | 19,700 |  |  | (5,123) |  |  | 2,992,200 |
U.S. agency mortgage-backed securities | * |  | 2,646,077 |  |  | 1,100 |  |  | (33,005) |  |  | 2,614,172 |
|  |  | $ | 434,134,291 |  |  | $ | 1,597,702 |  |  | $ | (762,465) |  |  | $ | 434,969,528 |
|  |  | 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.

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration