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Short-term Investments - Summary of Available-for-sale Securities (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Debt Securities, Available-for-sale [Abstract] |  |  |
Cost | $ 434,134,291 |  | $ 159,239,931
Gross Unrealized Gains | 1,597,702 |  | 2,365,899
Gross Unrealized Losses | (762,465) |  | (690,895)
Fair Market Value | 434,969,528 |  | 160,914,935
Mutual funds |  |  |
Debt Securities, Available-for-sale [Abstract] |  |  |
Cost | 228,101,615 |  | 153,177,675
Gross Unrealized Gains | 1,562,498 |  | 2,339,639
Gross Unrealized Losses | (714,957) |  | (644,140)
Fair Market Value | $ 228,949,156 |  | 154,873,174
U.S. treasury securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Contractual maturity (less than) | 1 year |  |
Debt Securities, Available-for-sale [Abstract] |  |  |
Cost | $ 200,408,976 |  |
Gross Unrealized Gains | 14,404 |  |
Gross Unrealized Losses | (9,380) |  |
Fair Market Value | $ 200,414,000 |  |
Certificates of deposit |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Contractual maturity (less than) | 1 year | 1 year |
Debt Securities, Available-for-sale [Abstract] |  |  |
Cost | $ 2,977,623 |  | 3,000,000
Gross Unrealized Gains | 19,700 |  | 26,260
Gross Unrealized Losses | (5,123) |  | (10,000)
Fair Market Value | 2,992,200 |  | 3,016,260
U.S. agency mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Abstract] |  |  |
Cost | 2,646,077 |  | 3,062,256
Gross Unrealized Gains | 1,100 |  | 0
Gross Unrealized Losses | (33,005) |  | (36,755)
Fair Market Value | $ 2,614,172 |  | $ 3,025,501

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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