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Investments - Summary of Available-for-sale Securities (Details) - USD ($) | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2015
Debt Securities, Available-for-sale [Abstract] |  |  |
Cost | $ 81,107,750 |  |
Gross Unrealized Losses | (598,386) |  |
Gross Unrealized Gains | 2,667,805 | $ 2,325,079 |
Fair Market Value | 83,177,169 |  |
Cost |  | 0 | $ 0
Gross Unrealized Gains |  | 2,325,079 |
Gross Unrealized Losses |  | 0 |
Fair Market Value |  | 2,325,079 |
Cost |  | 103,986,286 |
Gross Unrealized Gains |  | 2,370,208 |
Gross Unrealized Losses |  | (392,571) |
Fair Market Value |  | 105,963,923 |
Mutual funds |  |  |
Debt Securities, Available-for-sale [Abstract] |  |  |
Cost | 69,855,486 | 68,776,165 |
Gross Unrealized Gains | 0 | 42,097 |
Gross Unrealized Losses | (532,970) | (252,373) |
Fair Market Value | 69,322,516 | 68,565,889 |
US corporate debt securities |  |  |
Debt Securities, Available-for-sale [Abstract] |  |  |
Cost | 11,252,264 | 35,210,121 |
Gross Unrealized Gains | 0 | 3,032 |
Gross Unrealized Losses | (65,416) | (140,198) |
Fair Market Value | $ 11,186,848 | $ 35,072,955 |
Maximum | US corporate debt securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Contractual maturity, less than | 2 years | 2 years |

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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=82897076&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=82897076&loc=d3e27161-111563 + Details
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