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Investments - Summary of Available-for-sale Securities (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Debt Securities, Available-for-sale [Abstract] |  |
Cost | $ 106,708,394 | $ 58,067,588
Gross Unrealized Gains | 539,546 | 0
Gross Unrealized Losses | (31,442) | (528,736)
Fair Market Value | 107,216,498 | 57,538,852
Mutual funds |  |
Debt Securities, Available-for-sale [Abstract] |  |
Cost | 106,483,816 | 57,842,955
Gross Unrealized Gains | 539,170 | 0
Gross Unrealized Losses | (31,229) | (528,084)
Fair Market Value | 106,991,757 | 57,314,871
US corporate debt securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Cost | 224,578 | 224,633
Gross Unrealized Gains | 376 | 0
Gross Unrealized Losses | (213) | (652)
Fair Market Value | $ 224,741 | $ 223,981
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 Amortized cost of 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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