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Short-term Investments - Narrative (Details) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 USD ($) investment | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) investment | Jun. 30, 2019 USD ($)
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Realized gain on investments | $ 585,000 | $ 157,000 | $ 635,000 | $ 175,000
Realized loss on investments | 686,000 | 29,000 | 1,200,000 | 82,000
Net unrealized gain (loss) on available-for-sale equity securities | $ 4,358,634 | $ 0 | $ (691,458) | $ 0
Number of securities in a gross unrealized loss position | investment | 16 |  | 16 |
Number of securities in a gross unrealized loss position for more than twelve months | investment | 0 |  | 0 |

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- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without an allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922888-210455 + Details
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