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Short-term Investments - Narrative (Details) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 USD ($) position | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) position | Jun. 30, 2020 USD ($)
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Realized gain on investments | $ 358,000 | $ 585,000 | $ 358,000 | $ 635,000
Realized loss on investments | 194,000 | 686,000 | 204,000 | 1,200,000
Unrealized gain (loss) on available-for-sale equity securities | $ 136,493 | $ 4,358,634 | $ (711,465) | $ (691,458)
Number of securities in a gross unrealized loss position | position | 22 |  | 22 |
Number of securities in a gross unrealized loss position for more than twelve months | position | 4 |  | 4 |
Unrealized loss |  |  | $ 211,000 |

X
- 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=124269663&loc=SL82922888-210455 + Details
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- Definition Amount of realized gain 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563 + Details
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- Definition Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(d)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117546-209714 + Details
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