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Marketable Securities and Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - USD ($) | Sep. 30, 2019 | Dec. 31, 2018
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Financial assets and liabilities that are measured at fair value on recurring basis |  |
US corporate debt securities |  | $ 57,538,852
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative liability (Note 9) | $ 4,503,918 | 0
Significant Unobservable Inputs (Level 3) |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative liability (Note 9) | 7,100,000 |
Mutual funds |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
US corporate debt securities | 77,945,753 | 57,314,871
Fair Value, Measurements, Recurring |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
US corporate debt securities |  | 223,981
Investment in affiliated entities | 7,996,757 | 9,405,913
Total assets | 89,259,972 | 76,591,272
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative liability (Note 9) | 4,503,918 |
Total liabilities | 4,503,918 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
US corporate debt securities |  | 0
Investment in affiliated entities | 7,996,757 | 9,405,913
Total assets | 11,314,219 | 19,052,420
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative liability (Note 9) | 0 |
Total liabilities | 0 |
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
US corporate debt securities |  | 223,981
Investment in affiliated entities | 0 | 0
Total assets | 77,945,753 | 57,538,852
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative liability (Note 9) | 0 |
Total liabilities | 0 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
US corporate debt securities |  | 0
Investment in affiliated entities | 0 | 0
Total assets | 0 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative liability (Note 9) | 4,503,918 |
Total liabilities | 4,503,918 |
Fair Value, Measurements, Recurring | Money market funds |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Cash and cash equivalents, fair value | 3,317,462 | 9,646,507
Fair Value, Measurements, Recurring | Money market funds | Quoted Prices in Active Markets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Cash and cash equivalents, fair value | 3,317,462 | 9,646,507
Fair Value, Measurements, Recurring | Money market funds | Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Cash and cash equivalents, fair value | 0 | 0
Fair Value, Measurements, Recurring | Money market funds | Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Cash and cash equivalents, fair value | 0 | 0
Fair Value, Measurements, Recurring | Mutual funds |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Cash and cash equivalents, fair value | 77,945,753 | 57,314,871
Fair Value, Measurements, Recurring | Mutual funds | Quoted Prices in Active Markets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Cash and cash equivalents, fair value | 0 | 0
Fair Value, Measurements, Recurring | Mutual funds | Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Cash and cash equivalents, fair value | 77,945,753 | 57,314,871
Fair Value, Measurements, Recurring | Mutual funds | Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Cash and cash equivalents, fair value | $ 0 | $ 0

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount 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 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + Details
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- Definition Amount of 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 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References No definition available. + Details
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