Marketable Securities and Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
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

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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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.

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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.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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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.

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