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Marketable Securities and Fair Value Measurements - Narrative (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Marketable Securities and Fair Value Measurements (Textual) [Abstract]
Derivative liability	$ 4,503,918	$ 0
Using Quoted Prices in Active Markets for Identical Assets (Level 1)
Marketable Securities and Fair Value Measurements (Textual) [Abstract]
Number of shares held in an affiliated entity (in shares)	1,644,155
Using Quoted Prices in Active Markets for Identical Assets (Level 1) | Common stock
Marketable Securities and Fair Value Measurements (Textual) [Abstract]
Investment owned (in shares)	395,758
Fair Value, Inputs, Level 3
Marketable Securities and Fair Value Measurements (Textual) [Abstract]
Derivative liability	$ 7,100,000

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Marketable securities and fair value measurements.

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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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Balance held at close of period in number of shares.

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