Available-for-Sale Securities - Summary of Available-for-sale Securities (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 27,621,913
Gross Unrealized Losses	(8,882)
Fair Value (Net Carrying Amount)	27,613,031	$ 0
U.S. Treasury Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	10,002,727
Gross Unrealized Losses	(7,627)
Fair Value (Net Carrying Amount)	9,995,100
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	17,619,186
Gross Unrealized Losses	(1,255)
Fair Value (Net Carrying Amount)	$ 17,617,931