Fair Value Instruments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Asset included in:
Financial Assets	$ 42,595,283	$ 8,521,054
Cash and Cash Equivalents | Money Market Securities
Asset included in:
Financial Assets	17,470,074	8,521,054
Investments Available-for-sale at Fair Value | U.S. Government Obligations
Asset included in:
Financial Assets	9,943,245
Investments Available-for-sale at Fair Value | Corporate Debt Securities
Asset included in:
Financial Assets	15,181,964
Level 1
Asset included in:
Financial Assets	27,413,319	8,521,054
Level 1 | Cash and Cash Equivalents | Money Market Securities
Asset included in:
Financial Assets	17,470,074	$ 8,521,054
Level 1 | Investments Available-for-sale at Fair Value | U.S. Government Obligations
Asset included in:
Financial Assets	9,943,245
Level 2
Asset included in:
Financial Assets	15,181,964
Level 2 | Investments Available-for-sale at Fair Value | Corporate Debt Securities
Asset included in:
Financial Assets	$ 15,181,964