Fair Value Instruments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Asset included in:
Investments available-for-sale at fair value	$ 21,554,318	$ 25,410,222
U.S. Treasury Securities
Asset included in:
Investments available-for-sale at fair value	6,003,592	5,961,983
Corporate Debt Securities
Asset included in:
Investments available-for-sale at fair value	15,550,726	19,448,239
Fair Value, Measurements, Recurring
Asset included in:
Financial Assets	31,282,291	32,627,318
Fair Value, Measurements, Recurring | Money Market Securities
Asset included in:
Cash and cash equivalents	9,727,973	7,217,096
Fair Value, Measurements, Recurring | U.S. Treasury Securities
Asset included in:
Investments available-for-sale at fair value	6,003,592	5,961,983
Fair Value, Measurements, Recurring | Corporate Debt Securities
Asset included in:
Investments available-for-sale at fair value	15,550,726	19,448,239
Fair Value, Measurements, Recurring | Level 1
Asset included in:
Financial Assets	15,731,565	13,179,079
Fair Value, Measurements, Recurring | Level 1 | Money Market Securities
Asset included in:
Cash and cash equivalents	9,727,973	7,217,096
Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury Securities
Asset included in:
Investments available-for-sale at fair value	6,003,592	5,961,983
Fair Value, Measurements, Recurring | Level 2
Asset included in:
Financial Assets	15,550,726	19,448,239
Fair Value, Measurements, Recurring | Level 2 | Corporate Debt Securities
Asset included in:
Investments available-for-sale at fair value	$ 15,550,726	$ 19,448,239