Fair Value Instruments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Asset included in:
Investments available-for-sale at fair value	$ 11,852,173	$ 25,410,222
U.S. Treasury Securities
Asset included in:
Investments available-for-sale at fair value	5,964,676	5,961,983
Corporate Debt Securities
Asset included in:
Investments available-for-sale at fair value	5,887,497	19,448,239
Fair Value, Measurements, Recurring
Asset included in:
Financial Assets	32,396,731	32,627,318
Fair Value, Measurements, Recurring | Money Market Securities
Asset included in:
Cash and cash equivalents	20,544,558	7,217,096
Fair Value, Measurements, Recurring | U.S. Treasury Securities
Asset included in:
Investments available-for-sale at fair value	5,964,676	5,961,983
Fair Value, Measurements, Recurring | Corporate Debt Securities
Asset included in:
Investments available-for-sale at fair value	5,887,497	19,448,239
Fair Value, Measurements, Recurring | Level 1
Asset included in:
Financial Assets	26,509,234	13,179,079
Fair Value, Measurements, Recurring | Level 1 | Money Market Securities
Asset included in:
Cash and cash equivalents	20,544,558	7,217,096
Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury Securities
Asset included in:
Investments available-for-sale at fair value	5,964,676	5,961,983
Fair Value, Measurements, Recurring | Level 2
Asset included in:
Financial Assets	5,887,497	19,448,239
Fair Value, Measurements, Recurring | Level 2 | Corporate Debt Securities
Asset included in:
Investments available-for-sale at fair value	$ 5,887,497	$ 19,448,239