Cash, Cash Equivalents and Short-Term Investments - Available-for-Sale Investments (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Amortized Cost	$ 21,121,659	$ 7,902,393
Unrealized Gains	26,552	23,582
Unrealized Losses	(54,111)
Fair Value	21,094,100	7,925,975
U.S. Treasury bills
Amortized Cost	21,121,659	2,948,777
Unrealized Gains	26,552	19,523
Unrealized Losses	(54,111)
Fair Value	$ 21,094,100	2,968,300
U.S. Treasury notes
Amortized Cost		4,953,616
Unrealized Gains		4,059
Fair Value		$ 4,957,675