Fair Value - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Cash and Cash Equivalents | Money Market Securities
Asset included in:
Financial Assets	$ 6,443,102	$ 3,290,490
Investments Available-for-sale at Fair Value | U.S. Government Obligations
Asset included in:
Financial Assets	1,300,663	3,298,014
Investments Available-for-sale at Fair Value | Corporate Debt Securities
Asset included in:
Financial Assets	3,004,238	12,918,016
Investments Available-for-sale at Fair Value | U.S. Government Agency Obligations
Asset included in:
Financial Assets		14,589,378
Level 1 | Cash and Cash Equivalents | Money Market Securities
Asset included in:
Financial Assets	6,443,102	3,290,490
Level 1 | Investments Available-for-sale at Fair Value | U.S. Government Obligations
Asset included in:
Financial Assets	1,300,663	3,298,014
Level 2 | Investments Available-for-sale at Fair Value | Corporate Debt Securities
Asset included in:
Financial Assets	$ 3,004,238	12,918,016
Level 2 | Investments Available-for-sale at Fair Value | U.S. Government Agency Obligations
Asset included in:
Financial Assets		$ 14,589,378