Fair Value Instruments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Cash and Cash Equivalents | Money Market Securities
Asset included in:
Financial Assets	$ 6,881,027	$ 3,290,490
Investments Available-for-sale at Fair Value | U.S. Government Obligations
Asset included in:
Financial Assets	3,306,298	3,298,014
Investments Available-for-sale at Fair Value | U.S. Government Agency Obligations
Asset included in:
Financial Assets	5,899,598	14,589,378
Investments Available-for-sale at Fair Value | Corporate Debt Securities
Asset included in:
Financial Assets	6,199,518	12,918,016
Level 1 | Cash and Cash Equivalents | Money Market Securities
Asset included in:
Financial Assets	6,881,027	3,290,490
Level 1 | Investments Available-for-sale at Fair Value | U.S. Government Obligations
Asset included in:
Financial Assets	3,306,298	3,298,014
Level 2 | Investments Available-for-sale at Fair Value | U.S. Government Agency Obligations
Asset included in:
Financial Assets	5,899,598	14,589,378
Level 2 | Investments Available-for-sale at Fair Value | Corporate Debt Securities
Asset included in:
Financial Assets	$ 6,199,518	$ 12,918,016