Investments - Summary of Amortized Cost, Unrealized Gains and Fair Value of Short-term Investments (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 46,661,171	$ 47,592,763
Unrealized Gain	12,222	9,046
Unrealized Loss	(7,923)	(15,476)
Fair Value	46,665,470	47,586,333
Corporate Bonds and Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	46,661,171	47,091,593
Unrealized Gain	12,222	9,036
Unrealized Loss	(7,923)	(15,476)
Fair Value	46,665,470	47,085,153
US Government and Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		501,170
Unrealized Gain		10
Unrealized Loss
Fair Value		$ 501,180