XML 28 R32.htm IDEA: XBRL DOCUMENT v3.2.0.727
Investments - Summary of Amortized Cost, Unrealized Gains and Fair Value of Short-term Investments (Detail) - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 67,700,757 $ 42,802,547
Unrealized Gain 17,714 4,883
Unrealized Loss (17,416) (15,880)
Fair Value 67,701,055 42,791,550
Corporate Bonds and Notes [Member] | Short-term Investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 67,700,757 42,011,286
Unrealized Gain 17,714 4,883
Unrealized Loss (17,416) (13,387)
Fair Value $ 67,701,055 42,002,782
Corporate Bonds and Notes [Member] | Long-term Investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   791,261
Unrealized Loss   (2,493)
Fair Value   $ 788,768