Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities - Schedule of Marketable Securities (Detail)

v3.7.0.1
Marketable Securities - Schedule of Marketable Securities (Detail) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Marketable Securities, Fair Value $ 16,829,854 $ 31,354,170
Corporate Debt [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Marketable Securities, Amortized Cost 16,849,153 31,405,836
Marketable Securities, Unrealized Gains   24
Marketable Securities, Unrealized Losses (19,299) (51,690)
Marketable Securities, Fair Value $ 16,829,854 $ 31,354,170