Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities - Schedule of Marketable Securities (Detail)

v3.19.2
Marketable Securities - Schedule of Marketable Securities (Detail) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]    
Marketable Securities, Amortized Cost   $ 22,162,236
Marketable Securities, Unrealized Gains   860
Marketable Securities, Unrealized Losses   (31,160)
Marketable Securities, Fair Value   22,131,936
Corporate Debt [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Marketable Securities, Amortized Cost $ 6,849,519 19,179,530
Marketable Securities, Unrealized Gains 2,830 314
Marketable Securities, Unrealized Losses (834) (31,160)
Marketable Securities, Fair Value $ 6,851,515 19,148,684
US Treasury Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Marketable Securities, Amortized Cost   2,982,706
Marketable Securities, Unrealized Gains   546
Marketable Securities, Fair Value   $ 2,983,252