Stockholders' Equity - Summary of Reconciliation of Warrants to Purchase Share of the Company's Common Stock (Detail) - $ / shares	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Stockholders Equity Note [Abstract]
Number of Warrants, Outstanding and exercisable, Beginning balance	486,812	0
Number of Warrants, Issued	0	486,812
Number of Warrants, Outstanding and exercisable, Ending balance	486,812	486,812
Weighted Average Exercise Price, Outstanding and exercisable, Beginning balance	$ 1.23	$ 0
Weighted Average Exercise Price, Issued	0	1.23
Weighted Average Exercise Price, Outstanding and exercisable, Ending balance	$ 1.23	$ 1.23