Warrants - Additional Information (Detail) - USD ($)		6 Months Ended
	Dec. 04, 2017	Jun. 30, 2018
Class Of Warrant Or Right [Line Items]
Proceeds from warrants exercised		$ 3,556,391
FPO [Member]
Class Of Warrant Or Right [Line Items]
Warrants issued	1,205,556
Proceeds from warrants exercised		$ 3,556,400