Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Cash denominated in foreign currencies, proceeds	$ (1,736,101)	$ 1,279,677
Cash denominated in foreign currencies, cost	1,726,375	$ 1,263,916
Uncertain tax position	$ 0
Open tax year	2015 2016 2017 2018