Income Taxes - Schedule of Reconciliation of Tax Provision with Expected Provision (Detail) (Parenthetical) - USD ($)	1 Months Ended	12 Months Ended
	Oct. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Income Tax [Line Items]
Initial public stock offering			$ 9,688,196
Initial Public Offering [Member]
Income Tax [Line Items]
Initial public stock offering	$ 9,688,000	$ 3,681,349	$ 166,711