Capital Lease Obligations - Summary of Capital Lease Obligations (Parenthetical) (Detail) - Capital lease obligations, imputed interest at 3.00% to 13.29% [Member] - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Imputed interest rate for capital lease obligation, minimum	3.00%	3.00%
Imputed interest rate for capital lease obligation, maximum	13.29%	13.29%
Monthly installment capital lease obligation	$ 6,000	$ 6,000
Debt instrument expiring date, description	expiring through November 2020