Concentrations - Additional Information (Detail) - Product Concentration Risk - Customer	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Concentration Risk [Line Items]
Number of customers which represented more than 10% of the Company's accounts receivable			0		0
Sales Revenue, Net
Concentration Risk [Line Items]
Number of customers which represented more than 10% of the Company's revenue	0	0	0	0
Concentration Risk Percentage	100.00%	100.00%	100.00%	100.00%
Account Receivable
Concentration Risk [Line Items]
Concentration Risk Percentage			10.00%		10.00%
Minimum | Sales Revenue, Net
Concentration Risk [Line Items]
Concentration Risk Percentage	10.00%	10.00%	10.00%	10.00%