Concentrations - Additional Information (Detail)	9 Months Ended	12 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2014 Account Receivable	Dec. 31, 2013 Account Receivable	Sep. 30, 2014 Customer Concentration Risk Revenue	Sep. 30, 2013 Customer Concentration Risk Revenue	Sep. 30, 2014 Customer Concentration Risk Revenue	Sep. 30, 2013 Customer Concentration Risk Revenue
Concentration Risk [Line Items]
Maximum revenue and account receivable with individual customer	Less than 10%	Less than 10%	Less than 10%	Less than 10%	Less than 10%	Less than 10%