Business Concentration - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Purchases [Member]
Concentration risk percentage	10.00%		10.00%	10.00%
Customers One [Member]
Concentration risk percentage	47.00%	16.00%
Customers One [Member] | Purchases [Member]
Concentration risk percentage		13.00%
Customers One [Member] | Sales Revenue, Net [Member]
Concentration risk percentage	26.00%	19.00%
Customers Two [Member]
Concentration risk percentage			13.00%	14.00%
Customers Two [Member] | Purchases [Member]
Concentration risk percentage		11.00%
Customers Two [Member] | Sales Revenue, Net [Member]
Concentration risk percentage			14.00%	14.00%