Major Customers - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2013 Customer	Dec. 31, 2012 Customer
Major Customers [Line Items]
Number of customers	1	3
Customer 1 [Member]
Major Customers [Line Items]
Customers accounted from total revenue	87.20%	30.30%
Customer 2 [Member]
Major Customers [Line Items]
Customers accounted from total revenue		28.50%
Customer 3 [Member]
Major Customers [Line Items]
Customers accounted from total revenue		28.80%