Description of Business - Additional Information (Detail)	Dec. 31, 2012
Product Information [Line Items]
Sales Revenue, Goods, Net, Percentage	10.00%

The percentage of net product revenue to total net revenue from the sale of goods as of year end.

No definition available.

Name:	us-gaap_SalesRevenueGoodsNetPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant