Significant Customer Concentration (Details) (Customer A [Member])	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Customer A [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue generated by single major customer (in hundredths)	10.00%	5.00%

Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues.

No definition available.

Name:	us-gaap_EntityWideRevenueMajorCustomerPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration