Income Taxes (Details)	Mar. 31, 2013 item
Net operating loss and tax credit carryforwards
Number of states in which the entity primarily operates or has operated and has income tax nexus	3

The number of states the entity operates in as of the balance sheet date.

No definition available.

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant