401(k) Plan (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Compensation and Retirement Disclosure [Abstract]
401(k) plan, employer contributions	$ 0	$ 0

Amount of discretionary contributions made by an employer to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration