Annual report pursuant to Section 13 and 15(d)

401(k) Plan (Details)

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401(k) Plan (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Compensation and Retirement Disclosure [Abstract]      
Employer contributions to 401(k) plan $ 0 $ 0 $ 0
Minimum employee eligibility age (years) 18 years