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401(k) Plan (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Compensation and Retirement Disclosure [Abstract]      
Employer matching contribution, percent 50.00%    
Maximum annual contribution per employee, percent 6.00%    
Company's contribution to 401(k) plan $ 170,000 $ 134,000 $ 103,000