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Commitments and Contingencies (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Commitments and Contingencies Disclosure [Abstract]      
401(k) plan, minimum eligibility age 18 years    
401(k) plan, requisite service period 6 months    
401(k) plan, maximum annual contribution per employee, percent 100.00%    
401(k) plan, employer's matching contribution, annual vesting percentage 20.00%    
401(k) plan, employer contribution, ultimate vesting percentage 100.00%    
401(k) plan, employer's matching contribution, vesting term 6 years    
401(k) plan, employer contribution amount $ 282,710 $ 410,000 $ 185,000
Operating leases, maximum term 5 years    
Operating leases, rent expense $ 453,000 $ 450,000 $ 526,000