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Stock-Based Compensation (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock available for grant 5,806,834    
Authorized to issue common stock in relation to stock options or restricted shares outstanding or available for grant 12,211,373    
Stock options outstanding 6,404,539 3,615,700 3,657,950
Stock options outstanding, weighted average exercise price $ 1.87 $ 0.67 $ 0.66
Stock options granted    50,000  
Non-cash compensation cost related to stock and stock options and restricted stock recognized $ 508,000 $ 562,000 $ 1,719,000
Total intrinsic value of options exercised 36,125 76,000 476,000
Cash received from exercise of stock options 63,000 35,000 232,000
Remaining weighted average contractual term for options exercisable 4 years 10 months 24 days    
Weighted average grant date fair value of common stock and restricted stock units granted $ 0.96 $ 2.18 $ 2.59
Total grant date fair value 350,000 429,000 379,000
Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost 22,000    
Total fair value of restricted stock units vested $ 378,000 $ 499,000 $ 1,584,000
Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options granted exercisable for varying periods, number of years 10 years