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Stock-Based Compensation (Schedule of Stock Options Activity) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Number Of Shares  
Balance outstanding at beginning of period, in shares 6,960
Granted, in shares 16
Forfeited or expired, in shares (37)
Exercised, in shares (18)
Balance outstanding at end of period, in shares 6,921
Exercisable, in shares 5,204
Vested and expected to vest, in shares 6,601
Weighted Average Exercise Price  
Balance outstanding at beginning of period, in dollars per share $ 2.55
Granted, in dollars per share $ 2.36
Forfeited or expired, in dollars per share $ 2.81
Exercised, in dollars per share $ 1.42
Balance outstanding at end of period, in dollars per share $ 2.55
Exercisable, in dollars per share $ 2.53
Vested and expected to vest, in dollars per share $ 2.55
Weighted Average Remaining Term  
Balance outstanding 6 years 1 month 17 days
Exercisable 5 years 0 months 22 days
Vested and expected to vest 6 years
Aggregate Intrinsic Value  
Balance outstanding $ 2,188
Exercisable 1,990
Vested and expected to vest $ 2,145