Stock-Based Compensation (Schedule of Stock Options Activity) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Number Of Shares
Balance outstanding at beginning of period, in shares	6,960
Granted, in shares	99
Forfeited or expired, in shares	(200)
Exercised, in shares	(34)
Balance outstanding at end of period, in shares	6,825
Exercisable, in shares	5,395
Vested and expected to vest, in shares	6,583
Weighted Average Exercise Price
Balance outstanding at beginning of period, in dollars per share	$ 2.55
Granted, in dollars per share	$ 2.32
Forfeited or expired, in dollars per share	$ 2.27
Exercised, in dollars per share	$ 1.40
Balance outstanding at end of period, in dollars per share	$ 2.56
Exercisable, in dollars per share	$ 2.54
Vested and expected to vest, in dollars per share	$ 2.56
Weighted Average Remaining Term
Balance outstanding	5 years 9 months 18 days
Exercisable	5 years 1 month 10 days
Vested and expected to vest	5 years 8 months 12 days
Aggregate Intrinsic Value
Balance outstanding	$ 1,533
Exercisable	1,527
Vested and expected to vest	$ 1,532