Stock-Based Compensation (Summary of Option Activity)(Details) (USD $)	9 Months Ended
	Sep. 30, 2012
Number of Shares
Shares available for grant at September 30, 2012	5,559,536
2005 Stock Incentive Plan [Member]
Number of Shares
Outstanding at January 1, 2012	7,412,746
Granted	3,483,000
Exercised	(80,784)
Canceled	(1,546,562)
Outstanding at September 30, 2012	9,268,400
Shares exercisable at September 30, 2012	3,503,043
Weighted Average Exercise Price
Outstanding at January 1, 2012	$ 2.22
Granted	$ 1.29
Exercised	$ 0.61
Canceled	$ 2.26
Outstanding at September 30, 2012	$ 1.88
Options exercisable, September 30, 2012	$ 2.38
1995 Stock Option Plan [Member]
Number of Shares
Outstanding at January 1, 2012	474,650
Granted
Exercised
Canceled	(184,750)
Outstanding at September 30, 2012	289,900
Shares exercisable at September 30, 2012	289,900
Weighted Average Exercise Price
Outstanding at January 1, 2012	$ 4.38
Granted
Exercised
Canceled	$ 4.01
Outstanding at September 30, 2012	$ 4.59
Options exercisable, September 30, 2012	$ 4.59