Stock-Based Compensation (Details) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Inducement grant options	Jun. 30, 2013 Inducement grant options	Mar. 31, 2013 Inducement grant options	Sep. 30, 2013 Plans Options	Jun. 30, 2013 Plans Options	Mar. 31, 2013 Plans Options	Sep. 30, 2013 Plans RSU's	Jun. 30, 2013 Plans RSU's
Stock-Based Compensation
Stock-based compensation expense	$ 1,000,000	$ 900,000	$ 2,800,000	$ 3,000,000
Unamortized compensation cost, net of expected forfeitures	6,100,000		6,100,000
Weighted average period for recognition of unamortized compensation cost			2 years 8 months 8 days
Tax benefits associated with the exercise of stock options	$ 0	$ 0	$ 0	$ 0
Available for Grant
Balance at the beginning of the period (in shares)								529,000	1,682,000	1,265,000
Additional shares authorized under the 2010 Plan										500,000
Options granted (in shares)								(228,000)	(1,140,000)	(176,000)
Restricted stock units granted (in shares)												(35,000)
Options cancelled (in shares)								469,000	113,000	471,000
Options expired (in shares)								(350,000)	(91,000)	(378,000)
Balance at the end of the period (in shares)								420,000	529,000	1,682,000
Number of Shares
Balance at the beginning of the period (in shares)					3,383,000	3,414,000	3,358,000	7,366,000	6,408,000	6,872,000
Options granted (in shares)					136,000		151,000	228,000	1,140,000	176,000
Options cancelled (in shares)							(1,000)	(469,000)	(113,000)	(471,000)
Options exercised (in shares)					(32,000)	(31,000)	(94,000)	(117,000)	(69,000)	(169,000)
Balance at the end of the period (in shares)					3,487,000	3,383,000	3,414,000	7,008,000	7,366,000	6,408,000
Weighted Average Exercise Prices
Balance at the beginning of the period (in dollars per share)					$ 4.39	$ 4.37	$ 4.29	$ 3.98	$ 3.97	$ 4.05
Options granted (in dollars per share)					$ 3.59		$ 4.21	$ 3.98	$ 4.46	$ 3.48
Options cancelled (in dollars per share)							$ 1.50	$ 6.15	$ 7.04	$ 5.48
Options exercised (in dollars per share)					$ 1.54	$ 1.54	$ 1.55	$ 2.66	$ 3.34	$ 2.80
Options expired (in dollars per share)								$ 6.80	$ 7.85	$ 5.78
Balance at the end of the period (in dollars per share)					$ 4.39	$ 4.39	$ 4.37	$ 3.88	$ 3.98	$ 3.97
Number of Shares
Non-vested shares at the beginning of the period											35,000
Restricted stock units granted (in shares)												35,000
Vested (in shares)											(8,000)
Non-vested shares at the end of the period											27,000	35,000
Weighted Average Grant-Date Fair Value
Non-vested shares at the beginning of the period (in dollars per share)											$ 4.46
Restrict stock units granted (in dollars per share)												$ 4.46
Vested (in dollars per share)											$ 4.46
Non-vested shares at the end of the period (in dollars per share)											$ 4.46	$ 4.46