Stock Option Plans (Details) (USD $)	12 Months Ended																															1 Months Ended		1 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Stock options	Dec. 31, 2011 Stock options	Dec. 31, 2010 Stock options	Dec. 31, 2012 Stock options Non-employee directors	Dec. 31, 2011 Stock options Non-employee directors	Dec. 31, 2010 Stock options Non-employee directors	Dec. 31, 2012 Stock options Officers and employees	Dec. 31, 2012 Stock options Employees	Dec. 31, 2011 Stock options Employees	Dec. 31, 2010 Stock options Employees	Dec. 31, 2012 Stock options Officers	Dec. 31, 2011 Stock options Officers	Dec. 31, 2010 Stock options Officers	Dec. 31, 2012 Restricted stock	Dec. 31, 2011 Restricted stock	Dec. 31, 2010 Restricted stock	Dec. 31, 2012 Time-Based	Dec. 31, 2011 Time-Based	Dec. 31, 2010 Time-Based	Dec. 31, 2012 Time-Based Non-employee directors	Dec. 31, 2011 Time-Based Non-employee directors	Dec. 31, 2010 Time-Based Non-employee directors	Dec. 31, 2012 Time-Based Officers	Dec. 31, 2011 Time-Based Officers	Dec. 31, 2010 Time-Based Officers	Dec. 31, 2012 Performance-Based	Dec. 31, 2011 Performance-Based	Dec. 31, 2012 2003 Plan	Dec. 31, 2012 2003 Plan Stock options Officers and employees	Dec. 31, 2012 2012 CEO Equity Incentive Plan	Dec. 31, 2012 2012 CEO Equity Incentive Plan Stock options Chief executive officer	Dec. 31, 2012 2012 CEO Equity Incentive Plan Time-Based
Share-Based Compensation
Shares authorized	3,500,000																														3,500,000		1,100,000
Shares available for grant	872,846																														872,846		550,000
Expiration term	10 years
Share-based compensation expense	$ 1,278,000	$ 1,618,000	$ 1,762,000	$ 594,000	$ 1,142,000	$ 1,281,000											$ 684,000	$ 476,000	$ 481,000	$ 684,000	$ 476,000	$ 481,000
Accelerated stock option compensation cost	787,000
Shares granted				767,500	247,500	391,500				217,500																						217,500		550,000
Weighted average fair value of options granted and the assumptions used in the Black-Scholes-Merton model
Weighted average fair value of options granted (in dollars per share)				$ 1.01	$ 3.32	$ 4.23
Dividend yield (as a percent)				0.00%	0.00%	0.00%
Weighted average risk-free interest (as a percent)				3.50%	4.00%	4.20%
Weighted average expected volatility (as a percent)				105.00%	94.00%	93.00%
Weighted average expected life							8 years 3 months	8 years 3 months	8 years		5 years 6 months	5 years 6 months	5 years 3 months	6 years	6 years	5 years 9 months
Options
Outstanding at the beginning of the period (in shares)				1,557,925	1,662,750	1,682,300
Shares granted				767,500	247,500	391,500				217,500																						217,500		550,000
Exercised (in shares)				(14,875)	(13,000)	(17,000)
Forfeited/canceled (in shares)				(285,175)	(339,325)	(394,050)
Outstanding at the end of the period (in shares)				2,025,375	1,557,925	1,662,750
Options exercisable at the end of the period (in shares)				1,113,670
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)				$ 9.70	$ 11.99	$ 14.48
Granted (in dollars per share)				$ 1.25	$ 4.23	$ 5.50
Exercised (in dollars per share)				$ 0.70	$ 0.70	$ 2.65
Forfeited/canceled (in dollars per share)				$ 10.93	$ 17.28	$ 16.59
Outstanding at the end of the period (in dollars per share)				$ 6.39	$ 9.70	$ 11.99
Options exercisable at the end of the period (in dollars per share)				$ 10.15
Weighted Average Remaining Term
Outstanding at the end of the period				6 years 4 months 24 days
Options exercisable at the end of the period				4 years 2 months 12 days
Additional disclosures
Fair value of options vested				1,456,000	1,344,000	1,145,000
Vested options expired (in shares)				231,676	261,575	281,550
Weighted average exercise price of vested options expired (in dollars per share)				$ 12.58	$ 17.53	$ 20.65
Shares awarded																				897,600			287,600	66,500	76,000	60,000	81,250	20,000							550,000
Vesting term																										4 years
Shares vested at the end of year three (as a percent)																										50.00%
Shares vested at the end of year four (as a percent)																										50.00%
Shares vested at the date of grant (as a percent)																							50.00%
Shares vested on the one-year anniversary of the date of grant (as a percent)																							50.00%
Fair value of the restricted stock which is amortized at the date of grant (as a percent)																							50.00%
Fair value of the restricted stock which is amortized ratably over the one year vesting period (as a percent)																							50.00%
Restricted Stock
Outstanding, beginning of period (in shares)																				141,000									625	625
Granted (in shares)																				897,600			287,600	66,500	76,000	60,000	81,250	20,000							550,000
Vested (in shares)																				(243,800)
Forfeited/cancelled (in shares)																				(585,850)
Outstanding, end of period (in shares)																				208,950	141,000								625	625
Weighted Average Grant-date Fair Value
Outstanding, beginning of period (in dollars per share)																				$ 5.12									$ 31.10	$ 31.10
Granted (in dollars per share)																				$ 0.96
Vested (in dollars per share)																				$ 2.92
Forfeited/cancelled (in dollars per share)																				$ 0.46
Outstanding, end of period (in dollars per share)																				$ 2.87	$ 5.12								$ 31.10	$ 31.10
Unrecognized compensation cost:
Unrecognized compensation cost	$ 1,149,000			$ 852,000																$ 297,000
Weighted average recognition period				28 years 10 months 24 days																13 years 2 months 12 days