Stock Options (Details 2) (Stock options, USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Shares
Outstanding at the beginning of the period (in shares)	4,140,084	3,374,045
Granted (in shares)	576,249	915,536
Exercised (in shares)		(53,949)	(15,061)
Forfeited (in shares)	(1,157,075)	(95,548)
Outstanding at the end of the period (in shares)	3,559,258	4,140,084	3,374,045
Options exercisable at the end of the period (in shares)	2,463,646	2,548,936	2,303,152
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 5.83	$ 7.07
Granted (in dollars per share)	$ 2.58	$ 4.17
Exercised (in dollars per share)		$ 3.77
Forfeited (in dollars per share)	$ 5.91	$ 38.16
Outstanding at the end of the period (in dollars per share)	$ 5.28	$ 5.83	$ 7.07
Options exercisable at the end of the period (in dollars per share)	$ 6.00	$ 6.76	$ 8.32
Intrinsic value of options exercised	$ 6,000	$ 67,000
Minimum
Exercise Price Per Share
Outstanding at the beginning of the period (in dollars per share)	$ 3.04	$ 3.04
Granted (in dollars per share)	$ 0.52	$ 4.04
Exercised (in dollars per share)		$ 3.30
Forfeited (in dollars per share)	$ 3.04	$ 3.50
Outstanding at the end of the period (in dollars per share)	$ 0.52	$ 3.04
Options exercisable at the end of the period (in dollars per share)	$ 3.26	$ 3.04	$ 3.30
Maximum
Exercise Price Per Share
Outstanding at the beginning of the period (in dollars per share)	$ 263.55	$ 1,363.95
Granted (in dollars per share)	$ 3.54	$ 4.74
Exercised (in dollars per share)		$ 4.65
Forfeited (in dollars per share)	$ 140.70	$ 1,363.95
Outstanding at the end of the period (in dollars per share)	$ 263.55	$ 263.55
Options exercisable at the end of the period (in dollars per share)	$ 263.55	$ 263.55	$ 1,363.95