Stock Options (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2012
Stock options outstanding
Exercise price, low end of range (in dollars per share)	$ 3.04
Exercise price, high end of range (in dollars per share)	$ 263.55
Options Outstanding
Number Outstanding (in shares)	3,559,258
Weighted Average Remaining Contractual Life	6 years 3 months 18 days
Weighted Average Exercise Price (in dollars per share)	$ 5.28
Options Exercisable
Number Exercisable (in shares)	2,463,646
Weighted Average Exercise Price (in dollars per share)	$ 6.00
$.52 - $1.00
Stock options outstanding
Exercise price, low end of range (in dollars per share)	$ 0.52
Exercise price, high end of range (in dollars per share)	$ 1.00
Options Outstanding
Number Outstanding (in shares)	150,000
Weighted Average Remaining Contractual Life	9 years 9 months 18 days
Weighted Average Exercise Price (in dollars per share)	$ 0.60
Options Exercisable
Weighted Average Exercise Price (in dollars per share)	$ 0.00
$1.01 - $4.00
Stock options outstanding
Exercise price, low end of range (in dollars per share)	$ 1.01
Exercise price, high end of range (in dollars per share)	$ 4.00
Options Outstanding
Number Outstanding (in shares)	784,266
Weighted Average Remaining Contractual Life	6 years 6 months
Weighted Average Exercise Price (in dollars per share)	$ 3.37
Options Exercisable
Number Exercisable (in shares)	598,413
Weighted Average Exercise Price (in dollars per share)	$ 3.39
$4.01 - $6.00
Stock options outstanding
Exercise price, low end of range (in dollars per share)	$ 4.01
Exercise price, high end of range (in dollars per share)	$ 6.00
Options Outstanding
Number Outstanding (in shares)	1,650,066
Weighted Average Remaining Contractual Life	7 years 2 months 12 days
Weighted Average Exercise Price (in dollars per share)	$ 4.38
Options Exercisable
Number Exercisable (in shares)	890,307
Weighted Average Exercise Price (in dollars per share)	$ 4.39
$6.01 - $7.00
Stock options outstanding
Exercise price, low end of range (in dollars per share)	$ 6.01
Exercise price, high end of range (in dollars per share)	$ 7.00
Options Outstanding
Number Outstanding (in shares)	85,714
Weighted Average Remaining Contractual Life	3 years 6 months
Weighted Average Exercise Price (in dollars per share)	$ 6.79
Options Exercisable
Number Exercisable (in shares)	85,714
Weighted Average Exercise Price (in dollars per share)	$ 6.79
$7.01 - $8.00
Stock options outstanding
Exercise price, low end of range (in dollars per share)	$ 7.01
Exercise price, high end of range (in dollars per share)	$ 8.00
Options Outstanding
Number Outstanding (in shares)	507,132
Weighted Average Remaining Contractual Life	3 years 10 months 24 days
Weighted Average Exercise Price (in dollars per share)	$ 7.28
Options Exercisable
Number Exercisable (in shares)	507,132
Weighted Average Exercise Price (in dollars per share)	$ 7.28
$8.01 - $12.00
Stock options outstanding
Exercise price, low end of range (in dollars per share)	$ 8.01
Exercise price, high end of range (in dollars per share)	$ 12.00
Options Outstanding
Number Outstanding (in shares)	379,210
Weighted Average Remaining Contractual Life	4 years 1 month 6 days
Weighted Average Exercise Price (in dollars per share)	$ 10.69
Options Exercisable
Number Exercisable (in shares)	379,210
Weighted Average Exercise Price (in dollars per share)	$ 10.69
$12.01 - $263.55
Stock options outstanding
Exercise price, low end of range (in dollars per share)	$ 12.01
Exercise price, high end of range (in dollars per share)	$ 263.55
Options Outstanding
Number Outstanding (in shares)	2,870
Weighted Average Remaining Contractual Life	1 year
Weighted Average Exercise Price (in dollars per share)	$ 179.25
Options Exercisable
Number Exercisable (in shares)	2,870
Weighted Average Exercise Price (in dollars per share)	$ 179.25