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Stock Incentive Plan - Stock Options Outstanding (Details) (USD $)
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12 Months Ended |
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Dec. 31, 2012
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Outstanding Options - Number Outstanding (in shares) |
4,778,143
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| Exercisable Options - Number Exercisable (in shares) |
3,309,722
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2000 Plan | Exercise Price $1.750
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Options Outstanding - Exercise Price |
$ 1.750
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| Outstanding Options - Number Outstanding (in shares) |
84,511
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| Outstanding Options - Weighted-Average Remaining Term |
6 months 11 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 1.750
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| Exercisable Options - Number Exercisable (in shares) |
84,511
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| Exercisable Options - Weighted-Average Exercise Price |
$ 1.750
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2000 Plan | Exercise Price $1.875
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Options Outstanding - Exercise Price |
$ 1.875
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| Outstanding Options - Number Outstanding (in shares) |
112,500
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| Outstanding Options - Weighted-Average Remaining Term |
8 months 23 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 1.875
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| Exercisable Options - Number Exercisable (in shares) |
112,500
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| Exercisable Options - Weighted-Average Exercise Price |
$ 1.875
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2000 Plan | Exercise Price $2.750
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Options Outstanding - Exercise Price |
$ 2.750
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| Outstanding Options - Number Outstanding (in shares) |
453,231
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| Outstanding Options - Weighted-Average Remaining Term |
1 year 6 months 4 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 2.750
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| Exercisable Options - Number Exercisable (in shares) |
453,231
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| Exercisable Options - Weighted-Average Exercise Price |
$ 2.750
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2000 Plan | Exercise Price $3.000
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Options Outstanding - Exercise Price |
$ 3.000
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| Outstanding Options - Number Outstanding (in shares) |
41,600
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| Outstanding Options - Weighted-Average Remaining Term |
2 years 26 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 3.000
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| Exercisable Options - Number Exercisable (in shares) |
41,600
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| Exercisable Options - Weighted-Average Exercise Price |
$ 3.000
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2000 Plan | Exercise Price $3.250
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Options Outstanding - Exercise Price |
$ 3.250
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| Outstanding Options - Number Outstanding (in shares) |
603,904
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| Outstanding Options - Weighted-Average Remaining Term |
3 years 2 months 9 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 3.250
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| Exercisable Options - Number Exercisable (in shares) |
603,904
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| Exercisable Options - Weighted-Average Exercise Price |
$ 3.250
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2000 Plan | Exercise Price $3.410
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Options Outstanding - Exercise Price |
$ 3.410
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| Outstanding Options - Number Outstanding (in shares) |
569,862
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| Outstanding Options - Weighted-Average Remaining Term |
4 years 7 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 3.410
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| Exercisable Options - Number Exercisable (in shares) |
569,862
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| Exercisable Options - Weighted-Average Exercise Price |
$ 3.410
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2000 Plan | Exercise Price $4.220
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Options Outstanding - Exercise Price |
$ 4.220
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| Outstanding Options - Number Outstanding (in shares) |
383,109
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| Outstanding Options - Weighted-Average Remaining Term |
4 years 7 months 24 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 4.220
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| Exercisable Options - Number Exercisable (in shares) |
379,859
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| Exercisable Options - Weighted-Average Exercise Price |
$ 4.220
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2000 Plan | Exercise Price $6.055
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Options Outstanding - Exercise Price |
$ 6.055
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| Outstanding Options - Number Outstanding (in shares) |
976,000
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| Outstanding Options - Weighted-Average Remaining Term |
6 years 5 months 27 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 6.055
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| Exercisable Options - Number Exercisable (in shares) |
654,300
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| Exercisable Options - Weighted-Average Exercise Price |
$ 6.055
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2000 Plan | Exercise Price $13.045
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Options Outstanding - Exercise Price |
$ 13.045
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| Outstanding Options - Number Outstanding (in shares) |
593,000
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| Outstanding Options - Weighted-Average Remaining Term |
7 years 3 months 26 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 13.045
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| Exercisable Options - Number Exercisable (in shares) |
337,500
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| Exercisable Options - Weighted-Average Exercise Price |
$ 13.045
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2000 Plan | Exercise Price $16.290
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Options Outstanding - Exercise Price |
$ 16.290
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| Outstanding Options - Number Outstanding (in shares) |
28,688
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| Outstanding Options - Weighted-Average Remaining Term |
8 years 26 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 16.290
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| Exercisable Options - Number Exercisable (in shares) |
10,041
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| Exercisable Options - Weighted-Average Exercise Price |
$ 16.290
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2010 Plan | Exercise Price $10.750
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Options Outstanding - Exercise Price |
$ 10.750
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| Outstanding Options - Number Outstanding (in shares) |
76,995
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| Outstanding Options - Weighted-Average Remaining Term |
9 years 4 months 28 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 10.750
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| Exercisable Options - Number Exercisable (in shares) |
5,399
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| Exercisable Options - Weighted-Average Exercise Price |
$ 10.750
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2010 Plan | Exercise Price $10.950
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Options Outstanding - Exercise Price |
$ 10.950
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| Outstanding Options - Number Outstanding (in shares) |
140,000
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| Outstanding Options - Weighted-Average Remaining Term |
8 years 8 months 16 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 10.950
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| Exercisable Options - Number Exercisable (in shares) |
36,000
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| Exercisable Options - Weighted-Average Exercise Price |
$ 10.950
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2010 Plan | Exercise Price $11.630
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Options Outstanding - Exercise Price |
$ 11.630
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| Outstanding Options - Number Outstanding (in shares) |
155,093
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| Outstanding Options - Weighted-Average Remaining Term |
9 years 5 months 16 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 11.630
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| Exercisable Options - Number Exercisable (in shares) |
5,015
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| Exercisable Options - Weighted-Average Exercise Price |
$ 11.630
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2010 Plan | Exercise Price $11.980
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Options Outstanding - Exercise Price |
$ 11.980
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| Outstanding Options - Number Outstanding (in shares) |
499,650
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| Outstanding Options - Weighted-Average Remaining Term |
9 years 3 months 26 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 11.980
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| Exercisable Options - Number Exercisable (in shares) |
4,000
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| Exercisable Options - Weighted-Average Exercise Price |
$ 11.980
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2010 Plan | Exercise Price $14.810
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Options Outstanding - Exercise Price |
$ 14.810
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| Outstanding Options - Number Outstanding (in shares) |
60,000
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| Outstanding Options - Weighted-Average Remaining Term |
8 years 4 months 24 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 14.810
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| Exercisable Options - Number Exercisable (in shares) |
12,000
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| Exercisable Options - Weighted-Average Exercise Price |
$ 14.810
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