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Stock Incentive Plan - Stock Options Outstanding (Details) (USD $)
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9 Months Ended |
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Sep. 30, 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) |
4,942,961
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| Exercisable Options - Number Exercisable (in shares) |
3,292,991
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2000 Plan [Member] | Exercise Price $1.500
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Stock Options Outstanding Exercise Price |
$ 1.500
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| Outstanding Options - Number Outstanding (in shares) |
20,000
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
3 months 29 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 1.500
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| Exercisable Options - Number Exercisable (in shares) |
20,000
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| Exercisable Options - Weighted-Average Exercise Price |
$ 1.500
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2000 Plan [Member] | 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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| Stock Options Outstanding Exercise Price |
$ 1.750
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| Outstanding Options - Number Outstanding (in shares) |
110,999
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
9 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) |
110,999
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| Exercisable Options - Weighted-Average Exercise Price |
$ 1.750
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2000 Plan [Member] | 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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| Stock 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 Contractual Life |
11 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 [Member] | 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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| Stock Options Outstanding Exercise Price |
$ 2.750
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| Outstanding Options - Number Outstanding (in shares) |
454,231
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
1 year 9 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) |
448,231
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| Exercisable Options - Weighted-Average Exercise Price |
$ 2.750
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2000 Plan [Member] | 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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| Stock Options Outstanding Exercise Price |
$ 3
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| Outstanding Options - Number Outstanding (in shares) |
41,600
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
2 years 3 months 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 [Member] | 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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| Stock 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 Contractual Life |
3 years 5 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 [Member] | 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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| Stock Options Outstanding Exercise Price |
$ 3.410
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| Outstanding Options - Number Outstanding (in shares) |
676,692
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
4 years 3 months 7 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 3.410
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| Exercisable Options - Number Exercisable (in shares) |
676,692
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| Exercisable Options - Weighted-Average Exercise Price |
$ 3.410
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2000 Plan [Member] | 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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| Stock 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 Contractual Life |
4 years 10 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) |
356,609
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| Exercisable Options - Weighted-Average Exercise Price |
$ 4.220
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2000 Plan [Member] | 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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| Stock Options Outstanding Exercise Price |
$ 6.055
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| Outstanding Options - Number Outstanding (in shares) |
976,500
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
6 years 8 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) |
602,500
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| Exercisable Options - Weighted-Average Exercise Price |
$ 6.055
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2000 Plan [Member] | 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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| Stock Options Outstanding Exercise Price |
$ 13.045
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| Outstanding Options - Number Outstanding (in shares) |
603,000
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
7 years 6 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) |
271,350
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| Exercisable Options - Weighted-Average Exercise Price |
$ 13.045
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2010 Plan [Member] | 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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| Stock Options Outstanding Exercise Price |
$ 10.75
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| Outstanding Options - Number Outstanding (in shares) |
76,995
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
9 years 8 months 1 day
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| Outstanding Options - Weighted-Average Exercise Price |
$ 10.750
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| Exercisable Options - Number Exercisable (in shares) |
0
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| Exercisable Options - Weighted-Average Exercise Price |
$ 10.750
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2010 Plan [Member] | 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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| Stock 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 Contractual Life |
8 years 11 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) |
28,000
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| Exercisable Options - Weighted-Average Exercise Price |
$ 10.950
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2010 Plan [Member] | 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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| Stock 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 Contractual Life |
9 years 8 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) |
0
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| Exercisable Options - Weighted-Average Exercise Price |
$ 11.630
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2010 Plan [Member] | 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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| Stock Options Outstanding Exercise Price |
$ 11.98
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| Outstanding Options - Number Outstanding (in shares) |
499,650
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
9 years 6 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) |
0
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| Exercisable Options - Weighted-Average Exercise Price |
$ 11.980
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2010 Plan [Member] | 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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| Stock 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 Contractual Life |
8 years 7 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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2010 Plan [Member] | 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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| Stock 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 Contractual Life |
8 years 3 months 26 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 16.290
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| Exercisable Options - Number Exercisable (in shares) |
8,606
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| Exercisable Options - Weighted-Average Exercise Price |
$ 16.290
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