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Stock Incentive Plan - Stock Options Outstanding (Details) (USD $)
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3 Months Ended |
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Mar. 31, 2013
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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) |
4,492,237
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| Exercisable Options - Number Exercisable (in shares) |
3,117,595
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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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| Outstanding Options - 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 Contractual Life |
3 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 [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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| Outstanding Options - 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 |
5 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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| Outstanding Options - Exercise Price |
$ 2.750
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| Outstanding Options - Number Outstanding (in shares) |
403,231
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
1 year 3 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) |
403,231
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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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| Outstanding Options - Exercise Price |
$ 3.000
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| Outstanding Options - Number Outstanding (in shares) |
21,600
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
1 year 9 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) |
21,600
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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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| Outstanding Options - Exercise Price |
$ 3.250
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| Outstanding Options - Number Outstanding (in shares) |
602,304
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
2 years 11 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) |
602,304
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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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| Outstanding Options - Exercise Price |
$ 3.410
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| Outstanding Options - Number Outstanding (in shares) |
456,562
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
3 years 9 months 18 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 3.410
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| Exercisable Options - Number Exercisable (in shares) |
456,562
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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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| Outstanding Options - Exercise Price |
$ 4.220
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| Outstanding Options - Number Outstanding (in shares) |
320,053
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
4 years 4 months 28 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 4.220
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| Exercisable Options - Number Exercisable (in shares) |
320,053
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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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| Outstanding Options - Exercise Price |
$ 6.055
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| Outstanding Options - Number Outstanding (in shares) |
974,800
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
6 years 3 months
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| Outstanding Options - Weighted-Average Exercise Price |
$ 6.055
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| Exercisable Options - Number Exercisable (in shares) |
676,300
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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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| Outstanding Options - Exercise Price |
$ 13.045
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| Outstanding Options - Number Outstanding (in shares) |
586,250
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
7 years 26 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 13.045
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| Exercisable Options - Number Exercisable (in shares) |
366,650
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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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| Outstanding Options - 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 Contractual Life |
9 years 2 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) |
5,399
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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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| Outstanding Options - 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 5 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 [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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| Outstanding Options - 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 2 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 [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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| Outstanding Options - Exercise Price |
$ 11.980
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| Outstanding Options - Number Outstanding (in shares) |
469,650
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
9 years 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 [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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| Outstanding Options - 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 1 month 28 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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| Outstanding Options - 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 |
7 years 9 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) |
11,470
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| Exercisable Options - Weighted-Average Exercise Price |
$ 16.290
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