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Stock Incentive Plan - Stock Options Outstanding (Details) (USD $)
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6 Months Ended |
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Jun. 30, 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) |
4,434,041
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| Exercisable Options - Number Exercisable (in shares) |
3,190,465
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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) |
64,511
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
15 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 1.750
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| Exercisable Options - Number Exercisable (in shares) |
64,511
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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 |
2 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) |
391,731
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
1 year
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| Outstanding Options - Weighted-Average Exercise Price |
$ 2.750
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| Exercisable Options - Number Exercisable (in shares) |
391,731
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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) |
13,600
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
1 year 6 months 29 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 3.000
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| Exercisable Options - Number Exercisable (in shares) |
13,600
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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) |
586,144
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
2 years 8 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) |
586,144
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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) |
446,562
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
3 years 6 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) |
446,562
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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) |
270,053
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
4 years 1 month 28 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 4.220
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| Exercisable Options - Number Exercisable (in shares) |
270,053
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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) |
973,750
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
6 years
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| Outstanding Options - Weighted-Average Exercise Price |
$ 6.055
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| Exercisable Options - Number Exercisable (in shares) |
727,250
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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) |
578,000
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
6 years 9 months 29 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 13.045
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| Exercisable Options - Number Exercisable (in shares) |
392,300
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| Exercisable Options - Weighted-Average Exercise Price |
$ 13.045
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2010 Plan [Member] | Exercise Price $7.150
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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 |
$ 7.150
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| Outstanding Options - Number Outstanding (in shares) |
30,000
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
9 years 9 months 22 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 7.150
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| Exercisable Options - Number Exercisable (in shares) |
0
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| Exercisable Options - Weighted-Average Exercise Price |
$ 7.150
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2010 Plan [Member] | Exercise Price $8.390
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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 |
$ 8.390
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| Outstanding Options - Number Outstanding (in shares) |
50,000
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
9 years 11 months 1 day
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| Outstanding Options - Weighted-Average Exercise Price |
$ 8.390
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| Exercisable Options - Number Exercisable (in shares) |
0
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| Exercisable Options - Weighted-Average Exercise Price |
$ 8.390
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2010 Plan [Member] | Exercise Price $8.860
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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 |
$ 8.860
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| Outstanding Options - Number Outstanding (in shares) |
24,360
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
9 years 11 months 12 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 8.860
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| Exercisable Options - Number Exercisable (in shares) |
0
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| Exercisable Options - Weighted-Average Exercise Price |
$ 8.860
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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) |
55,399
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
8 years 11 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) |
15,399
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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 2 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 |
8 years 11 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) |
453,650
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
8 years 9 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) |
93,930
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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 |
7 years 10 months 28 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 14.810
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| Exercisable Options - Number Exercisable (in shares) |
24,000
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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 6 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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