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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, 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) |
5,242,944
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| Exercisable Options - Number Exercisable (in shares) |
3,559,121
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2000 Plan [Member] | Exercise Price $0.875
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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 |
$ 0.875
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| Outstanding Options - Number Outstanding (in shares) |
14,000
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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 |
$ 0.875
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| Exercisable Options - Number Exercisable (in shares) |
14,000
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| Exercisable Options - Weighted-Average Exercise Price |
$ 0.875
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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 |
6 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) |
167,499
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
1 year 0 months 15 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 1.750
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| Exercisable Options - Number Exercisable (in shares) |
167,499
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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 |
1 year 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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| Stock Options Outstanding Exercise Price |
$ 2.750
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| Outstanding Options - Number Outstanding (in shares) |
552,231
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
2 years 0 months 7 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 2.750
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| Exercisable Options - Number Exercisable (in shares) |
546,231
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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 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) |
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) |
626,204
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
3 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) |
626,204
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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) |
844,912
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
4 years 6 months 11 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 3.410
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| Exercisable Options - Number Exercisable (in shares) |
844,912
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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) |
428,403
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
5 years 2 months 1 day
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| Outstanding Options - Weighted-Average Exercise Price |
$ 4.220
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| Exercisable Options - Number Exercisable (in shares) |
355,453
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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) |
995,450
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
6 years 11 months 19 days
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| Outstanding Options - Weighted-Average Exercise Price |
$ 6.055
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| Exercisable Options - Number Exercisable (in shares) |
569,150
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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) |
606,000
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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 |
$ 13.045
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| Exercisable Options - Number Exercisable (in shares) |
242,400
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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 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) |
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 |
9 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) |
0
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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) |
28,812
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| Outstanding Options - Weighted-Average Remaining Contractual Life |
9 years 5 months 1 day
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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 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) |
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 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) |
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 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) |
7,172
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| Exercisable Options - Weighted-Average Exercise Price |
$ 16.290
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