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Options Outstanding and Exercisable (Detail) (USD $)
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6 Months Ended |
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Jun. 30, 2012
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Dec. 31, 2011
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Jul. 01, 2010
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Outstanding Number of Stock Options |
7,809,270 |
7,542,459 |
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| Outstanding Weighted Average Remaining Life (Years) |
5 years 9 months 22 days |
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| Outstanding Weighted Average Exercise Price |
$ 0.39 |
$ 0.41 |
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| Exercisable Number of Stock Options |
6,177,948 |
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| Exercisable Weighted Average Exercise Price |
$ 0.44 |
|
$ 0.27 |
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Range 1
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Price range, lower limit |
$ 0.07 |
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| Price range, upper limit |
$ 0.20 |
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| Outstanding Number of Stock Options |
2,038,760 |
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| Outstanding Weighted Average Remaining Life (Years) |
7 years 9 months 18 days |
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| Outstanding Weighted Average Exercise Price |
$ 0.12 |
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| Exercisable Number of Stock Options |
1,279,659 |
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| Exercisable Weighted Average Exercise Price |
$ 0.11 |
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Range 2
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Price range, lower limit |
$ 0.21 |
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| Price range, upper limit |
$ 0.30 |
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| Outstanding Number of Stock Options |
2,180,032 |
|
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| Outstanding Weighted Average Remaining Life (Years) |
8 years 1 month 6 days |
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| Outstanding Weighted Average Exercise Price |
$ 0.28 |
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| Exercisable Number of Stock Options |
1,380,036 |
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| Exercisable Weighted Average Exercise Price |
$ 0.28 |
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Range 3
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Price range, lower limit |
$ 0.31 |
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| Price range, upper limit |
$ 0.50 |
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| Outstanding Number of Stock Options |
1,794,070 |
|
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| Outstanding Weighted Average Remaining Life (Years) |
4 years 6 months |
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| Outstanding Weighted Average Exercise Price |
$ 0.41 |
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| Exercisable Number of Stock Options |
1,721,845 |
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| Exercisable Weighted Average Exercise Price |
$ 0.41 |
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Range 4
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Price range, lower limit |
$ 0.51 |
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| Price range, upper limit |
$ 1.00 |
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| Outstanding Number of Stock Options |
1,763,408 |
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| Outstanding Weighted Average Remaining Life (Years) |
2 years 1 month 6 days |
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| Outstanding Weighted Average Exercise Price |
$ 0.81 |
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| Exercisable Number of Stock Options |
1,763,408 |
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| Exercisable Weighted Average Exercise Price |
$ 0.81 |
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Range 5
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
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| Price range, lower limit |
$ 1.01 |
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| Price range, upper limit |
$ 1.33 |
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| Outstanding Number of Stock Options |
33,000 |
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| Outstanding Weighted Average Remaining Life (Years) |
1 year 6 months |
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| Outstanding Weighted Average Exercise Price |
$ 1.13 |
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| Exercisable Number of Stock Options |
33,000 |
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| Exercisable Weighted Average Exercise Price |
$ 1.13 |
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