Stock Option and Purchase Plans (Details 2) (USD $)	12 Months Ended
Dec. 31, 2012 Y
Range of Exercise Prices $3.13 - $6.05
Summary of Stock Options
Exercise price, low end of the range (in dollars per share)	$ 3.13
Exercise price, high end of the range (in dollars per share)	$ 6.05
Options Outstanding
Number Outstanding at end of the period (in shares)	3,095,998
Weighted-Average Remaining Contractual Life (in years)	5.0
Weighted-Average Exercise Price (in dollars per share)	$ 4.67
Options Exercisable
Number Exercisable at the end of the period (in shares)	3,060,143
Weighted Average Exercise Price (in dollars per share)	$ 4.67
Range of Exercise Prices $6.10 - $12.04
Summary of Stock Options
Exercise price, low end of the range (in dollars per share)	$ 6.10
Exercise price, high end of the range (in dollars per share)	$ 12.04
Options Outstanding
Number Outstanding at end of the period (in shares)	3,945,660
Weighted-Average Remaining Contractual Life (in years)	8.0
Weighted-Average Exercise Price (in dollars per share)	$ 9.99
Options Exercisable
Number Exercisable at the end of the period (in shares)	1,698,417
Weighted Average Exercise Price (in dollars per share)	$ 9.08
Range of Exercise Prices $18.71 - $25.74
Summary of Stock Options
Exercise price, low end of the range (in dollars per share)	$ 18.71
Exercise price, high end of the range (in dollars per share)	$ 25.74
Options Outstanding
Number Outstanding at end of the period (in shares)	1,469,259
Weighted-Average Remaining Contractual Life (in years)	9.4
Weighted-Average Exercise Price (in dollars per share)	$ 23.16
Options Exercisable
Number Exercisable at the end of the period (in shares)	22,741
Weighted Average Exercise Price (in dollars per share)	$ 22.63
Range of Exercise Prices $3.13 - $25.74
Summary of Stock Options
Exercise price, low end of the range (in dollars per share)	$ 3.13
Exercise price, high end of the range (in dollars per share)	$ 25.74
Options Outstanding
Number Outstanding at end of the period (in shares)	8,510,917
Weighted-Average Remaining Contractual Life (in years)	7.2
Weighted-Average Exercise Price (in dollars per share)	$ 10.33
Options Exercisable
Number Exercisable at the end of the period (in shares)	4,781,301
Weighted Average Exercise Price (in dollars per share)	$ 6.32

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(c)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(a, b)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

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- Definition

The weighted-average period remaining as of the balance sheet date until option expiration pertaining to the outstanding stock options for all option plans in the customized range of exercise prices, which may be expressed in a variety of ways (for example, years, months).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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