Stockholders' Equity and Stock-Based Compensation (Details 1) (USD $)	12 Months Ended
Dec. 31, 2012
Summary of stock options outstanding
Outstanding	7,928,350
Weighted Average Exercise Price of Outstanding Options	$ 7.19
Weighted Average Remaining Contract Life	6 years 10 months 24 days
Vested	4,591,238
Weighted Average Exercise Price of Vested Options	$ 7.98
$2.80 - $4.58 [Member]
Summary of stock options outstanding
Option price per share, minimum	$ 2.80
Option price per share, maximum	$ 4.58
Outstanding	1,400,175
Weighted Average Exercise Price of Outstanding Options	$ 3.36
Weighted Average Remaining Contract Life	6 years 1 month 6 days
Vested	1,258,425
Weighted Average Exercise Price of Vested Options	$ 3.36
$4.90 - $7.45 [Member]
Summary of stock options outstanding
Option price per share, minimum	$ 4.90
Option price per share, maximum	$ 7.45
Outstanding	4,783,225
Weighted Average Exercise Price of Outstanding Options	$ 6.30
Weighted Average Remaining Contract Life	8 years 1 month 6 days
Vested	1,606,613
Weighted Average Exercise Price of Vested Options	$ 6.31
$7.76 - $13.29 [Member]
Summary of stock options outstanding
Option price per share, minimum	$ 7.76
Option price per share, maximum	$ 13.29
Outstanding	824,500
Weighted Average Exercise Price of Outstanding Options	$ 9.96
Weighted Average Remaining Contract Life	3 years 7 months 6 days
Vested	805,750
Weighted Average Exercise Price of Vested Options	$ 9.96
$14.03 - $16.39 [Member]
Summary of stock options outstanding
Option price per share, minimum	$ 14.03
Option price per share, maximum	$ 16.39
Outstanding	920,450
Weighted Average Exercise Price of Outstanding Options	$ 15.22
Weighted Average Remaining Contract Life	5 years
Vested	920,450
Weighted Average Exercise Price of Vested Options	$ 15.22

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

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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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)

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- Definition

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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- Definition

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 Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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

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-Name Statement of Financial Accounting Standard (FAS)

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-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.

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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.

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- Definition

Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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