Stock-Based Compensation (Details 4) (USD $)	6 Months Ended
Jun. 30, 2013
Exercisable
Stock option awards outstanding at the beginning of the period (in shares)	3,895,442
Stock option awards forfeited (in shares)	(51,671)
Stock option awards exercised (in shares)	(68,791)
Stock option awards vested (in shares)	650,039
Stock option awards outstanding at the end of the period (in shares)	4,425,019
Weighted average exercise price
Stock option awards outstanding at the beginning of the period (in dollars per share)	$ 2.36
Stock option awards forfeited (in dollars per share)	$ 3.95
Stock option awards exercised (in dollars per share)	$ 2.61
Stock option awards vested (in dollars per share)	$ 3.88
Stock option awards outstanding at the end of the period (in dollars per share)	$ 2.55
Non-vested
Stock option awards outstanding at the beginning of the period (in shares)	2,984,477
Stock option awards granted (in shares)	566,305
Stock option awards forfeited (in shares)	(214,057)
Stock option awards vested (in shares)	(650,039)
Stock option awards outstanding at the end of the period (in shares)	2,686,686
Weighted average exercise price
Stock option awards outstanding at the beginning of the period (in dollars per share)	$ 4.55
Stock option awards granted (in dollars per share)	$ 7.09
Stock option awards forfeited (in dollars per share)	$ 4.90
Stock option awards vested (in dollars per share)	$ 3.88
Stock option awards outstanding at the end of the period (in dollars per share)	$ 5.21
Outstanding
Stock option awards outstanding at the beginning of the period (in shares)	6,879,919
Stock option awards granted (in shares)	566,305
Stock option awards forfeited (in shares)	(265,728)
Stock option awards exercised (in shares)	(68,791)
Stock option awards outstanding at the end of the period (in shares)	7,111,705
Weighted average exercise price
Stock option awards outstanding at the beginning of the period (in dollars per share)	$ 3.30
Stock option awards granted (in dollars per share)	$ 7.09
Stock option awards forfeited (in dollars per share)	$ 4.72
Stock option awards exercised (in dollars per share)	$ 2.61
Stock option awards outstanding at the end of the period (in dollars per share)	$ 3.56

Represents the number of share options forfeited during the period.

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Weighted average exercise price of non-vested options forfeited during the reporting period.

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Weighted average exercise price of non-vested options outstanding.

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Weighted average exercise price of options vested during the reporting period.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ 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)(iii)

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(3)

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Gross number of share options (or share units) granted during the period.

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Number of non-vested options outstanding.

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Number of non-vested options forfeited.

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Number of options outstanding, including both vested and non-vested options.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of options vested.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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