Share-based Compensation (Details 5) (USD $)	12 Months Ended
Dec. 31, 2014
Options Outstanding
Number Outstanding (in shares)	3,344,882
Options Exercisable
Number Exercisable (in shares)	1,833,719
$0.25 - $3.50
Share-based Compensation
Exercise price, low end of range (in dollars per share)	$ 0.25
Exercise price, high end of range (in dollars per share)	$ 3.5
Options Outstanding
Number Outstanding (in shares)	1,707,528
Weighted Average Remaining Contractual life (in years)	8 years 3 months 18 days
Weighted Average Exercise Price (in dollars per share)	$ 1.47
Options Exercisable
Number Exercisable (in shares)	454,541
Weighted Average Exercise Price (in dollars per share)	$ 2.74
$3.51 - $7.00
Share-based Compensation
Exercise price, low end of range (in dollars per share)	$ 3.51
Exercise price, high end of range (in dollars per share)	$ 7
Options Outstanding
Number Outstanding (in shares)	353,806
Weighted Average Remaining Contractual life (in years)	7 years 2 months 12 days
Weighted Average Exercise Price (in dollars per share)	$ 3.97
Options Exercisable
Number Exercisable (in shares)	176,448
Weighted Average Exercise Price (in dollars per share)	$ 4.12
$7.01 - $8.00
Share-based Compensation
Exercise price, low end of range (in dollars per share)	$ 7.01
Exercise price, high end of range (in dollars per share)	$ 8
Options Outstanding
Number Outstanding (in shares)	482,654
Weighted Average Remaining Contractual life (in years)	3 years 4 months 24 days
Weighted Average Exercise Price (in dollars per share)	$ 7.69
Options Exercisable
Number Exercisable (in shares)	482,654
Weighted Average Exercise Price (in dollars per share)	$ 7.69
$8.01 - $12.00
Share-based Compensation
Exercise price, low end of range (in dollars per share)	$ 8.01
Exercise price, high end of range (in dollars per share)	$ 12
Options Outstanding
Number Outstanding (in shares)	483,055
Weighted Average Remaining Contractual life (in years)	5 years 8 months 12 days
Weighted Average Exercise Price (in dollars per share)	$ 9.13
Options Exercisable
Number Exercisable (in shares)	402,237
Weighted Average Exercise Price (in dollars per share)	$ 9.19
$12.01 - $18.00
Share-based Compensation
Exercise price, low end of range (in dollars per share)	$ 12.01
Exercise price, high end of range (in dollars per share)	$ 18
Options Outstanding
Number Outstanding (in shares)	81,306
Weighted Average Remaining Contractual life (in years)	2 years 10 months 24 days
Weighted Average Exercise Price (in dollars per share)	$ 13.19
Options Exercisable
Number Exercisable (in shares)	81,306
Weighted Average Exercise Price (in dollars per share)	$ 13.19
$18.01 - $20.00
Share-based Compensation
Exercise price, low end of range (in dollars per share)	$ 18.01
Exercise price, high end of range (in dollars per share)	$ 20
Options Outstanding
Number Outstanding (in shares)	236,533
Weighted Average Remaining Contractual life (in years)	5 years 7 months 6 days
Weighted Average Exercise Price (in dollars per share)	$ 18.36
Options Exercisable
Number Exercisable (in shares)	236,533
Weighted Average Exercise Price (in dollars per share)	$ 18.36
$20.01 - $25.00
Share-based Compensation
Exercise price, low end of range (in dollars per share)	$ 20.01
Exercise price, high end of range (in dollars per share)	$ 25

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 Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)

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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 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 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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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)

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

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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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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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

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

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