Share-Based Compensation - Exercise Prices (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding at end of year (in shares)	1,517,704	1,892,493
Outstanding, remaining contractual term (in years)	6 years
Outstanding at end of year	$ 6.05	$ 5.67
Options exercisable at end of year	1,172,400
Options exercisable (usd per share)	$ 6.58
$2.24—$4.48
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 2.24
Exercise price range, upper range limit	$ 4.48
Outstanding at end of year (in shares)	407,255
Outstanding, remaining contractual term (in years)	8 years 10 months 24 days
Outstanding at end of year	$ 4.14
Options exercisable at end of year	115,945
Options exercisable (usd per share)	$ 4.18
$4.48—$6.72
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 4.48
Exercise price range, upper range limit	$ 6.72
Outstanding at end of year (in shares)	355,820
Outstanding, remaining contractual term (in years)	4 years
Outstanding at end of year	$ 5.63
Options exercisable at end of year	301,826
Options exercisable (usd per share)	$ 5.73
$6.72—$8.96
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 6.72
Exercise price range, upper range limit	$ 8.96
Outstanding at end of year (in shares)	744,629
Outstanding, remaining contractual term (in years)	5 years 6 months
Outstanding at end of year	$ 7.25
Options exercisable at end of year	744,629
Options exercisable (usd per share)	$ 7.25
$8.96—$11.20
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 8.96
Exercise price range, upper range limit	$ 11.20
Outstanding at end of year (in shares)	10,000
Outstanding, remaining contractual term (in years)	1 year 1 month 6 days
Outstanding at end of year	$ 9.99
Options exercisable at end of year	10,000
Options exercisable (usd per share)	$ 9.99

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.

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

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

-Publisher FASB

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-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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-Publisher FASB

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Weighted average remaining contractual term for option awards outstanding, 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

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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

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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.

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