Stock-Based Compensation (Schedule of Exercise Prices) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012
Under $1.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, upper range limit	$ 1.00
Number of outstanding options	58
Outstanding options, weighted average outstanding contractual term	2 years 3 months 18 days
Outstanding options, weighted average exercise price	$ 0.93
Number of exercisable options	58
Exercisable options, weighted average exercise price	$ 0.93
$1.00 - $2.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 1.00
Exercise price range, upper range limit	$ 2.00
Number of outstanding options	104
Outstanding options, weighted average outstanding contractual term	9 years 8 months 12 days
Outstanding options, weighted average exercise price	$ 1.48
Number of exercisable options	2
Exercisable options, weighted average exercise price	$ 1.53
$2.01 - $3.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 2.01
Exercise price range, upper range limit	$ 3.00
Number of outstanding options	50
Outstanding options, weighted average outstanding contractual term	8 years 7 months 6 days
Outstanding options, weighted average exercise price	$ 2.19
Number of exercisable options	21
Exercisable options, weighted average exercise price	$ 2.19
$3.01 -$4.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 3.01
Exercise price range, upper range limit	$ 4.00
Number of outstanding options	1
Outstanding options, weighted average outstanding contractual term	8 years 7 months 6 days
Outstanding options, weighted average exercise price	$ 3.72
Number of exercisable options	0
Exercisable options, weighted average exercise price	$ 3.72
$4.01 - $5.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 4.01
Exercise price range, upper range limit	$ 5.00
Number of outstanding options	116
Outstanding options, weighted average outstanding contractual term	7 years 9 months 18 days
Outstanding options, weighted average exercise price	$ 4.31
Number of exercisable options	59
Exercisable options, weighted average exercise price	$ 4.31
$5.01 - $6.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 5.01
Exercise price range, upper range limit	$ 6.00
Number of outstanding options	162
Outstanding options, weighted average outstanding contractual term	5 years
Outstanding options, weighted average exercise price	$ 5.54
Number of exercisable options	156
Exercisable options, weighted average exercise price	$ 5.55
$6.01 - $7.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 6.01
Exercise price range, upper range limit	$ 7.00
Number of outstanding options	119
Outstanding options, weighted average outstanding contractual term	7 years 2 months 12 days
Outstanding options, weighted average exercise price	$ 6.13
Number of exercisable options	49
Exercisable options, weighted average exercise price	$ 6.15
Greater than $7.01
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 7.01
Number of outstanding options	182
Outstanding options, weighted average outstanding contractual term	5 years 2 months 12 days
Outstanding options, weighted average exercise price	$ 12.94
Number of exercisable options	174
Exercisable options, weighted average exercise price	$ 12.72

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)

-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 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)

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

Reference 2: 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.

+ Details

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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

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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

+ Details

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- Definition

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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