Stock-Based Compensation (Details 4) (USD $)	12 Months Ended
Dec. 31, 2012
Exercise prices range one [Member]
Additional Information regarding Options Outstanding
Range of Exercise Prices, Range 1	$ 2.70
Range of Exercise Prices, Range 2	$ 3.81
Number Outstanding	66,130
Weighted Average Remaining Contractual Life (Years)	5 years 5 months 12 days
Weighted Average Exercise Price	$ 2.82
Number Exercisable	63,091
Weighted Average Exercise Price	$ 2.81
Exercise prices range two [Member]
Additional Information regarding Options Outstanding
Range of Exercise Prices, Range 1	$ 3.85
Range of Exercise Prices, Range 2	$ 3.85
Number Outstanding	600,000
Weighted Average Remaining Contractual Life (Years)	6 years 10 months 13 days
Weighted Average Exercise Price	$ 3.85
Number Exercisable	475,000
Weighted Average Exercise Price	$ 3.85
Exercise prices range three [Member]
Additional Information regarding Options Outstanding
Range of Exercise Prices, Range 1	$ 4.03
Range of Exercise Prices, Range 2	$ 5.53
Number Outstanding	374,882
Weighted Average Remaining Contractual Life (Years)	5 years 9 months 22 days
Weighted Average Exercise Price	$ 5.01
Number Exercisable	255,010
Weighted Average Exercise Price	$ 4.88
Exercise prices range four [Member]
Additional Information regarding Options Outstanding
Range of Exercise Prices, Range 1	$ 5.58
Range of Exercise Prices, Range 2	$ 6.11
Number Outstanding	363,434
Weighted Average Remaining Contractual Life (Years)	4 years 11 months 27 days
Weighted Average Exercise Price	$ 5.81
Number Exercisable	299,309
Weighted Average Exercise Price	$ 5.85
Exercise prices range five [Member]
Additional Information regarding Options Outstanding
Range of Exercise Prices, Range 1	$ 6.12
Range of Exercise Prices, Range 2	$ 6.39
Number Outstanding	383,000
Weighted Average Remaining Contractual Life (Years)	6 years 6 months 18 days
Weighted Average Exercise Price	$ 6.20
Number Exercisable	17,000
Weighted Average Exercise Price	$ 6.23
Exercise prices range six [Member]
Additional Information regarding Options Outstanding
Range of Exercise Prices, Range 1	$ 6.41
Range of Exercise Prices, Range 2	$ 6.98
Number Outstanding	342,830
Weighted Average Remaining Contractual Life (Years)	4 years 11 months 27 days
Weighted Average Exercise Price	$ 6.77
Number Exercisable	266,227
Weighted Average Exercise Price	$ 6.82
Exercise prices range seven [Member]
Additional Information regarding Options Outstanding
Range of Exercise Prices, Range 1	$ 6.99
Range of Exercise Prices, Range 2	$ 8.18
Number Outstanding	328,527
Weighted Average Remaining Contractual Life (Years)	2 years 3 months 7 days
Weighted Average Exercise Price	$ 7.13
Number Exercisable	310,190
Weighted Average Exercise Price	$ 7.08
Exercise prices range eight [Member]
Additional Information regarding Options Outstanding
Range of Exercise Prices, Range 1	$ 8.61
Range of Exercise Prices, Range 2	$ 9.04
Number Outstanding	393,528
Weighted Average Remaining Contractual Life (Years)	4 years 11 days
Weighted Average Exercise Price	$ 8.80
Number Exercisable	393,528
Weighted Average Exercise Price	$ 8.80
Exercise prices range nine [Member]
Additional Information regarding Options Outstanding
Range of Exercise Prices, Range 1	$ 9.20
Range of Exercise Prices, Range 2	$ 15.12
Number Outstanding	203,300
Weighted Average Remaining Contractual Life (Years)	5 years 15 days
Weighted Average Exercise Price	$ 11.50
Number Exercisable	150,632
Weighted Average Exercise Price	$ 12.30
Exercise prices range ten [Member]
Additional Information regarding Options Outstanding
Range of Exercise Prices, Range 1	$ 16.57
Range of Exercise Prices, Range 2	$ 16.57
Number Outstanding	100,000
Weighted Average Remaining Contractual Life (Years)	4 years 8 months 27 days
Weighted Average Exercise Price	$ 16.57
Number Exercisable	100,000
Weighted Average Exercise Price	$ 16.57
Exercise prices range eleven [Member]
Additional Information regarding Options Outstanding
Range of Exercise Prices, Range 1	$ 2.70
Range of Exercise Prices, Range 2	$ 16.57
Number Outstanding	3,155,631
Weighted Average Remaining Contractual Life (Years)	5 years 2 months 27 days
Weighted Average Exercise Price	$ 6.65
Number Exercisable	2,329,987
Weighted Average Exercise Price	$ 6.91

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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

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-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 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.

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

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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.

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

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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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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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- 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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