Stock-Based Compensation (Details Textual) (USD $)	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Stock-Based Compensation (Additional Textual) [Abstract]
Number of options for every share issued	1.75
Discount from fair market value on purchase date	85.00%
Maximum number of shares per employee	2,000
Employee stock purchase plan offering period	6 months
Maximum value of shares per employee	$ 25,000
Common stock reserved for issuance	1,000,000
Shares purchased by employee since inception of ESPP	498,522
Shares purchased under ESPP	16,003	10,656
Unrecognized compensation cost	8,900,000
Stock repurchase program, authorized amount	$ 50,000,000
Repurchased shares	0	0
Stock Options [Member]
Stock-Based Compensation (Textual) [Abstract]
Stock-based payment award vesting period (years)	4 years
Unrecognized compensation cost, recognized over an estimated weighted-average period (years)	3 years 7 months 24 days
Stock Options [Member] \| Maximum [Member]
Stock-Based Compensation (Textual) [Abstract]
Stock-based payment award expiration period (years)	10 years
Stock Options [Member] \| Minimum [Member]
Stock-Based Compensation (Textual) [Abstract]
Stock-based payment award expiration period (years)	5 years
Restricted Stock Awards [Member]
Stock-Based Compensation (Textual) [Abstract]
Stock-based payment award vesting period (years)	1 year
Unrecognized compensation cost, recognized over an estimated weighted-average period (years)	2 months 1 day
Restricted Stock Units [Member]
Stock-Based Compensation (Textual) [Abstract]
Stock-based payment award vesting period (years)	3 years
Unrecognized compensation cost, recognized over an estimated weighted-average period (years)	2 years 3 months 22 days

Number of shares that have been repurchased during the period and are held in the treasury.

No definition available.

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options reduction in shares available for grant for every share issued.

+ References

No definition available.

+ Details

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- Definition

Share based compensation arrangement by share based payment award expiration period.

+ References

No definition available.

+ Details

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- Definition

The highest value of shares that an employee can purchase under the plan per period.

+ References

No definition available.

+ Details

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- Definition

Share based compensation arrangement by share-based payment award offering period.

+ References

No definition available.

+ Details

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- Definition

Shares purchased by employee since inception of employee stock purchase plan ("ESPP").

+ References

No definition available.

+ Details

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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 4

-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 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

+ 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 (i)

-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 h

-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

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

The discount rate from market value on purchase date that participants pay for shares.

+ 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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- Definition

The highest quantity of shares an employee can purchase under the plan per period.

+ References

+ Details

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- Definition

The number of shares purchased on the open market during the period for issuance to employees under the plan.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-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

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

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64, 65

-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 amount authorized by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

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