Capitalization (Details 3) (USD $)	9 Months Ended
Sep. 30, 2012
Stock Plans
Outstanding options (in shares)	107,875
Weighted average exercise price (in dollars per share)	7.34
2005 Incentive Award Plan \| Stock options
Stock Plans
Percentage of options exercisable and expire during 2011	25.00%
Percentage of options exercisable and expire during 2012	25.00%
Percentage of options exercisable and expire during 2013	50.00%
Exercisable period after the date of grant for the grants made in 2008 and thereafter	1 year
2005 Incentive Award Plan \| Stock options \| Maximum
Stock Plans
Term of options	10 years
2005 Incentive Award Plan \| Stock options \| Non-employee director
Stock Plans
Options automatically granted on becoming a director and upon each reelection (in shares)	5,000
2005 Incentive Award Plan \| Stock options \| Independent members of the board of directors
Stock Plans
Outstanding options (in shares)	107,875
Weighted average exercise price (in dollars per share)	7.34

The period of time in which the equity-based award expires.

No definition available.

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- Definition

Represents the number of options automatically granted on the date a person becomes a director and upon each reelection as a director.

+ References

No definition available.

+ Details

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- Definition

Represents the percentage of options exercisable and expiring during 2011.

+ References

No definition available.

+ Details

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- Definition

Represents the percentage of options exercisable and expiring during 2012.

+ References

No definition available.

+ Details

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- Definition

Represents the percentage of options exercisable and expiring during 2013.

+ References

No definition available.

+ Details

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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 number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

+ 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)(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.

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 2

-Subparagraph (c)(1)(i)-(ii)

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

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(a)

-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 price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ 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)

-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)

-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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