EMPLOYEE BENEFIT PLAN (Details) (Employee 401(k) Plan, USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011 Y	Dec. 31, 2010	Dec. 31, 2009
Defined Contribution Plan
Employer matching contribution as a percentage of the employee's contribution	25.00%
Percentage of contribution vested each year	20.00%
Vesting period of contribution by the company (in years)	5
Matching contributions by the company	$ 0.5	$ 0.4	$ 0.3
Maximum
Defined Contribution Plan
Annual employee contribution limit as a percent of compensation	15.00%
Percent of employee's earnings eligible for employer matching contribution	8.00%

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The limit of annual employee contributions to the plan as a percent of compensation.

+ References

No definition available.

+ Details

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- Definition

Represents the employer matching contribution as a percentage of the employee's contribution towards the defined contribution plan.

+ References

No definition available.

+ Details

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- Definition

Percentage of employer's matching contributions to the defined contribution plan that vests in a given year.

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No definition available.

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- Definition

Represents the vesting period for matching contributions by the company.

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No definition available.

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- Definition

Represents the percent of employee's earnings eligible for employer matching contribution.

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No definition available.

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- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 11

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

+ Details

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