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EMPLOYEE 401(K) PLAN (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Defined Contribution Plan [Line Items] |  |  |
Employer matching contribution (in percent) | 50.00% |  |
Maximum employee annual salary contribution (in percent) | 15.00% |  |
Maximum employee annual salary contribution amount | $ 0 |  |
Employer contribution | $ 0.3 | $ 0.2 | $ 0.2
Maximum [Member] |  |  |
Defined Contribution Plan [Line Items] |  |  |
Maximum annual contribution per employee (in percent) | 6.00% |  |

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