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INCOME TAXES - Reconciliation between the U.S. federal statutory rate and the effective tax rate (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Disclosure [Abstract]      
Income tax (benefit) expense at statutory rate $ (3,696) $ (3,659) $ (10,430)
State tax (benefit) expense, net of Federal tax (benefit) expense (449) 357 (559)
Permanent items 648 617 116
Effect of change in valuation allowance and State NOL expiration 3,190 3,737 11,586
Tax credits 320 (2,006) (1,466)
Other (13) 954 203
Tax expense (benefit)     $ (550)