INCOME TAXES - Components of income tax expense (benefit) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current income tax expense (benefit):
Federal	$ 41	$ 37	$ 7
State	140	90	16
Foreign	33	38	38
Total current expense (benefit)	214	165	61
Deferred income tax expense (benefit)
Federal	560	977	(9)
State	46	79	(1)
Foreign
Total deferred expense (benefit)	606	1,056	(10)
Total income tax expense (benefit)	$ 820	$ 1,221	$ 51