INCOME TAXES - Summary of current and deferred income tax provision (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
Federal		$ 12	$ 194
State	165	140	351
Foreign
Total current income tax provision	165	152	545
Deferred:
Federal		(6,002)
State			1
Foreign	288	238	406
Total deferred income tax provision	288	(5,764)	407
Net income tax provision (benefit)	$ 453	$ (5,612)	$ 952