COMMITMENTS AND CONTINGENCIES (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
COMMITMENTS AND CONTINGENCIES.
Restricted cash related to security deposit	$ 200,000	$ 200,000
Obligations for base rent and CAM costs under facility and other non-cancelable operating leases
2013	2,590,000
2014	2,303,000
2015	2,362,000
2016	2,374,000
2017	1,221,000
Total minimum lease payments	10,850,000
Total rent and CAM expense	$ 2,500,000	$ 2,500,000	$ 2,500,000