COMMITMENTS AND CONTINGENCIES (Details) (USD $)	12 Months Ended
	Dec. 31, 2012 item	Dec. 31, 2011	Dec. 31, 2010
COMMITMENTS AND CONTINGENCIES
Number of two year extension options	1
Lease extension period	2 years
Future minimum payments under operating leases for the year ended December 31, 2013	$ 1,415,000
Future minimum payments under operating leases for the year ended December 31, 2014	779,000
Rent expense under operating leases	$ 1,474,000	$ 1,311,000	$ 1,323,000
Severance Plan
COMMITMENTS AND CONTINGENCIES
Period within which employee is terminated by entity without cause following a change of control	12 months
Period within which no comparable employment is offered by the entity following a change of control	30 days
Period within which employee resigns following a change of control due to material change in terms of employment	6 months
Severance Plan | Minimum
COMMITMENTS AND CONTINGENCIES
Period of base salary to be considered for severance payments	2 months
Severance Plan | Maximum
COMMITMENTS AND CONTINGENCIES
Period of base salary to be considered for severance payments	18 months