CASH AND CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010
CASH AND CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS
Cash and cash equivalents	$ 8,136	$ 13,340	$ 10,204	$ 15,331
Cash
CASH AND CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS
Cash and cash equivalents	7,426	11,127
Certificates of deposits
CASH AND CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS
Cash and cash equivalents	710	707
Municipal bonds
CASH AND CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS
Cash and cash equivalents		$ 1,506