SHAREHOLDERS' EQUITY (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended		9 Months Ended
	May 31, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
SHAREHOLDERS' EQUITY
Options exercised during period (in shares)		248,846	167,323	436,627	470,239
Net proceeds from options exercised during the period		$ 1.2	$ 0.4	$ 1.8	$ 1.4
Shares sold under ESPP	104,765
Weighted average purchase price of shares sold under ESPP (in dollars per share)	$ 4.30
Proceeds from shares sold under the ESPP	$ 0.5