STOCKHOLDERS' EQUITY (Details) (Stock options, USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stockholders' equity
Shares issued from exercise of options	823,331	658,510	155,935
Exercise price (in dollars per share)	$ 0.86	$ 1.27	$ 0.79
Minimum
Stockholders' equity
Exercise price (in dollars per share)	$ 0.51	$ 0.51	$ 0.51
Maximum
Stockholders' equity
Exercise price (in dollars per share)	$ 3.07	$ 2.42	$ 2.42