SUBSEQUENT EVENT (Details) (Subsequent Event, USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended
	Feb. 03, 2014	Feb. 11, 2014 Series A 3% Redeemable Convertible Preferred Stock
Subsequent Event [Line Items]
Business acquisition, share price in merger consideration	$ 48.25
Percentage of target number of shares covered by award (less than one-third)	33.33%
Termination fee	$ 54.9
Maximum number of shares of common stock upon conversion		5,805,921