SUBSEQUENT EVENT (Details) (USD $) In Thousands, except Share data in Millions, unless otherwise specified	1 Months Ended	12 Months Ended
	Feb. 28, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Subsequent Event [Line Items]
Shares issued in connection with public offering, net of offering costs (in shares)	14.1
Proceeds from issuance of common stock, net	$ 31,700	$ 32,213	$ 576	$ 366