STOCKHOLDERS' EQUITY - Narrative (Details) (USD $)	1 Months Ended	12 Months Ended			3 Months Ended
	Feb. 28, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2011
Class of Stock [Line Items]
Shares issued in connection with public offering, net of offering costs (in shares)	14,100,000
Price per share (in usd per share)	$ 2.45
Proceeds from issuance of common stock, net	$ 31,700,000	$ 32,213,000	$ 576,000	$ 366,000
Underwriting discounts and offering expenses	2,800,000
Total purchase price		75,110,000	34,149,000	43,292,000	34,149,000	60,145,000
Other income (expense) related to liquidation of subsidiaries		335,000	(10,000)	316,000
Percentage of one preferred stock to purchase of each Right		0.001
Exercise price of each Right (in usd per share)		$ 55.00
Percentage of common stock acquired by a person or group for share purchase right to become exercisable		15.00%
Redemption price of each Right (in usd per share)		$ 0.001
Number of common stock in exchange of each Right		1
Discount of rights to purchase common stock of acquiror		50.00%
Share purchase rights outstanding (in shares)		50,000,000
Treasury Stock
Class of Stock [Line Items]
Treasury stock, outstanding (in shares)		(4,258,000)	(4,181,000)	(4,181,000)	(4,181,000)	(4,181,000)
Total purchase price		(38,083,000)	(37,986,000)	(37,986,000)	(37,986,000)	(37,986,000)
Reclassification out of AOCI | Foreign currency translation adjustments
Class of Stock [Line Items]
Other income (expense) related to liquidation of subsidiaries					$ 500,000