STOCKHOLDERS' EQUITY - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 28, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 28, 2005
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		$ 1,701	$ 32,213	$ 576
Underwriting discounts and offering expenses	$ 2,800
Total purchase price		$ 34,149	87,524	75,110	34,149	$ 43,292
Other income (expense) related to liquidation of subsidiaries			$ (208)	$ 335	$ (10)
Stockholder Rights Plan [Member]
Class of Stock [Line Items]
Share purchase right (in shares)							1
Treasury Stock
Class of Stock [Line Items]
Treasury stock, outstanding (in shares)		(4,181,000)	(4,410,000)	(4,258,000)	(4,181,000)	(4,181,000)
Total purchase price		$ (37,986)	$ (38,640)	$ (38,083)	$ (37,986)	$ (37,986)
Foreign currency translation adjustments | Reclassification out of AOCI
Class of Stock [Line Items]
Other income (expense) related to liquidation of subsidiaries		$ 500