CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME [Abstract]
Net loss	$ (10,500)	$ (11,301)	$ (34,021)	$ (35,107)
Other comprehensive income:
Net change in unrealized loss on auction rate securities	0	0	68	8
Total other comprehensive income	0	0	68	8
Comprehensive loss	$ (10,500)	$ (11,301)	$ (33,953)	$ (35,099)