CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME [Abstract]
Net loss	$ (11,073)	$ (12,263)	$ (20,386)	$ (23,521)
Other comprehensive income:
Net change in unrealized loss on auction rate securities	0	60	0	68
Total other comprehensive income	0	60	0	68
Comprehensive loss	$ (11,073)	$ (12,203)	$ (20,386)	$ (23,453)