Condensed Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Balances at Dec. 31, 2014	$ 585,318	$ 1,034	$ 2,789,695	$ (2,202,603)	$ (2,808)
Balances, in shares at Dec. 31, 2014		103,384
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(33,287)	0	0	(33,287)	0
Other comprehensive loss	13	0	0	0	13
Common stock issued under stock-based compensation plans, net	1,520	(1)	1,521	0	0
Common stock issued under stock-based compensation plans, net		(85)
Balances at Mar. 31, 2015	$ 553,564	$ 1,033	$ 2,791,216	$ (2,235,890)	$ (2,795)
Balances, in shares at Mar. 31, 2015		103,299