Condensed Consolidated Statements of Changes in Stockholders' Equity - 3 months ended Mar. 31, 2016 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Balances at Dec. 31, 2015	$ 421,476	$ 1,513	$ 3,024,461	$ (2,600,776)	$ (3,722)
Balances, in shares at Dec. 31, 2015		151,339
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(20,396)	$ 0	0	(20,396)	0
Other comprehensive income (loss)	1,631	$ 0	0	0	1,631
Common stock issued under stock-based compensation plans, net (in shares)		1,901
Common stock issued under stock-based compensation plans, net	2,429	$ 19	2,410	0	0
Balances at Mar. 31, 2016	$ 405,140	$ 1,532	$ 3,026,871	$ (2,621,172)	$ (2,091)
Balances, in shares at Mar. 31, 2016		153,240