Basic and Diluted Net Loss Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income (numerator)
Net loss from continuing operations	$ (366)	$ (24,553)	$ (25,036)	$ (31,597)
Net loss from discontinued operations	(85)	(2,580)	(1,543)	(6,306)
Net loss	$ (451)	$ (27,133)	$ (26,579)	$ (37,903)
Shares (denominator)
Weighted-average basic common shares outstanding (in shares)	85,128,000	89,950,000	84,919,000	91,723,000
Weighted-average diluted common shares outstanding (in shares)	85,128,000	89,950,000	84,919,000	91,723,000
Basic and diluted net loss per share:
Basic net loss per share from continuing operations (dollars per share)	$ (0.01)	$ (0.27)	$ (0.29)	$ (0.34)
Basic net loss per share from discontinued operations (dollars per share)	$ 0.00	$ (0.03)	$ (0.02)	$ (0.07)
Basic net loss income per share (dollars per share)	$ (0.01)	$ (0.30)	$ (0.31)	$ (0.41)
Diluted net loss per share from continuing operations (dollars per share)	$ (0.01)	$ (0.27)	$ (0.29)	$ (0.34)
Diluted net loss per share from discontinued operations (dollars per share)	$ 0.00	$ (0.03)	$ (0.02)	$ (0.07)
Diluted net loss income per share (dollars per share)	$ (0.01)	$ (0.30)	$ (0.31)	$ (0.41)
Stock Option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities			3,351	3,884
Restricted Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities			5,091	5,216