Supplementary Financial Data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Supplementary Financial Data
Total revenue	$ 7,280us-gaap_Revenues	$ 999us-gaap_Revenues	$ 934us-gaap_Revenues	$ (780)us-gaap_Revenues	$ 1,473us-gaap_Revenues	$ 415us-gaap_Revenues	$ 1,322us-gaap_Revenues	$ 1,322us-gaap_Revenues	$ 8,433us-gaap_Revenues	$ 4,532us-gaap_Revenues	$ 5,613us-gaap_Revenues
Operating expenses	(7,150)us-gaap_OperatingExpenses	(10,541)us-gaap_OperatingExpenses	(10,728)us-gaap_OperatingExpenses	(13,943)us-gaap_OperatingExpenses	(8,890)us-gaap_OperatingExpenses	(8,122)us-gaap_OperatingExpenses	(8,220)us-gaap_OperatingExpenses	(8,095)us-gaap_OperatingExpenses	(42,362)us-gaap_OperatingExpenses	(33,327)us-gaap_OperatingExpenses	(30,759)us-gaap_OperatingExpenses
Loss from continuing operations, net of tax	(15,926)	(21,271)	(20,151)	(16,182)	(8,894)	(9,454)	(1,541)	(10,746)	(73,530)	(30,633)	(30,689)
Loss from discontinued operations	0	0	(43,413)	(51,521)	(41,035)	(37,531)	(34,888)	(26,614)	(94,934)	(140,068)	12,147
Net loss	$ (15,926)	$ (21,271)	$ (63,564)	$ (67,703)	$ (49,929)	$ (46,985)	$ (36,429)	$ (37,360)	$ (168,464)	$ (170,701)	$ (18,542)
Basic and diluted net loss per common share:
Continuing operations, net of tax	$ (0.14)	$ (0.19)	$ (0.18)	$ (0.15)	$ (0.08)	$ (0.09)	$ (0.02)	$ (0.11)	$ (0.66)	$ (0.30)	$ (0.34)
Discontinued operations	$ 0.00	$ 0.00	$ (0.39)	$ (0.47)	$ (0.38)	$ (0.35)	$ (0.35)	$ (0.28)	$ (0.84)	$ (1.37)	$ 0.14
Basic and diluted net loss per common share (in dollars per share)	$ (0.14)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.19)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.57)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.62)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.46)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.44)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.37)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.39)us-gaap_EarningsPerShareBasicAndDiluted	$ (1.50)us-gaap_EarningsPerShareBasicAndDiluted	$ (1.67)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.20)us-gaap_EarningsPerShareBasicAndDiluted
Cash dividends declared per common share	$ 0.25	$ 0.25	$ 0	$ 0					$ 0.50	$ 0.00	$ 0.00

Aggregate dividends declared during the period for each share of common stock outstanding.

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