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SELECTED QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details) (USD $)	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
SELECTED QUARTERLY FINANCIAL INFORMATION (UNAUDITED)
Revenues	$ 178,000us-gaap_Revenues	$ 160,000us-gaap_Revenues	$ 341,000us-gaap_Revenues	$ 474,000us-gaap_Revenues	$ 225,000us-gaap_Revenues	$ 181,000us-gaap_Revenues	$ 112,000us-gaap_Revenues	$ 765,000us-gaap_Revenues
Operating expenses	9,189,000us-gaap_OperatingExpenses	10,067,000us-gaap_OperatingExpenses	9,004,000us-gaap_OperatingExpenses	9,205,000us-gaap_OperatingExpenses	9,500,000us-gaap_OperatingExpenses	8,914,000us-gaap_OperatingExpenses	9,077,000us-gaap_OperatingExpenses	12,750,000us-gaap_OperatingExpenses	37,465,000us-gaap_OperatingExpenses	40,241,000us-gaap_OperatingExpenses	74,467,000us-gaap_OperatingExpenses
Net loss	(8,947,000)us-gaap_NetIncomeLoss	(9,549,000)us-gaap_NetIncomeLoss	(8,734,000)us-gaap_NetIncomeLoss	(8,440,000)us-gaap_NetIncomeLoss	(9,281,000)us-gaap_NetIncomeLoss	(8,254,000)us-gaap_NetIncomeLoss	(8,947,000)us-gaap_NetIncomeLoss	(11,897,000)us-gaap_NetIncomeLoss	(35,670,000)us-gaap_NetIncomeLoss	(38,379,000)us-gaap_NetIncomeLoss	(68,881,000)us-gaap_NetIncomeLoss
Basic and diluted net loss per share (in dollars per share)	$ (0.06)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.06)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.06)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.06)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.07)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.06)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.07)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.09)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.23)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.30)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.54)us-gaap_EarningsPerShareBasicAndDiluted
Restructuring charges					$ 430,000us-gaap_RestructuringCharges					$ 1,462,000us-gaap_RestructuringCharges	$ 2,702,000us-gaap_RestructuringCharges

X

- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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