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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

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- 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. + References No definition available. + Details
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.18) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.22) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 + Details
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