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Geographic Information (Details) (USD $) In Thousands, unless otherwise specified | 8 Months Ended | 9 Months Ended | 12 Months Ended | 185 Months Ended | 194 Months Ended | 197 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 1997 | Dec. 31, 2003 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2008 | Dec. 31, 2007 | Dec. 31, 2006 | Dec. 31, 2005 | Dec. 31, 2004 | Mar. 31, 2003 | Mar. 31, 2002 | Mar. 31, 2001 | Mar. 31, 2000 | Mar. 31, 1999 | Mar. 31, 1998 | Dec. 31, 2011 | Sep. 30, 2012 | Dec. 31, 2012
Geographic information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  | $ 69 |  | $ 112 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,817
Net loss | (290) | (14,977) | (13,186) | (15,243) | (16,021) | (19,570) | (40,386) | (24,053) | (29,258) | (18,048) | (22,742) | (15,542) | (14,853) | (10,382) | (5,686) | (3,964) | (2,534) | (253,549) | (261,971) | (266,735)
Total Assets |  |  | 19,354 | 25,998 |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,998 |  | 19,354
Long Lived Assets, net |  |  | 129 | 167 | 167 |  |  |  |  |  |  |  |  |  |  |  |  | 167 |  | 129
United States |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Geographic information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  | (1,102) | (75) | (4,662) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  |  | 15,500 | 20,715 |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,715 |  | 15,500
Long Lived Assets, net |  |  | 25 | 45 |  |  |  |  |  |  |  |  |  |  |  |  |  | 45 |  | 25
United States | Continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Geographic information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  | (1,672) | 565 | (3,531) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  |  | 14,286 | 20,402 |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,402 |  | 14,286
Long Lived Assets, net |  |  | 25 | 45 |  |  |  |  |  |  |  |  |  |  |  |  |  | 45 |  | 25
United States | Discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Geographic information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  | 570 | (640) | (1,131) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  |  | 1,214 | 313 |  |  |  |  |  |  |  |  |  |  |  |  |  | 313 |  | 1,214
United Kingdom |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Geographic information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  | 69 |  | 112 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  | (12,084) | (15,168) | (11,359) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  |  | 3,854 | 5,283 |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,283 |  | 3,854
Long Lived Assets, net |  |  | $ 104 | $ 122 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 122 |  | $ 104

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