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Geographic Information (Details) (USD $)
In Thousands, unless otherwise specified
 8 Months Ended 9 Months Ended 12 Months Ended 209 Months Ended
Mar. 31, 1997
Dec. 31, 2003
Dec. 31, 2013
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, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]                                      
Revenue     $ 1,084 $ 69                             $ 7,901
Net loss (290) (14,977) (10,153) (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) (276,888)
Assets     35,520 19,354                             35,520
Long Lived Assets, net     275 129                             275
United States
                                      
Revenues from External Customers and Long-Lived Assets [Line Items]                                      
Net loss     1,171 (1,102) (75)                            
Assets     28,548 15,500                             28,548
Long Lived Assets, net     5 25                             5
United States | Continuing operations
                                      
Revenues from External Customers and Long-Lived Assets [Line Items]                                      
Net loss     1,114 (1,672) 565                            
Assets     27,837 14,286                             27,837
Long Lived Assets, net     5 25                             5
United States | Discontinued operations
                                      
Revenues from External Customers and Long-Lived Assets [Line Items]                                      
Net loss     57 570 (640)                            
Assets     711 1,214                             711
Long Lived Assets, net                                         
United Kingdom
                                      
Revenues from External Customers and Long-Lived Assets [Line Items]                                      
Revenue     1,084 69                               
Net loss     (11,324) (12,084) (15,168)                            
Assets     6,972 3,854                             6,972
Long Lived Assets, net     $ 270 $ 104                             $ 270