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Merger with Nuvelo, Inc. on January 27, 2009 (Details) (USD $)
 1 Months Ended 3 Months Ended 6 Months Ended 126 Months Ended
Jan. 27, 2009
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Merger with Nuvelo, Inc. On January 27, 2009 (Textual) [Abstract]            
Estimated total acquisition consideration $ 11,900,000          
Net assets acquired in the Merger 37,200,000          
Net assets acquired, including cash, cash equivalents and marketable Securities 45,500,000          
Gain on bargain purchase $ 25,300,000             $ 25,282,000