Quarterly report pursuant to Section 13 or 15(d)

Description of Business (Details)

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Description of Business (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
[1]
Jun. 30, 2014
Dec. 31, 2013
Description of Business [Abstract]        
Accumulated deficit incurred $ (1,164,954) $ (1,119,477)    
Cash and cash equivalents $ 50,957 $ 78,445 $ 65,895 $ 101,659
[1] The condensed consolidated balance sheet as of December 31, 2014 has been derived from the audited consolidated financial statements as of that date included in the Company's Annual Report on Form 10-K for the year ended December 31, 2014.