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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Summary of Significant Accounting Policies [Line Items]      
Number of shares excluded from the computation of net loss per share 39,277,732 23,832,545 16,978,098
Foreign currency translation adjustment $ 11,800 $ 9,100  
Government Contract Receivable, Unbilled Amounts   900  
Restricted Cash and Cash Equivalents 30,314 34,964  
Reclassification Of Current Deferred Rent To Other Current Liabilities   1,400  
Reclassification Of Non-Current Deferred Rent To Other Non-Current Liabilities 900 9,500  
Security Deposit [Member]      
Summary of Significant Accounting Policies [Line Items]      
Restricted Cash and Cash Equivalents 1,700 900  
Grant Agreement [Member]      
Summary of Significant Accounting Policies [Line Items]      
Restricted Cash and Cash Equivalents $ 33,200 $ 36,500  
Convertible Debt Securities [Member]      
Summary of Significant Accounting Policies [Line Items]      
Number of shares excluded from the computation of net loss per share 47,716,900