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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Summary of Significant Accounting Policies [Line Items]        
Number of shares excluded from the computation of net loss per share   32,696,757 23,159,206  
Foreign currency translation adjustment   $ 10,000   $ 9,100
Cost of government contracts revenue $ 2,700   $ 8,100  
Government Contract Receivable, Unbilled Amounts       900
Reclassified from Other Non-Current Assets to Restricted Cash       900
Restricted Cash and Cash Equivalents, Current   31,521   34,964
Security Deposit [Member]        
Summary of Significant Accounting Policies [Line Items]        
Restricted Cash and Cash Equivalents, Current   1,700   900
Grant Agreement [Member]        
Summary of Significant Accounting Policies [Line Items]        
Restricted Cash and Cash Equivalents, Current   $ 31,500   $ 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