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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Summary of Significant Accounting Policies [Line Items]      
Number of shares excluded from the computation of net loss per share 23,832,545 16,978,098 11,992,918
Foreign currency translation adjustment $ 9,100 $ 6,500  
Restricted Cash and Cash Equivalents, Noncurrent $ 1,537 0  
Cost of government contracts revenue   $ 15,000 $ 8,200