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Summary of Significant Accounting Policies (Cash and Equivalents) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 119,948 $ 93,108 $ 138,144 $ 32,335
Cash [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 8,325 29,569    
Money market funds [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 89,623 14,950    
Government-backed security [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 22,000 20,000    
Asset-backed Securities [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 0 8,185    
Corporate debt securities [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 0 $ 20,404