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Summary Of Significant Accounting Policies - Revenue Recognition (Details) - USD ($)
$ in Thousands
 9 Months Ended
Jan. 01, 2018
Sep. 30, 2018
Accounts receivable    
Accounts receivable, Balance at Beginning of Period $ 679 $ 679
Accounts Receivable, Additions   1,189
Accounts Receivable, Deductions   (1,825)
Accounts receivable, Balance at End of Period   43
Contract liabilities, deferred Revenue:    
Deferred revenue, Balance at Beginning of Period (107,963) (107,963)
Deferred revenue, Additions   (9,986)
Deferred revenue, Deductions   5,124
Deferred revenue, Balance at End of Period   (112,825)
Effect of Change | ASU 2014-09    
Contract liabilities, deferred Revenue:    
Deferred revenue, Balance at Beginning of Period (107,963) $ (107,963)
Deferred revenue, Adjustments (474)  
Deferred revenue, Balance at End of Period $ (108,437)