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Composition Of Certain Financial Statement Captions Composition Of Certain Financial Statement Captions - Other Income and Expense, Net (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation of Revenue [Line Items]        
Interest income from investments $ 214 $ 249 $ 464 $ 463
Other income (losses) (133) (29) 620 (197)
Other income and expense, net 2,229 220 5,383 266
Financing        
Disaggregation of Revenue [Line Items]        
Interest income from significant financing components under Topic 606 $ 2,148 $ 0 $ 4,299 $ 0