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Contingencies (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Loss Contingency [Abstract]      
Balance as of December 31, 2017 $ 349 $ 969 $ 388
Product warranty charges/adjustments 1,256 (149) 1,285
Payments and settlements (88) (471) (704)
Balance as of June 30, 2018 $ 1,517 $ 349 $ 969