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Revenue Deferred Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Revenue Recognition and Deferred Revenue [Abstract]    
Deferred revenue $ 3,401 $ 4,095
Deferred Revenue, Revenue Recognized 1,017  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period 1 $ 578