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Revenue - Disaggregated by Timing of Recognition (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Disaggregation of Revenue    
Revenue $ 10,765 $ 25,618
Point in time    
Disaggregation of Revenue    
Revenue 9,644 24,116
Over time    
Disaggregation of Revenue    
Revenue $ 1,121 $ 1,502