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Revenue - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]    
Contract with customer, liability $ 9,324 $ 4,095
Deferred revenue, revenue recognized 1,017  
Cumulative catch-up adjustment to revenue, modification of contract 2,500  
Revenue, remaining performance obligation $ 578