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Revenue - Disaggregation of Revenue - Expected Timing Of Satisfaction Period (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, remaining performance obligation, amount $ 4,334 $ 18,336
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, remaining performance obligation, amount $ 2,664  
Revenue, remaining performance obligation, expected timing of satisfaction, period 12 months  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, remaining performance obligation, amount $ 529  
Revenue, remaining performance obligation, expected timing of satisfaction, period 24 months